Pub Date : 2022-01-01DOI: 10.11648/j.ajce.20221002.13
Kapnang Franky, Lei Chen, Du Mengxing, Ngalle Itoumbou Christina Joyce
{"title":"Elastic-plastic Buckling Analysis of Q690 High Strength Steel Tubes Under Global Bending","authors":"Kapnang Franky, Lei Chen, Du Mengxing, Ngalle Itoumbou Christina Joyce","doi":"10.11648/j.ajce.20221002.13","DOIUrl":"https://doi.org/10.11648/j.ajce.20221002.13","url":null,"abstract":"","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78810036","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 : 2022-01-01DOI: 10.11648/j.ajce.20221002.14
Shoshi Ofek, A. Ghermandi, B. Portnov
{"title":"The Effect of the Expected Time-to-Purchase on the Acceptable Price Premium for Green Buildings","authors":"Shoshi Ofek, A. Ghermandi, B. Portnov","doi":"10.11648/j.ajce.20221002.14","DOIUrl":"https://doi.org/10.11648/j.ajce.20221002.14","url":null,"abstract":"","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85717872","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 : 2022-01-01DOI: 10.11648/j.ajce.20221001.11
C. Richardson, Tracy Sadler
: The final closure veneer for municipal solid waste landfills must be designed to withstand an allowable annual soil loss from wind erosion over its design life. Veneer sensitivity to wind erosion depends on a multiplicity of intertwined variables. A Fuzzy Analytical Hierarchy Process (FAHP) is used to evaluate weightings for specific forcing function criteria to assess overall wind erosion sensitivity (WES) at current and former landfill locations based on input from multiple decision makers selected from consulting, regulatory
{"title":"Evaluating Wind Erosion Sensitivity for Landfill Sites in New Mexico Using Fuzzy Analytical Hierarchy Process (FAHP)","authors":"C. Richardson, Tracy Sadler","doi":"10.11648/j.ajce.20221001.11","DOIUrl":"https://doi.org/10.11648/j.ajce.20221001.11","url":null,"abstract":": The final closure veneer for municipal solid waste landfills must be designed to withstand an allowable annual soil loss from wind erosion over its design life. Veneer sensitivity to wind erosion depends on a multiplicity of intertwined variables. A Fuzzy Analytical Hierarchy Process (FAHP) is used to evaluate weightings for specific forcing function criteria to assess overall wind erosion sensitivity (WES) at current and former landfill locations based on input from multiple decision makers selected from consulting, regulatory","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89398448","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 : 2022-01-01DOI: 10.11648/j.ajce.20221002.15
Ngalle Itoumbou Christina Joyce, Lei Chen, Kapnang Franky
{"title":"Nonlinear Stability Analysis of Elastic High Strength Steel Tubes Under Global Bending","authors":"Ngalle Itoumbou Christina Joyce, Lei Chen, Kapnang Franky","doi":"10.11648/j.ajce.20221002.15","DOIUrl":"https://doi.org/10.11648/j.ajce.20221002.15","url":null,"abstract":"","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"96 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76442950","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 : 2022-01-01DOI: 10.11648/j.ajce.20221002.12
Xiaojun Yin, Jun Xie
{"title":"Stability Analysis of Tunnel by External Force Increment Method","authors":"Xiaojun Yin, Jun Xie","doi":"10.11648/j.ajce.20221002.12","DOIUrl":"https://doi.org/10.11648/j.ajce.20221002.12","url":null,"abstract":"","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85311886","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 : 2021-11-12DOI: 10.11648/J.AJCE.20210906.12
Lan Zhang, Thomas Zhang, Junhui Heng
Safety is one of the greatest challenges in the construction industry. Researchers proposed various safety systems to manage site safety and improve safety performance at the project level. However, these safety systems still exhibit large disconnections between the theoretical components of the systems, luck the risk prevention from specific work procedure and controlling methods. As a result, different safety teams often implement safety plans and activities in different ways, yielding different results without stability of the safety system. A safety framework that based on the construction method statement with a clear logic of safety management elements under controlling points is proposed to increase the efficiency of safety system execution at the project level to reduce the safety risks systematically. This study begins by analysing safety systems currently on the market and breaks them down to three main components: setting up the framework through systematic models, interconnecting various safety elements through safety management theories with logic, and controlling safety management data flow through an artificial neural network model, where corporate safety management frameworks are incorporated at the project level. Then the framework is further applied and tested in a semiconductor project. This framework provides an integration of safety elements, field activities and associated risks, draft the path and flow of information data generated from the safety activities and controlling points of data which enable the field safety management system to be executed with new technology of cloud based algorithm at project levels. Because each project is different based on the construction methods and sequence, the framework only covers a certain depth in the construction process based on the assumption of construction sequence presented in the study. Nevertheless, each project requires a custom design framework to accommodate the special construction method and sequence which might be different from this study to increase construction safety performance.
{"title":"Project-Level Safety Management Framework for Semiconductor Project","authors":"Lan Zhang, Thomas Zhang, Junhui Heng","doi":"10.11648/J.AJCE.20210906.12","DOIUrl":"https://doi.org/10.11648/J.AJCE.20210906.12","url":null,"abstract":"Safety is one of the greatest challenges in the construction industry. Researchers proposed various safety systems to manage site safety and improve safety performance at the project level. However, these safety systems still exhibit large disconnections between the theoretical components of the systems, luck the risk prevention from specific work procedure and controlling methods. As a result, different safety teams often implement safety plans and activities in different ways, yielding different results without stability of the safety system. A safety framework that based on the construction method statement with a clear logic of safety management elements under controlling points is proposed to increase the efficiency of safety system execution at the project level to reduce the safety risks systematically. This study begins by analysing safety systems currently on the market and breaks them down to three main components: setting up the framework through systematic models, interconnecting various safety elements through safety management theories with logic, and controlling safety management data flow through an artificial neural network model, where corporate safety management frameworks are incorporated at the project level. Then the framework is further applied and tested in a semiconductor project. This framework provides an integration of safety elements, field activities and associated risks, draft the path and flow of information data generated from the safety activities and controlling points of data which enable the field safety management system to be executed with new technology of cloud based algorithm at project levels. Because each project is different based on the construction methods and sequence, the framework only covers a certain depth in the construction process based on the assumption of construction sequence presented in the study. Nevertheless, each project requires a custom design framework to accommodate the special construction method and sequence which might be different from this study to increase construction safety performance.","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79275756","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 : 2021-11-10DOI: 10.11648/J.AJCE.20210906.11
A. Ibrahim, H. Askar
This paper tends to evaluate the behavior of five- story RC building with and without floating columns using RC frames as lateral resisting system. This investigation had been carried-out using ETABS Ultimate V.18.1.1. The defined load cases, load combinations, the equivalent static lateral load pattern, and the response spectrum function were defined according ASCE7-16. The design criteria were set to be according to ACI 318-14. Eleven cases were proposed to investigate this behavior. One case was the building without floating columns. Nine cases were the building with different floating column schemes and the final case was the building with floating columns and another lateral resisting system (shear walls) for comparison purpose. Further comparisons of the results for all models are executed on the basis of parameters such as, story displacement, story drift, story stiffness, and response spectrum modal period. The results showed that, although the floating columns play an important role in architectural divisions or in multi-use buildings, but it affected the stiffness of the building negatively that led to increasing of the story lateral displacement and drift, also it led to increasing of modal time period. This mostly led to using a more stiffness lateral resisting system and eventually increasing the building’s structural costs.
{"title":"Dynamic Analysis of a Multistory Frame RC Building with and Without Floating Columns","authors":"A. Ibrahim, H. Askar","doi":"10.11648/J.AJCE.20210906.11","DOIUrl":"https://doi.org/10.11648/J.AJCE.20210906.11","url":null,"abstract":"This paper tends to evaluate the behavior of five- story RC building with and without floating columns using RC frames as lateral resisting system. This investigation had been carried-out using ETABS Ultimate V.18.1.1. The defined load cases, load combinations, the equivalent static lateral load pattern, and the response spectrum function were defined according ASCE7-16. The design criteria were set to be according to ACI 318-14. Eleven cases were proposed to investigate this behavior. One case was the building without floating columns. Nine cases were the building with different floating column schemes and the final case was the building with floating columns and another lateral resisting system (shear walls) for comparison purpose. Further comparisons of the results for all models are executed on the basis of parameters such as, story displacement, story drift, story stiffness, and response spectrum modal period. The results showed that, although the floating columns play an important role in architectural divisions or in multi-use buildings, but it affected the stiffness of the building negatively that led to increasing of the story lateral displacement and drift, also it led to increasing of modal time period. This mostly led to using a more stiffness lateral resisting system and eventually increasing the building’s structural costs.","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"139 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76712832","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 : 2021-10-29DOI: 10.11648/J.AJCE.20210905.13
Hui Zhang, Xing-hai Dang, Liqi Jia, Jianyun Zhao, Ming Lu
In recent years, due to the obvious ground settlement and other phenomena of the Yinxi Industrial Park in Baiyin, it has brought many hidden dangers to the local development, it is of great practical significance to monitor the deformation of the area for a long time series. The ground deformation field of Yinxi Industrial Park from June 2018 to April 2021 was obtained by processing Sentinel-1A data using SBAS technology, and the high coherence point D1 was predicted and analyzed by BP neural network. The results show that subsidence occurs in several places in the Yinxi Industrial Park, and the average annual subsidence rate ranges from -19.28 mm to 5.08 mm, the areas of severe settlement have a clear geographical distribution, mainly concentrated in road and building areas, other areas have a more stable ground base; the mean square error in the BP neural network prediction result is 2.56 mm, and the average relative error is 6.06%, which is a high prediction accuracy. The predicted cumulative settlement value at point D1 in 2023 is 45 mm, and there is a tendency for the settlement to intensify. The prediction results are of great significance for the early identification and prevention of ground settlement in the study area.
{"title":"Application of SBAS Technique Combined with BP Neural Network in the Settlement of the Yinxi Industrial Park in Baiyin","authors":"Hui Zhang, Xing-hai Dang, Liqi Jia, Jianyun Zhao, Ming Lu","doi":"10.11648/J.AJCE.20210905.13","DOIUrl":"https://doi.org/10.11648/J.AJCE.20210905.13","url":null,"abstract":"In recent years, due to the obvious ground settlement and other phenomena of the Yinxi Industrial Park in Baiyin, it has brought many hidden dangers to the local development, it is of great practical significance to monitor the deformation of the area for a long time series. The ground deformation field of Yinxi Industrial Park from June 2018 to April 2021 was obtained by processing Sentinel-1A data using SBAS technology, and the high coherence point D1 was predicted and analyzed by BP neural network. The results show that subsidence occurs in several places in the Yinxi Industrial Park, and the average annual subsidence rate ranges from -19.28 mm to 5.08 mm, the areas of severe settlement have a clear geographical distribution, mainly concentrated in road and building areas, other areas have a more stable ground base; the mean square error in the BP neural network prediction result is 2.56 mm, and the average relative error is 6.06%, which is a high prediction accuracy. The predicted cumulative settlement value at point D1 in 2023 is 45 mm, and there is a tendency for the settlement to intensify. The prediction results are of great significance for the early identification and prevention of ground settlement in the study area.","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"118 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83186791","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 : 2021-10-28DOI: 10.11648/J.AJCE.20210905.12
Aman Bunta, B. Abate
Loss of soil fertility in agricultural lands and sedimentation in lakes of central rift valley of Ethiopia are major watershed problem threatening the agro economy in the area. To develop effective erosion control plans through implementing appropriate soil conservation practices, runoff and sediment yield in Meki watershed was estimated and analyzed using the SWAT model. The model showed the simulated mean annual surface runoff was 114.03mm and the mean annual streamflow was 9.41m3/s. Similarly, mean annual sediment load of 13.12 t/ha enters to Lake Ziway. The model was calibrated and validated on daily and monthly time step for flow and on monthly time step for sediment yield. The results of Nash Sutcliff Efficiency of 0.71 on daily and 0.89 on monthly time steps for streamflow and its value of 0.80 on monthly time step for sediment yield during calibration showed that there is a good match between measured and simulated data for both variables on daily basis and very good match on monthly basis. The potential erosion source areas were identified. Likewise, 51.34% of the watershed area was found to be potential erosion sources and priorized for erosion control plans.
{"title":"Runoff and Sediment Yield Modeling of Meki River Watershed Using SWAT Model in Rift Valley Lakes Basin, Ethiopia","authors":"Aman Bunta, B. Abate","doi":"10.11648/J.AJCE.20210905.12","DOIUrl":"https://doi.org/10.11648/J.AJCE.20210905.12","url":null,"abstract":"Loss of soil fertility in agricultural lands and sedimentation in lakes of central rift valley of Ethiopia are major watershed problem threatening the agro economy in the area. To develop effective erosion control plans through implementing appropriate soil conservation practices, runoff and sediment yield in Meki watershed was estimated and analyzed using the SWAT model. The model showed the simulated mean annual surface runoff was 114.03mm and the mean annual streamflow was 9.41m3/s. Similarly, mean annual sediment load of 13.12 t/ha enters to Lake Ziway. The model was calibrated and validated on daily and monthly time step for flow and on monthly time step for sediment yield. The results of Nash Sutcliff Efficiency of 0.71 on daily and 0.89 on monthly time steps for streamflow and its value of 0.80 on monthly time step for sediment yield during calibration showed that there is a good match between measured and simulated data for both variables on daily basis and very good match on monthly basis. The potential erosion source areas were identified. Likewise, 51.34% of the watershed area was found to be potential erosion sources and priorized for erosion control plans.","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"103 1-2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91505570","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 : 2021-09-16DOI: 10.11648/J.AJCE.20210905.11
U. Ahmed, Assad Rashid, Z. Baig
Modern day construction is widely influenced using Steel-Concrete composite columns. The rapid growth in Steel-Concrete composite construction has significantly reduced the use of conventional Reinforced Cement Concrete (R.C.C) as well as other steel construction practices. Steel-Concrete composite construction gained an extensive receiving around the globe. Considering the fact that R.C.C construction is most suitable and economic for low-rise construction so it is used in framing system in most structures. However; increased dead load, span restriction, less stiffness and risky formwork makes R.C.C construction uneconomical and not suitable when it comes to intermediate to high-rise buildings. One Basement and 11 storeys existing building has been analyzed and comparison has been made between R.CC structure and concrete steel composite columns. Equivalent Static non -linear analysis was performed in X and Y direction by using Etabs 2017 software which results that encased composite columns construction cost is more than R.C.C columns but on the other hand encased composite columns has more floor area, the storey shear is more, story drift is less, storey displacement is less, in conventional R.C.C structures, storey shear is less in R.C.C conventional structure. Therefore; this research aims to analyze and to learn This research is an effort to learn cost effectiveness, increased or decreased stiffness and change on functionality of composite construction for intermediate to high-rise buildings in Pakistan. A Base + Ground +11 storey commercial building was selected for this study. Comparison is done between conventional R.C.C structure and Encased Composite column structure. Equivalent Static non-linear analysis was performed using ETABS 2017 software. Although for Base + Ground + 11 storey building the construction cost is 7.7% more than R.C.C structure but encased composite column building has 13.013% more floor area. This increased floor area will help to settle the cost difference between two structures.
{"title":"Economic and Functional Feasibility of Concrete and Steel Composite Column Building Structure","authors":"U. Ahmed, Assad Rashid, Z. Baig","doi":"10.11648/J.AJCE.20210905.11","DOIUrl":"https://doi.org/10.11648/J.AJCE.20210905.11","url":null,"abstract":"Modern day construction is widely influenced using Steel-Concrete composite columns. The rapid growth in Steel-Concrete composite construction has significantly reduced the use of conventional Reinforced Cement Concrete (R.C.C) as well as other steel construction practices. Steel-Concrete composite construction gained an extensive receiving around the globe. Considering the fact that R.C.C construction is most suitable and economic for low-rise construction so it is used in framing system in most structures. However; increased dead load, span restriction, less stiffness and risky formwork makes R.C.C construction uneconomical and not suitable when it comes to intermediate to high-rise buildings. One Basement and 11 storeys existing building has been analyzed and comparison has been made between R.CC structure and concrete steel composite columns. Equivalent Static non -linear analysis was performed in X and Y direction by using Etabs 2017 software which results that encased composite columns construction cost is more than R.C.C columns but on the other hand encased composite columns has more floor area, the storey shear is more, story drift is less, storey displacement is less, in conventional R.C.C structures, storey shear is less in R.C.C conventional structure. Therefore; this research aims to analyze and to learn This research is an effort to learn cost effectiveness, increased or decreased stiffness and change on functionality of composite construction for intermediate to high-rise buildings in Pakistan. A Base + Ground +11 storey commercial building was selected for this study. Comparison is done between conventional R.C.C structure and Encased Composite column structure. Equivalent Static non-linear analysis was performed using ETABS 2017 software. Although for Base + Ground + 11 storey building the construction cost is 7.7% more than R.C.C structure but encased composite column building has 13.013% more floor area. This increased floor area will help to settle the cost difference between two structures.","PeriodicalId":7606,"journal":{"name":"American Journal of Civil Engineering","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79408892","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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