延性桥墩纵筋失稳长度的简化表达式

Analytical Method of Buckling Length of Longitudinal Reinforcement for RC Flexural Bridge Piers

为了评估钢筋混凝土桥墩的极限水平位移,根据塑性铰区变形特性,合理确定塑性铰区长度是非常重要的.基于有限元分析,从理论上给出了桥墩根部纵筋失稳时的长度,并与实验结果进行了比较.通过纵筋失稳分析结果,提出了考虑到材料非线性时桥墩纵筋失稳长度的简化表达式.使用该表达式,可简单推算反复荷载作用下的钢筋混凝土桥墩纵筋失稳长度.

In order to assess the ultimate displacement of reinforced concrete columns based on the deformation characteristics in plastic hinge region, it is very important to determine the plastic hinge length reasonably. This paper presents the analytical studies on buckling of longitudinal reinforcement in columns with use of the FEM analyses and compares the theoretical buckling length with that obtained from the column loading tests. Furthermore, the simplified procedure for assessing the buckling length of longitudinal reinforcement with taking account of the inelastic behavior is proposed based on the analytical studies.