考虑梁端耗能能力影响的钢框架结构易损性分析

Vulnerability analysis of steel frame structures considering energy dissipation capacity of beam end

一般采用梁柱焊接节点钢框架结构在遭遇强烈地震地震作用下,结构倒塌破坏可能由于是耗能能力不足所导致。以某钢框架结构为算例,选取20条实际地震动记录,对结构进行易损性分析,对比不同损伤指标和不同梁端构造形式的钢框架结构抗震性能差异。研究显示:对梁柱焊接的普通钢框架结构,其倒塌破坏是由于结构耗能能力不足所导致的,评价结构抗震性能不仅需考虑结构变形能力,尚需同时考虑结构耗能能力;对于改进形式的钢框架结构,结构耗能能力得到显著提高,使得位移首超破坏先于累积损伤破坏,此时基于变形的评价结果更加可靠。

Lack of energy dissipation capacity,the steel frame structure using welded beam-to-column joints might be damaged under strong earthquakes..Taking a steel frame structure as an example,20 actual ground motion records are selected to analyze the vulnerability of the steel frame structure.The study shows that the collapse and failure of the ordinary steel frame structure using welded beam-to-column joints is caused by the lack of structural energy dissipation capacity.In addition to the structural deformation capacity,the energy dissipation capacity should be taken into account for evaluating the seismic performance of the structure.In the improved steel frame structure,the energy dissipation capacity is significantly improved.The displacement-based failure occurs before the cumulative damage-based failure,and in this case,the evaluation results based on deformation are more reliable.