The Experts below are selected from a list of 4971 Experts worldwide ranked by ideXlab platform
Togay Ozbakkaloglu - One of the best experts on this subject based on the ideXlab platform.
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behavior of square fiber reinforced polymer high strength concrete steel double skin tubular columns under combined axial compression and reversed cyclic Lateral loading
Engineering Structures, 2016Co-Authors: Yunita Idris, Togay OzbakkalogluAbstract:Abstract This paper presents an experimental study on seismic behavior of square fiber reinforced polymer (FRP)–concrete–steel columns. Six hybrid double-skin tubular columns (DSTCs) manufactured using high-strength concrete (HSC) were tested under combined axial compression and reversed-cyclic Lateral loading. The main parameters under investigation were the axial load level, size of inner steel tube, provision (or absence) of a concrete-filling inside the steel tube, and the column aspect ratio. The results indicate that, in general, square DSTCs exhibit very ductile behavior under combined axial compression and reversed-cyclic Lateral loading. However, the important influence of the axial load level on the column behavior is evident, with an increase in the load level leading to a significant decrease in the Lateral Deformation capacity of DSTCs. The results also indicate that a DSTC with a larger inner steel tube exhibits lower Lateral displacement capacity than that of a companion DSTC with a smaller inner steel tube. It is shown, however, that provision of a concrete-filling inside the inner steel tube leads to a significant increase in the Lateral Deformation capacity of a DSTC with a larger inner steel tube to a level that is higher than that seen in a companion DSTC with a smaller hollow inner steel tube. Experimental results are presented together with accompanying discussions on the influence of the investigated parameters on the seismic behavior of square DSTCs.
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Behavior of square fiber reinforced polymer–high-strength concrete–steel double-skin tubular columns under combined axial compression and reversed-cyclic Lateral loading
Engineering Structures, 2016Co-Authors: Yunita Idris, Togay OzbakkalogluAbstract:Abstract This paper presents an experimental study on seismic behavior of square fiber reinforced polymer (FRP)–concrete–steel columns. Six hybrid double-skin tubular columns (DSTCs) manufactured using high-strength concrete (HSC) were tested under combined axial compression and reversed-cyclic Lateral loading. The main parameters under investigation were the axial load level, size of inner steel tube, provision (or absence) of a concrete-filling inside the steel tube, and the column aspect ratio. The results indicate that, in general, square DSTCs exhibit very ductile behavior under combined axial compression and reversed-cyclic Lateral loading. However, the important influence of the axial load level on the column behavior is evident, with an increase in the load level leading to a significant decrease in the Lateral Deformation capacity of DSTCs. The results also indicate that a DSTC with a larger inner steel tube exhibits lower Lateral displacement capacity than that of a companion DSTC with a smaller inner steel tube. It is shown, however, that provision of a concrete-filling inside the inner steel tube leads to a significant increase in the Lateral Deformation capacity of a DSTC with a larger inner steel tube to a level that is higher than that seen in a companion DSTC with a smaller hollow inner steel tube. Experimental results are presented together with accompanying discussions on the influence of the investigated parameters on the seismic behavior of square DSTCs.
Kohji Tokimatsu - One of the best experts on this subject based on the ideXlab platform.
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evaluation of earth pressure under any Lateral Deformation
Soils and Foundations, 1998Co-Authors: Jianmin Zhang, Yasuhiro Shamoto, Kohji TokimatsuAbstract:Strong dependence of earth pressure coefficient on strain increment ratio was revealed based on triaxial loading tests along different constant strain paths. From this finding, a new methodology was developed for solving earth pressure problems under any boundary strain constraint. Using this method, new earth pressure equations were obtained by extending the formulas of Rankine and Coulomb theories. The equations proposed can be used to determine Lateral earth pressures due to normally consolidated cohesionless soil for any Lateral Deformation between the active and passive states of stress, including the state of rest. Pragmatic charts corresponding to several simple cases were provided for actual design. Simplified methods were also suggested to determine the parameters in the proposed equations and to evaluate the earth pressures for different types of Lateral Deformation.
Yunita Idris - One of the best experts on this subject based on the ideXlab platform.
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behavior of square fiber reinforced polymer high strength concrete steel double skin tubular columns under combined axial compression and reversed cyclic Lateral loading
Engineering Structures, 2016Co-Authors: Yunita Idris, Togay OzbakkalogluAbstract:Abstract This paper presents an experimental study on seismic behavior of square fiber reinforced polymer (FRP)–concrete–steel columns. Six hybrid double-skin tubular columns (DSTCs) manufactured using high-strength concrete (HSC) were tested under combined axial compression and reversed-cyclic Lateral loading. The main parameters under investigation were the axial load level, size of inner steel tube, provision (or absence) of a concrete-filling inside the steel tube, and the column aspect ratio. The results indicate that, in general, square DSTCs exhibit very ductile behavior under combined axial compression and reversed-cyclic Lateral loading. However, the important influence of the axial load level on the column behavior is evident, with an increase in the load level leading to a significant decrease in the Lateral Deformation capacity of DSTCs. The results also indicate that a DSTC with a larger inner steel tube exhibits lower Lateral displacement capacity than that of a companion DSTC with a smaller inner steel tube. It is shown, however, that provision of a concrete-filling inside the inner steel tube leads to a significant increase in the Lateral Deformation capacity of a DSTC with a larger inner steel tube to a level that is higher than that seen in a companion DSTC with a smaller hollow inner steel tube. Experimental results are presented together with accompanying discussions on the influence of the investigated parameters on the seismic behavior of square DSTCs.
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Behavior of square fiber reinforced polymer–high-strength concrete–steel double-skin tubular columns under combined axial compression and reversed-cyclic Lateral loading
Engineering Structures, 2016Co-Authors: Yunita Idris, Togay OzbakkalogluAbstract:Abstract This paper presents an experimental study on seismic behavior of square fiber reinforced polymer (FRP)–concrete–steel columns. Six hybrid double-skin tubular columns (DSTCs) manufactured using high-strength concrete (HSC) were tested under combined axial compression and reversed-cyclic Lateral loading. The main parameters under investigation were the axial load level, size of inner steel tube, provision (or absence) of a concrete-filling inside the steel tube, and the column aspect ratio. The results indicate that, in general, square DSTCs exhibit very ductile behavior under combined axial compression and reversed-cyclic Lateral loading. However, the important influence of the axial load level on the column behavior is evident, with an increase in the load level leading to a significant decrease in the Lateral Deformation capacity of DSTCs. The results also indicate that a DSTC with a larger inner steel tube exhibits lower Lateral displacement capacity than that of a companion DSTC with a smaller inner steel tube. It is shown, however, that provision of a concrete-filling inside the inner steel tube leads to a significant increase in the Lateral Deformation capacity of a DSTC with a larger inner steel tube to a level that is higher than that seen in a companion DSTC with a smaller hollow inner steel tube. Experimental results are presented together with accompanying discussions on the influence of the investigated parameters on the seismic behavior of square DSTCs.
Jianmin Zhang - One of the best experts on this subject based on the ideXlab platform.
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evaluation of earth pressure under any Lateral Deformation
Soils and Foundations, 1998Co-Authors: Jianmin Zhang, Yasuhiro Shamoto, Kohji TokimatsuAbstract:Strong dependence of earth pressure coefficient on strain increment ratio was revealed based on triaxial loading tests along different constant strain paths. From this finding, a new methodology was developed for solving earth pressure problems under any boundary strain constraint. Using this method, new earth pressure equations were obtained by extending the formulas of Rankine and Coulomb theories. The equations proposed can be used to determine Lateral earth pressures due to normally consolidated cohesionless soil for any Lateral Deformation between the active and passive states of stress, including the state of rest. Pragmatic charts corresponding to several simple cases were provided for actual design. Simplified methods were also suggested to determine the parameters in the proposed equations and to evaluate the earth pressures for different types of Lateral Deformation.
Pilate Moyo - One of the best experts on this subject based on the ideXlab platform.
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Lateral Deformation of rc beams under simultaneous load and steel corrosion
Construction and Building Materials, 2010Co-Authors: Goitseone Malumbela, M G Alexander, Pilate MoyoAbstract:Abstract Cracking of cover concrete due to steel corrosion is one of the clear physical indicators of loss of service life of corroding RC structures. Its prediction is therefore very important for service life modelling of these structures. Models developed to predict the time to cover cracking assume that stresses due to steel corrosion follow the principles of a thick-walled cylinder under internal pressure. Considering the errors in the models, this paper contests the applicability of the thick-walled cylinder approach to model the time to cover cracking as well as the rate of Lateral expansion of concrete after cover cracking using experimental results from 12 RC beams (153 × 254 × 3000 mm) corroded under a sustained load. It is shown in the paper that, contrary to the assumptions of uniform expansion made in the thick-walled cylinder approach, before cracking of the cover concrete, tensile strains are applied on the face of beams where corrosion agents are drawn whilst other faces are in compression. Corroded steel coupons are used to verify that this variation of strains is caused by the corrosion process not being uniformly distributed around the steel bar. It is also shown in the paper how cracking and location of cracks affects the rate of Lateral Deformation of concrete due to steel corrosion.
