Pub Date : 2020-05-18DOI: 10.11648/J.AJCE.20200803.11
Ziying Liu, Tianlai Yu
The temperature field of concrete box girder under sunshine is an important factor to be considered in the design of bridge superstructure. Based on the meteorological parameters and the semi-empirical formula given by related bridge specifications, the vertical temperature gradient distribution model of prestressed concrete box girder was established using SPSS software. The amplitude of the temperature gradient model is calculated according to the theory of statistics. The index function model considering wind speed, solar radiation and temperature variation was obtained, and the method to determine the amplitude of vertical temperature gradient was summarized according to different building climate zones in China. The applicable conditions of the model are as follows: sunny and cloudless days with high radiation quantity should be selected; The selected months are generally from May to July, and June in extremely cold regions. It is verified that the calculated value fits well with the measured value by monitoring data of 3 real Bridges in different zones. The model of temperature gradient heating in warm areas was calculated. For the temperate climate regions without real bridge measured data, the recommended value of temperature gradient amplitude in this region is given after trial calculation. It explores the method of using only meteorological data without surveying and mapping, which can save a lot of manpower and material resources.
{"title":"Model for Vertical Hyperthermic Temperature Gradient Distribution in Concrete Box Girder in China","authors":"Ziying Liu, Tianlai Yu","doi":"10.11648/J.AJCE.20200803.11","DOIUrl":"https://doi.org/10.11648/J.AJCE.20200803.11","url":null,"abstract":"The temperature field of concrete box girder under sunshine is an important factor to be considered in the design of bridge superstructure. Based on the meteorological parameters and the semi-empirical formula given by related bridge specifications, the vertical temperature gradient distribution model of prestressed concrete box girder was established using SPSS software. The amplitude of the temperature gradient model is calculated according to the theory of statistics. The index function model considering wind speed, solar radiation and temperature variation was obtained, and the method to determine the amplitude of vertical temperature gradient was summarized according to different building climate zones in China. The applicable conditions of the model are as follows: sunny and cloudless days with high radiation quantity should be selected; The selected months are generally from May to July, and June in extremely cold regions. It is verified that the calculated value fits well with the measured value by monitoring data of 3 real Bridges in different zones. The model of temperature gradient heating in warm areas was calculated. For the temperate climate regions without real bridge measured data, the recommended value of temperature gradient amplitude in this region is given after trial calculation. It explores the method of using only meteorological data without surveying and mapping, which can save a lot of manpower and material resources.","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"44 1","pages":"48"},"PeriodicalIF":0.0,"publicationDate":"2020-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86079736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-04-23DOI: 10.11648/J.AJCE.20200802.11
Gemechu Abdissa
The beam column connection is the most critical zone in a reinforced concrete frame. The strength of connection affects the overall behavior and performance of RC framed structures subjected to lateral load and axial loads. The study of critical parameters that affects the overall joint performances and response of the structure is important. Recent developments in computer technology have made possible the use of Finite element method for 3D modeling and analysis of reinforced concrete structures. Nonlinear finite element analysis of reinforced concrete interior beam column connection subjected to lateral loading was performed in order to investigate joint shear failure mode in terms of joint shear capacity, deformations and cracking pattern using ABAQUS software. A 3D solid shape model using 3D stress hexahedral element type (C3D8R) was implemented to simulate concrete behavior. Wire shape model with truss shape elements (T3D2) was used to simulate reinforcement’s behavior. The concrete and reinforcement bars were coupled using the embedded modeling technique. In order to define nonlinear behavior of concrete material, the concrete damage plasticity (CDP) was applied to the numerical model as a distributed plasticity over the whole geometry. The study was to investigate the most influential parameters affecting joint shear failure due to column axial load, beam longitudinal reinforcement ratio, joint panel geometry and concrete compressive strength. The Finite Element Model (FEM) was verified against experimental test of interior RC beam column connection subjected to lateral loading. The model showed good comparison with test results in terms of load-displacement relation, cracking pattern and joint shear failure modes. The FEA clarified that the main influential parameter for predicting joint shear failure was concrete compressive strength.
{"title":"Finite Element Analysis of Reinforced Concrete Interior Beam Column Connection Subjected to Lateral Loading","authors":"Gemechu Abdissa","doi":"10.11648/J.AJCE.20200802.11","DOIUrl":"https://doi.org/10.11648/J.AJCE.20200802.11","url":null,"abstract":"The beam column connection is the most critical zone in a reinforced concrete frame. The strength of connection affects the overall behavior and performance of RC framed structures subjected to lateral load and axial loads. The study of critical parameters that affects the overall joint performances and response of the structure is important. Recent developments in computer technology have made possible the use of Finite element method for 3D modeling and analysis of reinforced concrete structures. Nonlinear finite element analysis of reinforced concrete interior beam column connection subjected to lateral loading was performed in order to investigate joint shear failure mode in terms of joint shear capacity, deformations and cracking pattern using ABAQUS software. A 3D solid shape model using 3D stress hexahedral element type (C3D8R) was implemented to simulate concrete behavior. Wire shape model with truss shape elements (T3D2) was used to simulate reinforcement’s behavior. The concrete and reinforcement bars were coupled using the embedded modeling technique. In order to define nonlinear behavior of concrete material, the concrete damage plasticity (CDP) was applied to the numerical model as a distributed plasticity over the whole geometry. The study was to investigate the most influential parameters affecting joint shear failure due to column axial load, beam longitudinal reinforcement ratio, joint panel geometry and concrete compressive strength. The Finite Element Model (FEM) was verified against experimental test of interior RC beam column connection subjected to lateral loading. The model showed good comparison with test results in terms of load-displacement relation, cracking pattern and joint shear failure modes. The FEA clarified that the main influential parameter for predicting joint shear failure was concrete compressive strength.","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"402 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76532424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-04-23DOI: 10.11648/J.AJCE.20200802.12
Shijie Wang, Quansheng Sun, Hong-Wei Gao, H. Xia
According to similar criteria, the on-site lattice support on-site in the typhoon area is 62m high and scaled down at 1: 150 to produce an aeroelastic scaled model of the lattice support. Based on the specifications and the characteristics of the wind field in the area where the project is located, a type A landform is used for wind tunnel tests. Through the measured structural dynamic characteristics combined with the help of the finite element analysis software Ansys, the dynamic characteristics of the lattice support under typhoon wind field were studied. The test results showed that under wind load, the lattice support itself is dominated by second-order low-frequency vibrations. The top end of the bracket is excited with a lower first-order frequency. The difference between the first-order and second-order natural frequencies is small. The support is about H / 3 height or more, which is greatly affected by wind load and speed, and is less affected below 30m; at each wind direction angle, the acceleration response of each measurement point of the support generally increases non-linearly with the increase of wind speed. The response of the measuring point shows a quadratic curve relationship with the wind speed. The acceleration of the measuring point gradually decreases from the top to the bottom. At the same wind speed, the closer to the top, the larger the acceleration. The positive change is more than H / 2, and the change period is unstable. Below 20m, the positive and negative acceleration changes relatively uniformly, the closer to the bottom, the smaller the acceleration period; the maximum value of the wind vibration response at each measurement point occurs under the wind angle of 0 ° and 90 °, the wind resistance generated by the box girder cross section has little effect on the support; at a wind angle of 45 °, the response value of the crosswind and windward wind vibration is similar, and the effect of the crosswind cannot be ignored.
{"title":"Dynamic Characteristics Analysis of High Pier Steel Pipe Lattice Support System in Typhoon Region","authors":"Shijie Wang, Quansheng Sun, Hong-Wei Gao, H. Xia","doi":"10.11648/J.AJCE.20200802.12","DOIUrl":"https://doi.org/10.11648/J.AJCE.20200802.12","url":null,"abstract":"According to similar criteria, the on-site lattice support on-site in the typhoon area is 62m high and scaled down at 1: 150 to produce an aeroelastic scaled model of the lattice support. Based on the specifications and the characteristics of the wind field in the area where the project is located, a type A landform is used for wind tunnel tests. Through the measured structural dynamic characteristics combined with the help of the finite element analysis software Ansys, the dynamic characteristics of the lattice support under typhoon wind field were studied. The test results showed that under wind load, the lattice support itself is dominated by second-order low-frequency vibrations. The top end of the bracket is excited with a lower first-order frequency. The difference between the first-order and second-order natural frequencies is small. The support is about H / 3 height or more, which is greatly affected by wind load and speed, and is less affected below 30m; at each wind direction angle, the acceleration response of each measurement point of the support generally increases non-linearly with the increase of wind speed. The response of the measuring point shows a quadratic curve relationship with the wind speed. The acceleration of the measuring point gradually decreases from the top to the bottom. At the same wind speed, the closer to the top, the larger the acceleration. The positive change is more than H / 2, and the change period is unstable. Below 20m, the positive and negative acceleration changes relatively uniformly, the closer to the bottom, the smaller the acceleration period; the maximum value of the wind vibration response at each measurement point occurs under the wind angle of 0 ° and 90 °, the wind resistance generated by the box girder cross section has little effect on the support; at a wind angle of 45 °, the response value of the crosswind and windward wind vibration is similar, and the effect of the crosswind cannot be ignored.","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"38 1","pages":"30"},"PeriodicalIF":0.0,"publicationDate":"2020-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73183077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-03DOI: 10.11648/J.AJCE.20200801.12
E. Strepelias, N. Stathas, X. Palios, S. Bousias
The design of complicated structures which, under accidental actions, have to fulfill a certain performance level, has been a scientific challenge with social and economic implications, particularly in the field of earthquake engineering. Experimental testing on structures would shed light to the deriving issues, however the full-scaling requirements of the specimens and the most out of date existing laboratory facilities do not facilitate it. For that reason, it is generally proposed the testing structure to be decomposed in its components and the part of scientific interest can be laboratory tested, whereas the other substructures are analytically modelled. That approach is known as hybrid simulation method (HS) and lends itself as an efficient tool in unveiling the nonlinear response of structural systems, especially when testing in full-scale is sought. The present research aims to evaluate the technical aspects of implementing a robust, advanced hybrid simulation (HS) platform, based on technological advancements and combining user friendliness and effectiveness. In addition, the capabilities of the advanced platform pave the way to future research extensions towards studying multi-physics problems beyond the field of earthquake engineering. The good performance of the updated hardware configuration of the new platform was evaluated via a series of verification tests on a pinned steel cantilever column subjected to lateral loading in its elastic and inelastic response region and finally, making use of the advanced application platform as a whole, a hybrid simulation test was carried out on an industrial piping system under earthquake excitation.
{"title":"Hybrid Simulation Framework for Multi-hazard Testing","authors":"E. Strepelias, N. Stathas, X. Palios, S. Bousias","doi":"10.11648/J.AJCE.20200801.12","DOIUrl":"https://doi.org/10.11648/J.AJCE.20200801.12","url":null,"abstract":"The design of complicated structures which, under accidental actions, have to fulfill a certain performance level, has been a scientific challenge with social and economic implications, particularly in the field of earthquake engineering. Experimental testing on structures would shed light to the deriving issues, however the full-scaling requirements of the specimens and the most out of date existing laboratory facilities do not facilitate it. For that reason, it is generally proposed the testing structure to be decomposed in its components and the part of scientific interest can be laboratory tested, whereas the other substructures are analytically modelled. That approach is known as hybrid simulation method (HS) and lends itself as an efficient tool in unveiling the nonlinear response of structural systems, especially when testing in full-scale is sought. The present research aims to evaluate the technical aspects of implementing a robust, advanced hybrid simulation (HS) platform, based on technological advancements and combining user friendliness and effectiveness. In addition, the capabilities of the advanced platform pave the way to future research extensions towards studying multi-physics problems beyond the field of earthquake engineering. The good performance of the updated hardware configuration of the new platform was evaluated via a series of verification tests on a pinned steel cantilever column subjected to lateral loading in its elastic and inelastic response region and finally, making use of the advanced application platform as a whole, a hybrid simulation test was carried out on an industrial piping system under earthquake excitation.","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"13 1","pages":"10"},"PeriodicalIF":0.0,"publicationDate":"2020-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85785745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-18DOI: 10.11648/J.AJCE.20200801.11
Hye Jung Kim, Nam Wook Kim
Hybrid fiber reinforcement with both macro and micro steel fibers in the concrete matrix is applied in order to evaluate its effectiveness for crack arresting. One of the main objectives of this research is to establish a crack-free high performance concrete. In severe conditions, which may require high water tightness, such as a storage structure for low-level radioactive waste, crack-free high performance concrete structures could be applied. Hybrid fiber reinforcement is well known because it can show excellent performance with a suitable combination of fibers. In this study which deals with hybrid fiber reinforced concrete made with different fiber lengths and fiber contents, the factors which quantify crack resistance of concrete, mainly the first crack strength, flexural strength and strain energy release rate are examined. In this research, the crack resistance of concrete was investigated using the notched specimen by the 4-point bending test for the fiber reinforced concrete and hybrid fiber reinforced concrete (adding the macro and micro fibers). The general conclusions obtained are as follows. To the investigation of the crack resistance of concrete, we obtained the new theoretical equation of the critical strain energy release rate for the hybrid fiber reinforced concrete, and a deep correlation between experimental value and theoretical value was shown. Though in this research, total fiber contents 2.5% showed the maximum values in the strength and crack resistance, an investigation of the totally mechanical behavior needs more widely range of experiment.
{"title":"Enhancement of Mechanical Property of Concrete Structure Using the Macro and Micro Steel Fibers","authors":"Hye Jung Kim, Nam Wook Kim","doi":"10.11648/J.AJCE.20200801.11","DOIUrl":"https://doi.org/10.11648/J.AJCE.20200801.11","url":null,"abstract":"Hybrid fiber reinforcement with both macro and micro steel fibers in the concrete matrix is applied in order to evaluate its effectiveness for crack arresting. One of the main objectives of this research is to establish a crack-free high performance concrete. In severe conditions, which may require high water tightness, such as a storage structure for low-level radioactive waste, crack-free high performance concrete structures could be applied. Hybrid fiber reinforcement is well known because it can show excellent performance with a suitable combination of fibers. In this study which deals with hybrid fiber reinforced concrete made with different fiber lengths and fiber contents, the factors which quantify crack resistance of concrete, mainly the first crack strength, flexural strength and strain energy release rate are examined. In this research, the crack resistance of concrete was investigated using the notched specimen by the 4-point bending test for the fiber reinforced concrete and hybrid fiber reinforced concrete (adding the macro and micro fibers). The general conclusions obtained are as follows. To the investigation of the crack resistance of concrete, we obtained the new theoretical equation of the critical strain energy release rate for the hybrid fiber reinforced concrete, and a deep correlation between experimental value and theoretical value was shown. Though in this research, total fiber contents 2.5% showed the maximum values in the strength and crack resistance, an investigation of the totally mechanical behavior needs more widely range of experiment.","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"22 1","pages":"1"},"PeriodicalIF":0.0,"publicationDate":"2020-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78374995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-26DOI: 10.11648/J.AJCE.20190706.12
Zhongkun Zhang, Linlin Wang, Xueyang Xing
In recent years, there has been an increasing amount of literature on pile’s effective length. A number of studies have found that the single pile’s effective length could be computed by means of different methods which are unsuitable for grouped piles’ computation. In order to understand how the effective length of piles should be calculated, a series of studies was performed in this paper. On the basis of numerical analysis for grouped piles foundation, the computed results indicate the existence of piles’ effective length. Taking an engineering example as a case, both the finite element analysis and the semi-analytical element analysis are used for analyzing. It is revealed that the influencing factors of grouped piles’ effective length are as follows: the pile-soil modulus ratio, top load distribution area, pile diameter, etc. The grouped piles’ effective length increases gradually with the increasing top load distribution area. Although it is difficult to use an appropriate formula to reflect the influence of various factors on the grouped piles length, different various factors can be considered in the numerical simulation analysis. The influencing factors on the grouped piles’ effective length should be considered synthetically. An example of highway in-situ study makes the grouped piles’ effective length be understood deeply both in theory and practice.
{"title":"Determination of Grouped Piles’ Effective Length Based on Numerical Analysis Solution","authors":"Zhongkun Zhang, Linlin Wang, Xueyang Xing","doi":"10.11648/J.AJCE.20190706.12","DOIUrl":"https://doi.org/10.11648/J.AJCE.20190706.12","url":null,"abstract":"In recent years, there has been an increasing amount of literature on pile’s effective length. A number of studies have found that the single pile’s effective length could be computed by means of different methods which are unsuitable for grouped piles’ computation. In order to understand how the effective length of piles should be calculated, a series of studies was performed in this paper. On the basis of numerical analysis for grouped piles foundation, the computed results indicate the existence of piles’ effective length. Taking an engineering example as a case, both the finite element analysis and the semi-analytical element analysis are used for analyzing. It is revealed that the influencing factors of grouped piles’ effective length are as follows: the pile-soil modulus ratio, top load distribution area, pile diameter, etc. The grouped piles’ effective length increases gradually with the increasing top load distribution area. Although it is difficult to use an appropriate formula to reflect the influence of various factors on the grouped piles length, different various factors can be considered in the numerical simulation analysis. The influencing factors on the grouped piles’ effective length should be considered synthetically. An example of highway in-situ study makes the grouped piles’ effective length be understood deeply both in theory and practice.","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88655786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-10DOI: 10.11648/J.AJCE.20190706.11
Shouguo Yang, Jia Jin, Xuanzhao Lu
The process of China's large-scale urbanization is constantly advancing, and public transportation problems are increasingly prominent. In recent years, major cities have been building subways. The advantages of the subway, such as fast and low carbon, have become an important means for large cities to solve urban public transportation. With the development of urban subway construction technology and operation scale and the continuous improvement of people's safety concept, the problem of evacuation of people in emergencies such as fires has increasingly aroused people's understanding. In order to explore the influence of the location of the facility space on the station floor to the evacuation of people in the event of an emergency, this paper optimizes the analysis of the traffic facilities such as the automatic ticket gate and the guide railing in the public area of the subway based on the pathfinder evacuation software. The location of the facility space at the station floor of the subsequent construction has been actively assisted. The simulation results show that the opening of the guide rail at the gate and the entrance and exit of the security inspection has a restraining effect on the evacuation of personnel; the spatial arrangement of the subway gate has a significant impact on the evacuation of personnel, and the layout of the distributed gates is not correct. The personnel at the exit of the escalator caused blockages, which was better than the centralized arrangement.
{"title":"Research on Spatial Arrangement of Metro Station Floor Facilities Based on Pathfinder","authors":"Shouguo Yang, Jia Jin, Xuanzhao Lu","doi":"10.11648/J.AJCE.20190706.11","DOIUrl":"https://doi.org/10.11648/J.AJCE.20190706.11","url":null,"abstract":"The process of China's large-scale urbanization is constantly advancing, and public transportation problems are increasingly prominent. In recent years, major cities have been building subways. The advantages of the subway, such as fast and low carbon, have become an important means for large cities to solve urban public transportation. With the development of urban subway construction technology and operation scale and the continuous improvement of people's safety concept, the problem of evacuation of people in emergencies such as fires has increasingly aroused people's understanding. In order to explore the influence of the location of the facility space on the station floor to the evacuation of people in the event of an emergency, this paper optimizes the analysis of the traffic facilities such as the automatic ticket gate and the guide railing in the public area of the subway based on the pathfinder evacuation software. The location of the facility space at the station floor of the subsequent construction has been actively assisted. The simulation results show that the opening of the guide rail at the gate and the entrance and exit of the security inspection has a restraining effect on the evacuation of personnel; the spatial arrangement of the subway gate has a significant impact on the evacuation of personnel, and the layout of the distributed gates is not correct. The personnel at the exit of the escalator caused blockages, which was better than the centralized arrangement.","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74150172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-03DOI: 10.11648/j.ajce.20190705.14
Shen Yanhua, Cai Gaojie
With the development of urban construction, it is inevitable that new or expanded highways cross or parallel with existing buried pipelines. The impact vibration caused by the construction of perforated pile foundation of highway bridge is bound to have adverse effects on the safe operation of adjacent buried pipelines. Based on the micro seismic monitoring technique, the characteristics of pile foundation construction vibration is researched. A series of sensors are placed on the surface and adjacent pipelines to collect micro seismic events of impact hammer on different hoisting height and different excavation depth of pile foundation construction. Thus, the wave characteristics, spectrum characteristics and energy attenuation law of microseismic signal are analyzed, and the influencing factors of construction vibration are studied. It is found that the peak value of acceleration vibration in the vertical direction is the largest, followed by the peak value of radial acceleration vibration, the vibration energy decays in power relation with the propagation distance, and with the increase of the pile hole depth, the vibration velocity of the same horizontal distance decreases gradually. The attenuation is related to the geological condition of a certain pile hole depth. The research results have some guiding significance for the vibration control of pile foundation construction.
{"title":"Experimental Study on Microseismic Monitoring Highway Bridge Pile Foundation Construction","authors":"Shen Yanhua, Cai Gaojie","doi":"10.11648/j.ajce.20190705.14","DOIUrl":"https://doi.org/10.11648/j.ajce.20190705.14","url":null,"abstract":"With the development of urban construction, it is inevitable that new or expanded highways cross or parallel with existing buried pipelines. The impact vibration caused by the construction of perforated pile foundation of highway bridge is bound to have adverse effects on the safe operation of adjacent buried pipelines. Based on the micro seismic monitoring technique, the characteristics of pile foundation construction vibration is researched. A series of sensors are placed on the surface and adjacent pipelines to collect micro seismic events of impact hammer on different hoisting height and different excavation depth of pile foundation construction. Thus, the wave characteristics, spectrum characteristics and energy attenuation law of microseismic signal are analyzed, and the influencing factors of construction vibration are studied. It is found that the peak value of acceleration vibration in the vertical direction is the largest, followed by the peak value of radial acceleration vibration, the vibration energy decays in power relation with the propagation distance, and with the increase of the pile hole depth, the vibration velocity of the same horizontal distance decreases gradually. The attenuation is related to the geological condition of a certain pile hole depth. The research results have some guiding significance for the vibration control of pile foundation construction.","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"25 1","pages":"141"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72892874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-03DOI: 10.11648/j.ajce.20190705.13
Qi-Rui Zhang, B. Guo
BIM is regarded as a new problem-solving method in the field of architecture construction. With the continuous development and progress of BIM, it also has a series of impacts on the field of project cost. In this paper, through literature research, expert interviews, questionnaires, data analysis, and other ways, the current front-line AEC (architecture, Engineering & Construction) practitioners were investigated. This paper investigates the understanding of BIM in the field of construction cost and the current development obstacles and makes a cross-analysis of the development obstacles of various industries. It is found that technology is the most important obstacle in technology, economy, society and other factors, and how to solve the problem of model standardization and accuracy is the most important part. In the cross research of technical problems and professions, we found that there are many deficiencies in the modeling function of current BIM software, and there are also some problems in the transformation of two-dimensional and three-dimensional data, which are considered as obstacles of the whole industry. The research results of this paper can be used as a practical reference for future research, trying to provide technical and management solutions for the implementation and development of BIM in the construction cost of our country.
{"title":"Discussion on the Development Barriers of BIM Construction Costs in China","authors":"Qi-Rui Zhang, B. Guo","doi":"10.11648/j.ajce.20190705.13","DOIUrl":"https://doi.org/10.11648/j.ajce.20190705.13","url":null,"abstract":"BIM is regarded as a new problem-solving method in the field of architecture construction. With the continuous development and progress of BIM, it also has a series of impacts on the field of project cost. In this paper, through literature research, expert interviews, questionnaires, data analysis, and other ways, the current front-line AEC (architecture, Engineering & Construction) practitioners were investigated. This paper investigates the understanding of BIM in the field of construction cost and the current development obstacles and makes a cross-analysis of the development obstacles of various industries. It is found that technology is the most important obstacle in technology, economy, society and other factors, and how to solve the problem of model standardization and accuracy is the most important part. In the cross research of technical problems and professions, we found that there are many deficiencies in the modeling function of current BIM software, and there are also some problems in the transformation of two-dimensional and three-dimensional data, which are considered as obstacles of the whole industry. The research results of this paper can be used as a practical reference for future research, trying to provide technical and management solutions for the implementation and development of BIM in the construction cost of our country.","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80651966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-20DOI: 10.11648/j.ajce.20190705.12
Reham Alasmar
Definitions of beauty and space are as diverse as defined by the disciplines in which it plays a fundamental role; from science and philosophy to art and architecture, each field’s definition for the perception of the beauty of space is often simplified or reduced. This consequently denies us access new spaces whose definitions and perspectives, strategies and impacts on human perception of beauty of space are rarely considered in any cohesive manner. The debate, “Perception of beauty in Architecture and human perception of space”. The research tries to reflect upon new understanding to the meaning of beauty in architecture and thus access new definitions and understanding to the beauty perspectives, strategies and processes of perception beauty in architecture. Some works of architecture have remarkable aesthetic value. According to certain philosophers, part of this value derives from the appearance of such constructions to fulfill the function for which they were built. The research digs through the dilemma of form follows function and argues that one way of understanding the connection between function and aesthetic value resides in the concept of functional and beauty together not the idea of function vs. beauty; the paper attempts to offer a better way of understanding it.
{"title":"Philosophy and Perception of Beauty in Architecture","authors":"Reham Alasmar","doi":"10.11648/j.ajce.20190705.12","DOIUrl":"https://doi.org/10.11648/j.ajce.20190705.12","url":null,"abstract":"Definitions of beauty and space are as diverse as defined by the disciplines in which it plays a fundamental role; from science and philosophy to art and architecture, each field’s definition for the perception of the beauty of space is often simplified or reduced. This consequently denies us access new spaces whose definitions and perspectives, strategies and impacts on human perception of beauty of space are rarely considered in any cohesive manner. The debate, “Perception of beauty in Architecture and human perception of space”. The research tries to reflect upon new understanding to the meaning of beauty in architecture and thus access new definitions and understanding to the beauty perspectives, strategies and processes of perception beauty in architecture. Some works of architecture have remarkable aesthetic value. According to certain philosophers, part of this value derives from the appearance of such constructions to fulfill the function for which they were built. The research digs through the dilemma of form follows function and argues that one way of understanding the connection between function and aesthetic value resides in the concept of functional and beauty together not the idea of function vs. beauty; the paper attempts to offer a better way of understanding it.","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89913128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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