带防屈曲消能杆的自复位钢柱脚抗震性能试验  

Experimental study on seismic performance of self-centering steel column base with buckling-restrained bar

作　　者：沈培文 杨溥[1,2] 胡金成 杨熠明 SHEN Peiwen;YANG Pu;HU Jincheng;YANG Yiming(School of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Lab of New Technology for Construction of Cities in Mountain Area(Chongqing University),Ministry of Education,Chongqing 400045,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]山地城镇建设与新技术教育部重点实验室(重庆大学),重庆400045

出　　处：《哈尔滨工业大学学报》2021年第4期187-194,共8页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51578093);重庆市自然科学基金(cstc2018jcyjAX0061)。

摘　　要：提出带防屈曲消能杆的自复位钢柱脚,对其受力机理进行了分析。将自复位参数(β_(sc))和框架柱轴力作为设计变量,设计制作了四组柱脚试件,通过低周往复荷载试验,对比分析了结构的受力发展过程、自复位能力、变形能力和耗能能力。结果表明:柱脚试件的塑性变形集中于消能杆,对损伤的消能杆更换后,柱脚抗震性能得以快速恢复,实现了预期的设计意图;试件的荷载-位移滞回曲线为典型的“双旗帜”形,卸载后最大残余层间位移角仅为0.001 rad,具有良好的自复位能力;通过对位移延性系数和等效黏滞阻尼系数的分析,表明自复位柱脚具有良好的变形能力和耗能能力;随着βsc参数增大,柱脚自复位能力提高,承载力和耗能能力降低,而对变形能力影响不大;随着框架柱轴力增大,自复位能力和承载力提高,变形能力降低,而对耗能能力影响不大。A self-centering steel column base with buckling-restrained bar was proposed,and its stress mechanism was analyzed.The self-centering parameter(β_(sc))and axial force of column were used as design parameters,and four specimens were designed and manufactured.Low cyclic loading test was conducted to compare and analyze the load transfer mechanism,self-centering capability,deformation capability,and energy dissipation capability of the specimens.Test results show that the plastic deformation of the specimens was concentrated on the buckling-restrained bars,and the seismic performance of the structure could be quickly restored by replacing the damaged buckling-restrained bars,indicating that the design intention was realized.The load-displacement hysteretic curves of the specimens were“double flag-shaped”,and the residual story drift was only 0.001 rad after unloading,which means the structure had good self-centering capability.Analysis on the displacement ductility coefficient and equivalent viscous damping coefficient showed that the structure had good deformation capability and energy dissipation capability.With the increase ofβsc,the self-centering capability of the column base increased,and the bearing capability and energy dissipation capability decreased,while the deformation capability was less affected.With the increase of the axial force of the column,the self-centering capability and bearing capability increased,and the deformation capability decreased,while the energy dissipation capability was less affected.

关 键 词：钢柱脚 自复位 消能杆 拟静力试验 抗震性能 

分 类 号：TU391[建筑科学—结构工程]