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CONTENTS
Volume 0, Number 23, August 2022
 


Abstract
In most self-center braces, decreasing residual deformation is possible only by increasing pretension force, which results in lower energy dissipation capacity. On the other hand, increasing energy dissipation capacity means higher values of residual deformation. The goal of this research was to find the best design for a self-centering buckling restrained brace (SCBRB) system by balancing self-centering capability and energy dissipation. Three, six, and nine-story structures were investigated using OpenSees software and the TCL programming language to achieve this goal. For each height, 62 different SC-BRBs were considered using different values for the pretension force of cables, the area of the buckling restrained brace (BRB) core plate, and the yield stress of the core plate. The residual deformation and dissipated energy of all the models were calculated using nonlinear analyses after cyclic loading was applied. The optimum design for each height was determined among all the models and was compared to the structure equipped with the usual BRB. The residual deformation of the framed buildings was significantly reduced, according to the findings. Also the reduction of the energy dissipation was acceptable. The optimum design of SC-BRB in 6-story building has the most reduction percent in residual deformation, it can reduce residual deformation of building 83% while causing only a 57% of reduction in dissipated energy. The greatest reduction in residual deformation versus dissipated energy reduction was for the optimum SC-BRB design of 9-story building, results indicated that it can reduce residual deformation of building 69% while causing only a 42% of reduction in dissipated energy

Key Words
buckling restrained brace; dual steel moment resisting system; energy absorption self-centering; optimum design; residual deformation

Address
Mohammadreza Ahadpour Khaneghah: School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran

Esmaeil Mohammadi Dehcheshmaeh: School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran

Vahid Broujerdian: School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran

Gholamreza Ghodrati Amiri: Natural Disasters Prevention Research Center, Iran University of science and Technology, Tehran, Iran

Abstract
In most self-center braces, decreasing residual deformation is possible only by increasing pretension force, which results in lower energy dissipation capacity. On the other hand, increasing energy dissipation capacity means higher values of residual deformation. The goal of this research was to find the best design for a self-centering buckling restrained brace (SCBRB) system by balancing self-centering capability and energy dissipation. Three, six, and nine-story structures were investigated using OpenSees software and the TCL programming language to achieve this goal. For each height, 62 different SC-BRBs were considered using different values for the pretension force of cables, the area of the buckling restrained brace (BRB) core plate, and the yield stress of the core plate. The residual deformation and dissipated energy of all the models were calculated using nonlinear analyses after cyclic loading was applied. The optimum design for each height was determined among all the models and was compared to the structure equipped with the usual BRB. The residual deformation of the framed buildings was significantly reduced, according to the findings. Also the reduction of the energy dissipation was acceptable. The optimum design of SC-BRB in 6-story building has the most reduction percent in residual deformation, it can reduce residual deformation of building 83% while causing only a 57% of reduction in dissipated energy. The greatest reduction in residual deformation versus dissipated energy reduction was for the optimum SC-BRB design of 9-story building, results indicated that it can reduce residual deformation of building 69% while causing only a 42% of reduction in dissipated energy

Key Words
buckling restrained brace; dual steel moment resisting system; energy absorption self-centering; optimum design; residual deformation

Address
Mohammadreza Ahadpour Khaneghah: School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran

Esmaeil Mohammadi Dehcheshmaeh: School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran

Vahid Broujerdian: School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran

Gholamreza Ghodrati Amiri: Natural Disasters Prevention Research Center, Iran University of science and Technology, Tehran, Iran


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