基于能量原理的钢筋混凝土框架结构倒塌分析

Collapse Analysis of Reinforced Concrete Frames Based on Energy Method

通过能量法对钢筋混凝土框架结构的倒塌作了分析。按照我国现行抗震规范及结构设计规范设计了四个层数分别为4,7,10和15层的框架结构,利用能量法对各框架结构按等效单自由度体系计算其滞回耗能,并考虑了多阶振型的影响。提出了根据推覆分析来近似求解框架结构梁柱构件的自身耗能能力。通过框架结构滞回耗能与自身耗能能力的比较,评估其抗倒塌能力。

An energy approach for the collapse analysis of reinforced concrete frames was presented. Four frames, which had 4,7,10 and 15 stories respectively were designed according to the current Chinese seismic provisions and structural design requirements. Equivalent single-degree-of-freedom （SDOF） systems were used to estimate the hysteretic energy demands of these frames in order to simplify the computational effort. The energy dissipation capacities of the beams and columns of the frames are approximately evaluated based on the pushover analysis. Compared the hysteretic energy input into structures by an earthquake with the energy absorption capacity of the structures, the seismic resistance behavior of the structures can be approximately assessed.