钢筋混凝土框架结构柱端屈服影响因素的识别  

Identification on Influencing Factor of Column Yielding for RC Frame Members

作　　者：高环 付明琴 张雪洁 Gao Huan;Fu Mingqin;Zhang Xuejie(School of Civil Engineering,Wuchang Institute of Technology,Wuhan 430065,China)

机构地区：[1]武昌工学院土木工程学院,武汉430065

出　　处：《特种结构》2018年第6期1-6,共6页Special Structures

摘　　要：针对框架结构在强震激励下所应形成的塑性区分布格局,以及为了保证该格局而应采取的柱抗弯能力增强措施形式及其取值水准前人均有研究,而从非弹性分析的逐时点的细部识别来分析影响柱端屈服的因素未见报道。本文设计了不同抗震等级的两个典型框架结构,通过分别分析每个框架各楼层柱子在不同地面运动输入下屈服时段内反穹点高度分布散点图以及不同时点柱子非弹性弯矩与屈服穹矩对比,得到非弹性反应过程中内力重分布导致的柱子上下端穹矩比例变化以及轴力不是导致柱端过多出现塑性铰的重要原因。此研究成果可对相关规范修订以及强柱弱梁系数构成有一定的参考作用。A lot of research has been done on the distribution pattern of plastic zone and the measures for column moment amplification with the quantitative level under strong earthquakes, but there is little research on influencing factors of column yielding by detail identification of the nonlinear dynamic analyses. In this two regular RC frame structures were strictly designed according to the current Chinese code. The distribution of height of inflection point in the yielding period was estimated and the comparison between the nonlinear moment and yielding moment under multiple sets of rare earthquakes was conducted. It is found that the random shift of height of inflection point due to internal force redistribution and the axial force decrease of the column is of no significant effect. This result is of reference value for the revision of related codes and the determination of composition of column moment amplification factor.

关 键 词：抗震钢筋混凝土框架 反弯点 轴力 柱端屈服 

分 类 号：TU375.4[建筑科学—结构工程]