近断层轴向速度地震效应对RC柱抗剪性能的影响分析  

Shear Resistant Performance of RC Columns Subjected to Axial Near-Fault Velocity Pulse-Like Earthquake Action

作　　者：周靖[1,2] 田淞午[1] 赵卫锋[1] 

机构地区：[1]湘潭大学土木工程与力学学院,湖南湘潭411105 [2]华南理工大学,广东广州510641

出　　处：《湘潭大学自然科学学报》2012年第2期36-40,共5页Natural Science Journal of Xiangtan University

基　　金：湘潭大学自然科学基金项目(09XZX26);湖南省研究生创新基金项目(CX2010B270);教育部高等学校博士学科点专项科研基金项目(20094301120001)

摘　　要：研究近断层轴向速度脉冲地震效应对钢筋混凝土(RC)柱抗剪性能的影响.以竖向和水平向恒定振动周期的单个RC柱为分析对象,采用台湾集集地震中3组断层距18条速度脉冲型地震动记录,通过非线性动力时程分析方法,研究断层距、竖向与水平加速度谱值比、柱初始轴压比和剪跨比对RC柱抗剪性能的影响规律.结果表明:轴向速度脉冲地震效应对RC柱的抗剪性能有很大影响;抗剪性能系数随反应谱比值增大而减小,中等初始轴压比与断层距,以及剪跨比与近断层距(0～10km)对柱抗剪性能有交互影响.The shear-resistant behavior of reinforced concrete （RC） columns subjected to axial velocity pulse-like earthquake action is studied. Single RC columns with the constant vertical and horizontal fundamental period are used to investigate the influence of fault distance, vertical and horizontal acceleration spectral ratio, initial axial load ratio and shear span ratio on shear resistant behavior of RC columns. Eighteen velocity pulse-like earthquake records divided into three fault distance from CHI-CHI earthquake are taken as excitations to execute nonlinear dynamic time history analysis. The results demonstrate that axial velocity pulse-like earthquake action has evident effects on the shear resistant performance of RC columns. Shear-resistant behavior factor decreases with increasing in spectral ratio, and medium initial axial load ratio and fault distance, shear span ratio and near fault distance （0-10 km） have coupling influence on the shear-resistant behavior of RC columns.

关 键 词：轴向速度脉冲地震 钢筋混凝土柱 抗剪需求 抗剪承载力 断层距 

分 类 号：TU317[建筑科学—结构工程]