地震作用下多层钢结构的抗力退化与倒塌预测

分析房屋结构的倒塌过程，使在某种程度上能预测强震作用下房屋的破坏状况，使所设计的房屋能满足“大震不倒”，故意义重大，判断结构倒塌危险程度，可以用抗力退化率作为指标，对于弹塑性地震反应，提出“机构坐标系”的概念，为不同破坏模式的框架结构提供一个统一的、易于判读抗力退化率的方法，数值分析和荷载试验的结果分析表明，对低层和多层钢框架来说，根据等效静力荷载作用下的弹塑性分析结果，可以简略地推断在水平地震作

Resistance Deterioration of and Prediction for the Collapse of Multi-story Steel Frames Subjected to Earthquakes

it is very important to analyze the collapse process of building structures in order to predict the damage of structures subjected to severe earthquakes, and prevent them from collapse. In this paper, the resistance deterioration is taken as a criterion to judge the damage degree of building structures.A "mechanism coordinates" is proposed here, by employing which it becomes easier to distinguish if the deterioration of frames with different collapse modes occurs and how large it may be.Research results show that the collapse possibility of multi-story steel frames subjected to horizontal earthquake can be predicted to some extend according to the inelastic analysis of the frames subjected to static loads.