钢筋混凝土柱荷载-变形计算的理论模型

为得到轴向荷载及水平荷载作用下钢筋混凝土柱的荷载-变形曲线,利用简化的修正压力场理论描述剪切特性以及符合平截面假定的弯曲理论描述弯曲特性,并认为柱端产生的总水平变形主要由弯曲变形、剪切变形和钢筋滑移引起的变形组成,提出了一种分析轴向荷载及水平荷载作用下钢筋混凝土柱荷载-变形的新方法,它可模拟钢筋混凝土柱弯曲破坏、弯剪破坏和剪切破坏的过程;最后将荷载-变形计算结果与15根矩形柱的低周反复荷载试验结果进行了对比分析。研究结果表明:按本文方法计算的荷载-变形计算结果与滞回曲线的外包线基本一致,可用于轴向荷载和水平荷载作用下钢筋混凝土柱的荷载-变形性能分析。

Theoretical Models of Load-deformation Calculation for Reinforced Concrete Columns

To get load-deformation relationship for reinforced concrete columns subjected to combined action of axial load and lateral load,a new method was developed using simplified modified compression field theory(MCFT) to describe shear behavior,using conventional section analysis to describe flexure behavior,and considering that the total lateral deformation of a column at its ends was comprised of deformations due to flexure,shear and reinforcement slip.The load-deformation courses of reinforced concrete columns failing in flexural failure,flexure-shear failure and shear failure were presented in this method.Finally,the calculation results of load-deformation in the paper were compared with the results of 15 rectangular columns from various low-cycle reverse loading tests.Study results show that the model predicted the load-deformation response envelop reasonably well,so it can be used in load-deformation analysis for reinforced concrete columns subjected to combined action of axial load and lateral load.