Pub Date : 2020-11-01DOI: 10.22075/JRCE.2018.13233.1241
E. Olyaie, M. Heydari, H. Banejad, K. Chau
The piano key weir (PKW) is a type of nonlinear control structure that can be used to increase unit discharge over linear overflow weir geometries, particularly when the weir footprint area is restricted To predict the outflow passing over a piano key weir, the discharge coefficient in the general equation of weir needs to be known. This paper presents the results of laboratory model testing of a piano key weir located on the straight open channel flume in the hydraulic laboratory of Bu-Ali Sina University. The discharge coefficient of piano key weir is estimated by using four computational intelligence approaches, namely, feed forward back-propagation neural network (FFBPN), an extension of genetic programming namely gene-expression programming (GEP), least square support vector machine (LSSVM) and extreme learning machine (ELM). For this purpose, 70 laboratory test results were used for determining discharge coefficient of piano key weir for a wide range of discharge values. Coefficient of determination (R2), Nash-Sutcliffe efficiency coefficient (NS), root mean square error (RMSE), mean absolute relative error (MARE), scatter index (SI) and BIAS are used for measuring the models’ performance. Overall performance of the models shows that, all the studied models are able to estimate discharge coefficient of piano key weir satisfactorily. Comparison of results showed that the ELM (R2=0.997 and NS= 0.986) and LSSVM (RMSE=0.016 and MARE=0.027) models were able to produce better results than the other models investigated and could be employed successfully in modeling discharge coefficient from the available experimental data.
{"title":"A laboratory investigation on the potential of computational intelligence approaches to estimate the discharge coefficient of piano key weir","authors":"E. Olyaie, M. Heydari, H. Banejad, K. Chau","doi":"10.22075/JRCE.2018.13233.1241","DOIUrl":"https://doi.org/10.22075/JRCE.2018.13233.1241","url":null,"abstract":"The piano key weir (PKW) is a type of nonlinear control structure that can be used to increase unit discharge over linear overflow weir geometries, particularly when the weir footprint area is restricted To predict the outflow passing over a piano key weir, the discharge coefficient in the general equation of weir needs to be known. This paper presents the results of laboratory model testing of a piano key weir located on the straight open channel flume in the hydraulic laboratory of Bu-Ali Sina University. The discharge coefficient of piano key weir is estimated by using four computational intelligence approaches, namely, feed forward back-propagation neural network (FFBPN), an extension of genetic programming namely gene-expression programming (GEP), least square support vector machine (LSSVM) and extreme learning machine (ELM). For this purpose, 70 laboratory test results were used for determining discharge coefficient of piano key weir for a wide range of discharge values. Coefficient of determination (R2), Nash-Sutcliffe efficiency coefficient (NS), root mean square error (RMSE), mean absolute relative error (MARE), scatter index (SI) and BIAS are used for measuring the models’ performance. Overall performance of the models shows that, all the studied models are able to estimate discharge coefficient of piano key weir satisfactorily. Comparison of results showed that the ELM (R2=0.997 and NS= 0.986) and LSSVM (RMSE=0.016 and MARE=0.027) models were able to produce better results than the other models investigated and could be employed successfully in modeling discharge coefficient from the available experimental data.","PeriodicalId":52415,"journal":{"name":"Journal of Rehabilitation in Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87938310","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 : 2020-08-20DOI: 10.22075/JRCE.2020.19676.1377
A. Mazaheri, N. Delfani, M. Komasi, M. Nasiri
Compacted clay layers are known as one of the common low impermeable layers used in geotechnical structures. Due to geotechnical properties, these layers damaged through cracks in their lifespan. This research has attempted to improve the workability by using self-healing features of clays. By conducting numerous experimental tests, it has been shown that, by increasing the plasticity index of clays, the pace of crack healing process will be enhanced. Experiments have shown that percentages of Montmorillonite Nano Clay (MNC) are quite effective and reduce the flow rate in the samples, which is a sign of self-healing of the cracks by an NC additive. On this basis, NC can be perfectly used to repairing cracks in clayey soils. The results of this study show that in the sample with 1 mm crack, about 500 milliliters of water pass through the crack in 60 minutes under no pressuring conditions. While, if the sample contains 2 and 5 percent NC, the amount of water passing through the cracks within 60 minutes, will be 40 and 5 ml, respectively. This dramatic reduction for passing water reflects the positive effect of Nano sized grains on the closure of the created cracks. Therefore, it can be concluded that the self-healing process occurs earlier in smaller cracks, because the NC and soil particles can easily touch each other after swelling. Five percent of MNC can insure the cracks closure at 100% density. I
{"title":"Experimentally Investigation of Nano Clay Effects on Leaching and Self-healing Process of Cracked Clayey Soils","authors":"A. Mazaheri, N. Delfani, M. Komasi, M. Nasiri","doi":"10.22075/JRCE.2020.19676.1377","DOIUrl":"https://doi.org/10.22075/JRCE.2020.19676.1377","url":null,"abstract":"Compacted clay layers are known as one of the common low impermeable layers used in geotechnical structures. Due to geotechnical properties, these layers damaged through cracks in their lifespan. This research has attempted to improve the workability by using self-healing features of clays. By conducting numerous experimental tests, it has been shown that, by increasing the plasticity index of clays, the pace of crack healing process will be enhanced. Experiments have shown that percentages of Montmorillonite Nano Clay (MNC) are quite effective and reduce the flow rate in the samples, which is a sign of self-healing of the cracks by an NC additive. On this basis, NC can be perfectly used to repairing cracks in clayey soils. The results of this study show that in the sample with 1 mm crack, about 500 milliliters of water pass through the crack in 60 minutes under no pressuring conditions. While, if the sample contains 2 and 5 percent NC, the amount of water passing through the cracks within 60 minutes, will be 40 and 5 ml, respectively. This dramatic reduction for passing water reflects the positive effect of Nano sized grains on the closure of the created cracks. Therefore, it can be concluded that the self-healing process occurs earlier in smaller cracks, because the NC and soil particles can easily touch each other after swelling. Five percent of MNC can insure the cracks closure at 100% density. I","PeriodicalId":52415,"journal":{"name":"Journal of Rehabilitation in Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82431948","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 : 2020-08-01DOI: 10.22075/JRCE.2020.16540.1310
S. I. Javadein, R. Madandoust, S. M. Mirhosseini
By increasing the demolition of old concrete structures and the interest of civil industries to consume cheaper materials, using Recycled Concrete Aggregate (RCA) can cause environmental protection and decrease the construction costs. On the other hand, the high potential of Recycled Aggregate Concrete (RAC) in concrete industry was established by extensive experimental researches were performed to examine the properties of RAC. Like in conventional concrete, core test cut from RAC can be used to assess the in-place concrete compressive strength and sometimes it becomes an important test for monitoring in-situ properties of concrete to taking up retrofitting/strengthening measures. So the core test is often mentioned in most codes for concrete testing. The layout of this study includes four concrete mixes, two concrete grades (20 and 40 MPa), three core diameters (46, 69, and 100 mm), five length-to-diameter (L/D) ratios (1, 1.25, 1.5, 1.75, and 2), two sizes of maximum coarse recycled aggregates (10 and 20 mm), two directions of core drilling which are vertical and horizontal and three ages of the specimen (14, 28 and 90 days). The core test results were compared to cylindrical and cube specimens. Results imply that the core strength of recycled concrete reduces with the increase in aspect ratio, by decreasing the core diameter, increasing the size of coarse aggregates in recycled concrete. By analyzing the results a comparison was made between recycled concrete in this study and conventional concrete in other studies, as well as code instructions.
{"title":"In situ strength assessment of concrete using recycled aggregates by means of small diameter cores.","authors":"S. I. Javadein, R. Madandoust, S. M. Mirhosseini","doi":"10.22075/JRCE.2020.16540.1310","DOIUrl":"https://doi.org/10.22075/JRCE.2020.16540.1310","url":null,"abstract":"By increasing the demolition of old concrete structures and the interest of civil industries to consume cheaper materials, using Recycled Concrete Aggregate (RCA) can cause environmental protection and decrease the construction costs. On the other hand, the high potential of Recycled Aggregate Concrete (RAC) in concrete industry was established by extensive experimental researches were performed to examine the properties of RAC. Like in conventional concrete, core test cut from RAC can be used to assess the in-place concrete compressive strength and sometimes it becomes an important test for monitoring in-situ properties of concrete to taking up retrofitting/strengthening measures. So the core test is often mentioned in most codes for concrete testing. The layout of this study includes four concrete mixes, two concrete grades (20 and 40 MPa), three core diameters (46, 69, and 100 mm), five length-to-diameter (L/D) ratios (1, 1.25, 1.5, 1.75, and 2), two sizes of maximum coarse recycled aggregates (10 and 20 mm), two directions of core drilling which are vertical and horizontal and three ages of the specimen (14, 28 and 90 days). The core test results were compared to cylindrical and cube specimens. Results imply that the core strength of recycled concrete reduces with the increase in aspect ratio, by decreasing the core diameter, increasing the size of coarse aggregates in recycled concrete. By analyzing the results a comparison was made between recycled concrete in this study and conventional concrete in other studies, as well as code instructions.","PeriodicalId":52415,"journal":{"name":"Journal of Rehabilitation in Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86382561","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 : 2020-08-01DOI: 10.22075/JRCE.2020.17391.1324
N. Solatifar
Dynamic modulus characterizes the viscoelastic behavior of asphalt materials and is the most important input parameter for design and rehabilitation of flexible pavements using Mechanistic–Empirical Pavement Design Guide (MEPDG). Laboratory determination of dynamic modulus is very expensive and time consuming. To overcome this challenge, several predictive models were developed to determine dynamic modulus of asphalt mixtures instead of laboratory testing. Present study utilizes a large database of 1320 dynamic modulus test results developed at the University of Maryland to evaluate the performance and accuracy of different dynamic modulus predictive models. For this purpose, six conventional dynamic modulus predictive models including Witczak, Modified Witczak, Hirsch, Al-Khateeb, Global and Simplified Global models were considered and dynamic moduli of asphalt mixtures were determined. These moduli were then compared with those determined from laboratory test results. Performance evaluation of the models showed high prediction accuracy and low prediction bias with good correlation between predicted moduli and measured values for Witczak and Global models.
{"title":"Performance Evaluation of Dynamic Modulus Predictive Models for Asphalt Mixtures","authors":"N. Solatifar","doi":"10.22075/JRCE.2020.17391.1324","DOIUrl":"https://doi.org/10.22075/JRCE.2020.17391.1324","url":null,"abstract":"Dynamic modulus characterizes the viscoelastic behavior of asphalt materials and is the most important input parameter for design and rehabilitation of flexible pavements using Mechanistic–Empirical Pavement Design Guide (MEPDG). Laboratory determination of dynamic modulus is very expensive and time consuming. To overcome this challenge, several predictive models were developed to determine dynamic modulus of asphalt mixtures instead of laboratory testing. Present study utilizes a large database of 1320 dynamic modulus test results developed at the University of Maryland to evaluate the performance and accuracy of different dynamic modulus predictive models. For this purpose, six conventional dynamic modulus predictive models including Witczak, Modified Witczak, Hirsch, Al-Khateeb, Global and Simplified Global models were considered and dynamic moduli of asphalt mixtures were determined. These moduli were then compared with those determined from laboratory test results. Performance evaluation of the models showed high prediction accuracy and low prediction bias with good correlation between predicted moduli and measured values for Witczak and Global models.","PeriodicalId":52415,"journal":{"name":"Journal of Rehabilitation in Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85161142","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 : 2020-08-01DOI: 10.22075/JRCE.2020.17762.1340
S. Ghareh, F. Akhlaghi, K. Yazdani
Mashhad city is located on alluvial deposits where the expanded area of this city, especially the central and eastern areas surrounding Imam Reza holy shrine, are built on weak and fine-grained deposits. Therefore, the soil improvement would be inevitable due to construction of high-rise buildings such as hotels and commercial complexes in these areas, as well as restructuring old buildings. Today, the use of waste rubber tire to stabilize the soil is not only efficient to secure human health and clean the environment but also as an inexpensive additive to improve the behavior of problematic soils. In this research, waste rubber tires in three different dimensions (
{"title":"A Study on the Effects of Waste Rubber Tire Dimensions on Fine-Grained Soil Behavior","authors":"S. Ghareh, F. Akhlaghi, K. Yazdani","doi":"10.22075/JRCE.2020.17762.1340","DOIUrl":"https://doi.org/10.22075/JRCE.2020.17762.1340","url":null,"abstract":"Mashhad city is located on alluvial deposits where the expanded area of this city, especially the central and eastern areas surrounding Imam Reza holy shrine, are built on weak and fine-grained deposits. Therefore, the soil improvement would be inevitable due to construction of high-rise buildings such as hotels and commercial complexes in these areas, as well as restructuring old buildings. Today, the use of waste rubber tire to stabilize the soil is not only efficient to secure human health and clean the environment but also as an inexpensive additive to improve the behavior of problematic soils. In this research, waste rubber tires in three different dimensions (","PeriodicalId":52415,"journal":{"name":"Journal of Rehabilitation in Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75852504","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 : 2020-08-01DOI: 10.22075/JRCE.2020.19727.1379
M. Jalilkhani, M. Babaei, S. Ghasemi
This paper summarizes the lessons learned from a full-scale test on two RC frame prototypes that have recently been tested on LNEC shaking-table using four pairs of biaxial synthetic ground motion records during 15WCEE Conference (2012). The reference structures are two single-story RC frames which are geometrically identical but with different reinforcement details. The simplified inelastic models including ‘one-component’ inelastic elements with lumped plastic hinges at their ends are used to model the reference structures. The displacement demands of the RC frames are determined by using the nonlinear dynamic analyses and then compared with the exact test results for four different seismic hazards (intensities). In the initial pre-test analyses, the modeling parameters and deformation capacities for each RC element are determined using ASCE/SEI 41-13 standard. However in the post-test studies, the experimental equations developed by Panagiotakos and Fardis (2001), Haselton and Deierlein (2008) are used to obtain more accurate structural responses. A detailed comparison is carried out between the analytical results with those given by the tests. The results clearly show that there is fairly good agreement between the analytical and test results. The simplified inelastic modeling techniques are also identified accurate enough in estimating the seismic response of RC buildings under biaxial excitations.
{"title":"Evaluation of the Seismic Response of Single-Story RC Frames under Biaxial Earthquake Excitations","authors":"M. Jalilkhani, M. Babaei, S. Ghasemi","doi":"10.22075/JRCE.2020.19727.1379","DOIUrl":"https://doi.org/10.22075/JRCE.2020.19727.1379","url":null,"abstract":"This paper summarizes the lessons learned from a full-scale test on two RC frame prototypes that have recently been tested on LNEC shaking-table using four pairs of biaxial synthetic ground motion records during 15WCEE Conference (2012). The reference structures are two single-story RC frames which are geometrically identical but with different reinforcement details. The simplified inelastic models including ‘one-component’ inelastic elements with lumped plastic hinges at their ends are used to model the reference structures. The displacement demands of the RC frames are determined by using the nonlinear dynamic analyses and then compared with the exact test results for four different seismic hazards (intensities). In the initial pre-test analyses, the modeling parameters and deformation capacities for each RC element are determined using ASCE/SEI 41-13 standard. However in the post-test studies, the experimental equations developed by Panagiotakos and Fardis (2001), Haselton and Deierlein (2008) are used to obtain more accurate structural responses. A detailed comparison is carried out between the analytical results with those given by the tests. The results clearly show that there is fairly good agreement between the analytical and test results. The simplified inelastic modeling techniques are also identified accurate enough in estimating the seismic response of RC buildings under biaxial excitations.","PeriodicalId":52415,"journal":{"name":"Journal of Rehabilitation in Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90893148","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 : 2020-08-01DOI: 10.22075/JRCE.2020.19767.1381
M. Pourakbar, S. Tariverdilo
Failure modes in recent earthquakes on lightly reinforced shear walls includes rebar fracture and out of plane buckling of its boundary elements. In latest edition of ACI 318 and also latest amendment of NZS 3101-2006 to avoid rebar fracture in boundary elements, the minimum reinforcement ratio for shear walls is increased. This experimental study investigates that rather than increasing reinforcement ratio, is it possible to avoid rebar fracture by use of plain rebars in boundary elements of lightly reinforced shear walls. Experimental program includes specimens with plain and deformed rebars tested under monotonic and cyclic loading. Strain profile of the rebars are evaluated employing correlation between hardness and residual strain. Results indicate that failure of specimens with plain rebars occurs on single crack, however they have more uniform strain profile. On the other hand, in the specimens with plain and deformed rebars, out of plane buckling occurs at same crack width, but at different elongations. It is shown that local strain demand (crack width) has better correlation with out of plane buckling in comparison with average axial strain.
{"title":"Effect of Deformed and Plain Rebars on the Behavior of Lightly Reinforced Boundary Elements","authors":"M. Pourakbar, S. Tariverdilo","doi":"10.22075/JRCE.2020.19767.1381","DOIUrl":"https://doi.org/10.22075/JRCE.2020.19767.1381","url":null,"abstract":"Failure modes in recent earthquakes on lightly reinforced shear walls includes rebar fracture and out of plane buckling of its boundary elements. In latest edition of ACI 318 and also latest amendment of NZS 3101-2006 to avoid rebar fracture in boundary elements, the minimum reinforcement ratio for shear walls is increased. This experimental study investigates that rather than increasing reinforcement ratio, is it possible to avoid rebar fracture by use of plain rebars in boundary elements of lightly reinforced shear walls. Experimental program includes specimens with plain and deformed rebars tested under monotonic and cyclic loading. Strain profile of the rebars are evaluated employing correlation between hardness and residual strain. Results indicate that failure of specimens with plain rebars occurs on single crack, however they have more uniform strain profile. On the other hand, in the specimens with plain and deformed rebars, out of plane buckling occurs at same crack width, but at different elongations. It is shown that local strain demand (crack width) has better correlation with out of plane buckling in comparison with average axial strain.","PeriodicalId":52415,"journal":{"name":"Journal of Rehabilitation in Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85098719","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 : 2020-08-01DOI: 10.22075/JRCE.2020.19106.1360
A. Golafshar, M. Saghafi, Farshid Eshaghi
A review of previous studies shows that there are two general views on how to determine demand in structures through incremental nonlinear static analysis. In the first view, multi-modal methods are used to determine demand in structures. In this view, the applied load pattern is applied to the structure according to the shape of each vibration mode, assuming that the structure deformation follows the shape of the vibration mode, the capacity spectrum is drawn and after determining the target displacement and the corresponding demand for each vibration mode, the final demand is determined by combination of response modes. In the second view, structural analysis is performed as a single run nonlinear static analysis and the effect of different vibration modes is shown in one load pattern. In this method, the load pattern that has somehow the effect of different modes is applied to the structure and the structure is analyzed under this load pattern. In the second view, due to the non-conformity of the structure deformation and the lateral load of a particular vibration mode of the structure, the conventional capacity spectrum method cannot be used. Therefore, the purpose of this paper is to propose a method for drawing the capacity spectrum and determining the target displacement in single run nonlinear static analysis for non-adaptive load patterns. After presenting the equations, 3-storey, 9-storey and 20-storey frames have been selected and the results of the proposed method have been evaluated along with modal pushover and time history analysis for the frames.
{"title":"A new method for drawing the capacity spectrum for seismic analysis and structural rehabilitation","authors":"A. Golafshar, M. Saghafi, Farshid Eshaghi","doi":"10.22075/JRCE.2020.19106.1360","DOIUrl":"https://doi.org/10.22075/JRCE.2020.19106.1360","url":null,"abstract":"A review of previous studies shows that there are two general views on how to determine demand in structures through incremental nonlinear static analysis. In the first view, multi-modal methods are used to determine demand in structures. In this view, the applied load pattern is applied to the structure according to the shape of each vibration mode, assuming that the structure deformation follows the shape of the vibration mode, the capacity spectrum is drawn and after determining the target displacement and the corresponding demand for each vibration mode, the final demand is determined by combination of response modes. In the second view, structural analysis is performed as a single run nonlinear static analysis and the effect of different vibration modes is shown in one load pattern. In this method, the load pattern that has somehow the effect of different modes is applied to the structure and the structure is analyzed under this load pattern. In the second view, due to the non-conformity of the structure deformation and the lateral load of a particular vibration mode of the structure, the conventional capacity spectrum method cannot be used. Therefore, the purpose of this paper is to propose a method for drawing the capacity spectrum and determining the target displacement in single run nonlinear static analysis for non-adaptive load patterns. After presenting the equations, 3-storey, 9-storey and 20-storey frames have been selected and the results of the proposed method have been evaluated along with modal pushover and time history analysis for the frames.","PeriodicalId":52415,"journal":{"name":"Journal of Rehabilitation in Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77394377","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 : 2020-08-01DOI: 10.22075/JRCE.2020.19096.1359
Mirhadi Mirnaghizadeh, M. Hajiazizi, M. Nasiri
ABSTRACT The issue of environmental protection has led researchers to pay serious attention to waste tires. Civil engineers have found that waste tires can increase bearing capacity, earth slope stability, and other useful applications in civil engineering. In this paper, a series of experimental modeling have been performed to investigate the effect of waste tires on increasing the stability of sand slopes. The position and height of the waste tire are investigated to find the most suitable location to use the waste tire. Digital images were taken during the loading on the slope. Particle image velocity (PIV) is used to measure the deformation of the slope during loading. The results show that the reinforced waste tires reduce displacement by 78% and increase the bearing capacity up to 260%. The optimal position of tire pile with reinforcement heights of B, 2B, 3B inside the slope is upslope in terms of bearing capacity and displacements.
{"title":"Stabilization of Earth Slope by Waste Tire using Experimental Tests and PIV","authors":"Mirhadi Mirnaghizadeh, M. Hajiazizi, M. Nasiri","doi":"10.22075/JRCE.2020.19096.1359","DOIUrl":"https://doi.org/10.22075/JRCE.2020.19096.1359","url":null,"abstract":"ABSTRACT The issue of environmental protection has led researchers to pay serious attention to waste tires. Civil engineers have found that waste tires can increase bearing capacity, earth slope stability, and other useful applications in civil engineering. In this paper, a series of experimental modeling have been performed to investigate the effect of waste tires on increasing the stability of sand slopes. The position and height of the waste tire are investigated to find the most suitable location to use the waste tire. Digital images were taken during the loading on the slope. Particle image velocity (PIV) is used to measure the deformation of the slope during loading. The results show that the reinforced waste tires reduce displacement by 78% and increase the bearing capacity up to 260%. The optimal position of tire pile with reinforcement heights of B, 2B, 3B inside the slope is upslope in terms of bearing capacity and displacements.","PeriodicalId":52415,"journal":{"name":"Journal of Rehabilitation in Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81216439","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 : 2020-08-01DOI: 10.22075/JRCE.2020.18982.1356
H. Sarmast, H. Kazemi
The paper aims to extract the dynamic properties of existing structures without utilizing the analytical models. The ambient vibration testing could be used on any type of frame such as concrete, steeland masonry to investigate the structural vulnerability.The method could bethe first stage and necessarily forthe retrofit process. To achieve this aim, the ambient vibration testing can also be employed. The experimental data obtained from the methodcan be used to monitor the health, evaluating, and damage detection structures at present. The achieved datacan be comparedin future with the recorded signals at different times.
{"title":"Developing a Feature Extraction of Existing Structures Using an Ambient Vibration Test","authors":"H. Sarmast, H. Kazemi","doi":"10.22075/JRCE.2020.18982.1356","DOIUrl":"https://doi.org/10.22075/JRCE.2020.18982.1356","url":null,"abstract":"The paper aims to extract the dynamic properties of existing structures without utilizing the analytical models. The ambient vibration testing could be used on any type of frame such as concrete, steeland masonry to investigate the structural vulnerability.The method could bethe first stage and necessarily forthe retrofit process. To achieve this aim, the ambient vibration testing can also be employed. The experimental data obtained from the methodcan be used to monitor the health, evaluating, and damage detection structures at present. The achieved datacan be comparedin future with the recorded signals at different times.","PeriodicalId":52415,"journal":{"name":"Journal of Rehabilitation in Civil Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82562433","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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