【摘要】 该文建立了一种考虑结构地震反应滞回变形幅值对累积耗能损伤影响的双参数损伤模型,提出了一种基于易损性分析的评估钢结构在地震作用下损伤程度的方法,该方法以结构最大层间位移角作为评价结构整体能力的参数指标。以一个9层Benchmark钢结构为例,针对其在强震中的反应特征,对其薄弱层进行了优化设计,建立其优化前后的理论易损性曲线,对其在不同强度地震作用下的破坏状态进行评估。基于倒塌储备系数对优化前后结构的抗倒塌性能进行分析,结果表明:所提出的损伤评估方法能较准确地评估钢结构在强震作用下的损伤程度,优化设计后结构的抗倒塌能力显著提高。更多还原

【Abstract】 An improved two-parameter damage model is established by considering the effect of hysteretic deformation amplitude to accumulative damage energy dissipation.A new method of seismic damage assessment based on vulnerability analysis is proposed and the maximum inter-story drift angle is taken as the variable index to evaluate the global performance of structures.According to the response characteristics of a 9-story benchmark steel model structure under strong earthquakes,the optimization design is made to the weak stories and the theoretical vulnerability curves of the original steel frame structure and the one after optimization are obtained respectively,the damage status of the structures under different intensity earthquakes are evaluated.The analysis of structural anti-collapse capability on both structures is conducted based on Collapse Margin Ratio and results indicate that the proposed method can accurately evaluate the damage of a steel structure under strong earthquakes,and the anti-collapse capability of the optimized structure is improved largely.更多还原