基于平面框架拟静力试验的RC框架柱的破坏模式研究  

Failure mode of RC frame columns based on the plane frame quasi-static test

作　　者：范晓庆 郭迅 刘爱文[1] 李祥秀[1] FAN Xiaoqing;GUO Xun;LIU Aiwen;LI Xiangxiu(Institute of Geophysics,CEA,Beijing 100081,China;Key Laboratory of Building Collapse Mechanism and Disaster Prevention,CEA,Sanhe 065201,Hebei,China)

机构地区：[1]中国地震局地球物理研究所,北京100081 [2]中国地震局建筑物破坏机理与防御重点实验室,河北三河065201

出　　处：《地震工程学报》2022年第5期1074-1081,共8页China Earthquake Engineering Journal

基　　金：国家自然科学基金(52278489);中国地震局地球物理研究所基本科研业务费专项(DQJB22X09)。

摘　　要：以2008年汶川地震中漩口中学倒塌的教学楼中的钢筋混凝土柱为原型,按照1∶4的比例进行缩尺,通过平面框架拟静力试验对不同剪跨比下RC框架柱的破坏模式进行研究。设计3组不同剪跨比(λ=3、λ=4.25及λ=6)的RC框架柱模型。采用拟静力试验对RC框架柱进行加载,得到RC框架柱的滞回曲线、骨架曲线以及不同的破坏模式,定义RC框架柱抗剪承载力与轴力之比为抗震性能系数α。利用3组试验数据,总结基于抗震性能系数α的RC框架柱破坏规律:当抗震性能系数α<0.16时,RC框架柱发生弯曲破坏,而当α≥0.16时,其发生剪切破坏。因此,在RC框架柱的抗震设计中应重视抗震性能系数α的取值,避免柱发生剪切脆性破坏。文章对应变计算剪力的3种方法进行比较,得出线性情况下有效的剪力计算方法,即在试验中通过实测的应变信息反演出RC框架柱端真实受力状态。To study the failure mode of reinforced concrete(RC)frame columns under different shear-span ratios,on the basis of the RC columns in Xuankou middle school that collapsed during the Wenchuan earthquake in 2008,a 1:4 RC column model was designed and constructed,and the plane frame quasi-static test was conducted.Three sets of RC frame column models with different shear-span ratios(λ=3,λ=4.25,andλ=6)were designed.The hysteresis curves,skeleton curves,and different failure modes of the RC frame column were obtained through a quasi-static test,and the ratio of shear bearing capacity to axial force of the RC frame column was defined as the seismic performance coefficientα.With the use of three sets of test data,the failure rule of the RC frame column based on the seismic performance coefficientαwas summarized:Whenα<0.16,flexure failure happens on the RC frame column;whenα≥0.16,shear failure happens on the RC frame column.If the value ofαis well grasped in the seismic design of the RC frame column,then the shear and brittle damage of the column can be avoided.In addition,three methods for calculating the shear force from strain were compared,and an effective shear force calculation method in the linear case was obtained;that is,the actual stress state at the end of the RC frame column was retrieved by the measured strain information.

关 键 词：拟静力试验 破坏模式 平面框架 RC框架柱 抗震性能系数 

分 类 号：TU375.3[建筑科学—结构工程]