On the descending branch of the pushover curve for multistory buildings
On the descending branch of the pushover curve for multistory buildings
复制标题
多层建筑推覆曲线的下降分支
DOI：
10.1002/eqe.2990
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
J. F. Hall
中科院分区：
文献类型：
--
作者：
J. F. Hall
本文讨论了多层框架结构的非线性推覆曲线。注意到弹性卸载对pushover曲线下降分支斜率的陡化效应，并有可能发生回弹。位移控制被证明是有效的推覆分析的整个范围内，包括下降分支。该方法通过控制倒塌机构附近2层的位移差而不是控制顶板位移来增强。一个自动漂移控制版本的描述和测试。对一栋20层建筑的分析表明，塑性铰强度的变化以及重力式框架的强度和刚度对推覆曲线的影响很大，尤其是下降分支。描述了动态推覆的概念，并将结果与静态版本进行了比较。
The paper discusses nonlinear pushover curves for multistory moment‐frame buildings. Attention is brought to the steepening effect that elastic unloading has on the slope of the descending branch of the pushover curve, with the possibility of snapback. Displacement control is shown to be effective for the entire range of pushover analysis, including the descending branch. The method is enhanced by controlling the difference in displacement of 2 floors in the vicinity of the collapse mechanism rather than, say, controlling the roof displacement. An automated drift control version is described and tested. Analysis of a 20‐story building demonstrates that variable strength of plastic hinges and inclusion of the strength and stiffness of the gravity frames in the model affect the pushover curve significantly, especially the descending branch. The concept of dynamic pushover is described, and results are compared with the static version.