火灾后T形型钢混凝土柱抗震性能试验研究  

Experimental Study on Seismic Behavior of T-Shaped Steel Reinforced Concrete Columns After Fire

作　　者：高展 高立堂[1] 李晓东[1] 许业清 杨超[1] GAO Zhan;GAO Litang;Ll Xiaodong;XU Yeqing;Yang Chao(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266033

出　　处：《结构工程师》2020年第3期134-140,共7页Structural Engineers

基　　金：国家自然科学基金项目(51178232/E080804)

摘　　要：对火灾后型钢混凝土T形柱的各项抗震性能指标进行探索.以受火时间、轴压比以及剪跨比作为影响因素,对6根型钢混凝土T形柱进行低周反复荷载试验,得出异形柱的滞回曲线、延性系数以及刚度退化曲线等力学性能.结果表明:异形柱在火灾后,其各项力学性能指标降低;增大轴压比,提高了异形柱初始刚度和强度,降低了位移延性系数,加速了后期的强度衰减和刚度退化;一定范围内提高剪跨比,异形柱的初始刚度、极限承载力和耗能性能随之下降,同时减缓了强度衰减的速度.In order to make a better exploration for various seismic performance indexes of steel concrete T columns after fire,the lowcyclic loading tests on 6 steel concrete T columns are carried out with fire time,axial compression ratio and shear span ratio as the influencing factors.The hysteretic curve,ductility coefficient and stiffness degradation curve of special-shaped columns are obtained.The results show that after the fire,the mechanical properties of the special-shaped columns decrease,and with the increase of the axial compression ratio,the initial stiffness and strength of the special-shaped column are increased,the ductility coefficient of displacement is reduced,and the strength attenuation and stiffness degradation in the later stage are both accelerated.With the increase of shear span ratio in a certain range,the initial stiffness,ultimate bearing capacity and energy dissipation performance of special-shaped columns will decrease,and the speed of strength attenuation will be slowed down.

关 键 词：型钢混凝土T形柱 火灾后 轴压比 剪跨比 抗震性能指标 

分 类 号：TU398.9[建筑科学—结构工程] TU352.11