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增量动力分析方法(IDA)可以较为全面的评估结构的抗震性能,但需对结构进行大量的非线性时程分析,计算量巨大。该文将单向偏心结构的等效二自由度模型(EDDOF)应用于增量动力时程分析,提出了单向偏心结构的简化增量动力分析方法。然后选取20条实际地震记录和一栋5层偏心结构,基于等效二自由度模型和原型模型分别进行了增量动力时程分析,并比较分析了对应的IDA曲线和易损性曲线。结果表明:该文方法对单向偏心结构抗震性能评估有较高的精度,可以追踪结构从弹性阶段到防止倒塌各阶段的性态变迁全过程,并进行定量评估,且计算效率大幅提高。
The incremental dynamic analysis (IDA) can comprehensively evaluate the seismic performance of the structure, but a large number of nonlinear time-history analysis of the structure is required, which requires a large amount of calculation. In this paper, an equivalent two-degree-of-freedom model (EDDOF) of unidirectional eccentric structure is applied to incremental dynamic time history analysis, and a simplified incremental dynamic analysis method of unidirectional eccentric structure is proposed. Then 20 actual seismic records and a 5-layer eccentric structure are selected. Based on the equivalent two-degree-of-freedom model and the prototype model, incremental dynamic time-history analysis is carried out respectively. Corresponding IDA curves and vulnerability curves are compared and analyzed. The results show that the proposed method has high precision in evaluating the seismic performance of unidirectional eccentric structures. The method can track the whole process of the state transition from elastic stage to collapse prevention stage and quantitatively evaluate it, and the computational efficiency is greatly improved.