钢筋混凝土桥墩刚度和强度折减系数确定  

Determination of the strength and stiffness degradation factors for circular RC bridge piers

作　　者：李永哲[1] 阎贵平[1] 鞠彦忠[1] 

机构地区：[1]北京交通大学土建学院,北京100044

出　　处：《世界地震工程》2005年第1期140-145,共6页World Earthquake Engineering

摘　　要：目的是解析地预测钢筋混凝土桥墩在反复荷载作用下的非线性滞回特性。使用实验中得到的力-位移滞回曲线,对随轴压比,配筋率和配箍率的变化而变化的刚度和强度折减系数,进行了回归分析,并提出了其表达式。按照提出的理论力-位移滞回模型,能够预测现存钢筋混凝土桥墩的刚度和强度折减情况。This paper is to analytically predict nonlinear hysteretic behavior of RC bridge piers subjected to repeated loads. Considering the nonlinear behavior of reinforced concrete, the neutral axis of RC section is repeatedly computed at each stepwise load. Then, the moment capacity and corresponding curvature in the plastic hinge are determined, and the enhanced hysteretic behavior model is proposed by five different kinds of branches for modeling the stiffness variation of RC section under cyclic loading. Based on the experimental force-displacement curve, the analytical hysteretic model of the stiffness and strength degradation is obtained through the linear regression analysis on the effects of axial force ratio, longitudinal steel ratio, confinement steel ratio and etc.

关 键 词：强度折减系数 刚度 滞回模型 滞回特性 轴压比 滞回曲线 配箍率 钢筋混凝土桥墩 反复荷载作用 位移 

分 类 号：P315[天文地球—地震学] TU375[天文地球—固体地球物理学]