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Influence of Unconstrained Segments on Hysteretic Energy Dissipation Performance of Buckling-restrained Braces with H-section Core

DU Lei;CHEN Zhong;ZHOU Ming-ru;ZHANG Tai-liang;School of Civil Engineering,Lanzhou University of Technology;Gansu Science Research Institute of Civil Engineering;  
12different buckling-restrained braces with unconstrained segments were designed,and finite element analysis was carried by ABAQUS software to study the influences of unconstrained length,whether the channel strengthened unconstrained segment or not,and the channel with different lengths and thicknesses on the hysteretic energy dissipation and bearing capacity of components.The results show that the length of the unconstrained segment has a significant influence on the hysteretic energy dissipation performance and bearing capacity.The influence of energy dissipation is more obvious when the length of unconstrained segment is equal to the maximum displacement of component under axial force.The components strengthened by channels have good hysteretic performance and bearing capacity.The length of unconstrained segment strengthened by the channel has obvious influence on the hysteretic energy dissipation performance and bearing capacity. When the channel length is 2times than unconstrained segment length,the components have better energy dissipation and bearing capacity.Strengthening channel thickness has little effect on the hysteretic behavior and bearing capacity ofcomponents,so the thickness of the channel can be reduced in design to improve the utilization rate of materials.
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