不同约束条件下压弯柱滞回性能比较分析

Comparative Study of Boundary Condition Effects on Hysteretic Characteristics of Columns in Cyclic Loading Test

摘要:

对结构构件滞回性能试验中不同约束条件的等效性进行研究.以5个型钢混凝土柱的拟静力试验为考察对象,其边界约束条件分别为两端固支与两端铰支,对比了试件骨架曲线形状、控制点以及滞回曲线特征,并结合力学模型进行数值分析.研究表明,不同约束条件对试件的承载力以及相对变形影响不大,但约束条件非理想化对试件的初始刚度、骨架曲线形状以及耗能能力有一定的影响.

Abstract:

Cyclic loading tests on structural members are carried out on different boundary conditions.The equivalence of the boundary condition is discussed by analyzing the results of 5 steel reinforced concrete(SRC) columns subject to cyclic loadings,which are respectively fixed at two ends or pin-restrained at two ends.A comparative study is made on the skeleton curves,key points and characteristics of hysteretic curves of specimens on different boundary conditions .Based on the numerical analysis of the mechanical model,the phenomena of test results are explained.The study shows that boundary condition has no evident effect on the ultimates and deformation capacity,however nonideal boundary restraint has certain influence on the initial stiffness,shape of the skeleton curve and energy dissipation capacity.