地震作用下基于节点弯矩平衡方式的框架柱屈服机理分析

Study on Yielding Mechanism of Frame Column Based on Moment Equilibrium Manner of Joint under Earthquake

通过对平面框架在地震作用下的弹性、非弹性动力反应分析结果的讨论 ,说明了框架中间层节点处可能形成的各种弯矩平衡方式 ,并根据框架的变形和受力特点 ,对这类节点处弯矩平衡方式发生变化的内在原因进行了分析。在讨论了影响中间层外节点和内节点处弯矩平衡方式发生变化的各因素的异同之后 ,基于可能形成的各种节点弯矩分布形式 ,分析了控制框架不同部位的柱在地震作用下不进入屈服的抗震设计方法。

In this paper, by discussion of elastic and nonlinear dynamic response of a plane frame subjected to ground motion, various possible moment equilibrium manners of middle floor joint of frame are explained. The intrinsic reason of the change of moment equilibrium manner is studied on the basis of the displacement and mechanical characteristics of the frame. The similarities and differences of the factors resulting in the change of moment equilibrium manner between interior and exterior joints of middle floor are analyzed. Based on the various possible moment equilibrium manner, the unyielding control method of frame column located on different structure position subjected to ground motion is studied.