基于刚度损伤的钢框架结构IDA抗震倒塌方法研究

Research on IDA anti-seismic collapse method of steel frame structure based on stiffness damage

结合刚度倒塌判定准则和增量动力分析(IDA)方法,提出了一种以刚度损伤作为结构损伤指标DM的IDA抗震倒塌判定方法。在刚度损伤中,分别从层间构件刚度损伤和结构整体刚度损伤两个方面出发,得到相应的IDA曲线簇及结构各层和整体的IDA曲线。再通过层间位移角、残余位移角、结构滞回耗能作为损伤指标得出IDA曲线,对不同指标的IDA倒塌判定准则做对比分析评估。研究结果表明:以层间构件刚度损伤Di和结构整体刚度损伤DT作为DM的IDA分析可以作为基于IDA抗震倒塌判定的损伤指标,能详细描述结构的损伤状况;在与其他损伤指标对比中,发现与层间位移角θ为损伤指标的IDA曲线轨迹和倒塌点相近,以层间残余位移角θr和滞回耗能E为DM的IDA分析方法偏于保守。

By combining stiffness collapse judgment criteria and incremental dynamic analysis(IDA)method,an IDA seismic collapse judgment method using stiffness damage as the structural damage index DM is proposed in this paper.In the stiffness damage,starting from the stiffness damage of the interlayer members and the overall stiffness damage of the structure,the corresponding IDA curve clusters and the IDA curves of each layer and the whole structure are obtained.Then,the IDA curve is obtained by using the displacement angle between the layers,the residual displacement angle,and the hysteretic energy of the structure as damage indicators,and the IDA collapse judgment criteria of different indicators are compared and evaluated.The research results show that(1)IDA analysis using interlayer member stiffness damage Di and structure overall stiffness damage DT as DM can be used as damage indicators based on IDA seismic collapse judgment,and can describe the damage status of the structure in detail.(2)In comparison with other damage indicators,it is found that the IDA curve trajectory and the collapse point with the interlayer displacement angleθas the damage index are similar,and the IDA analysis method with the interlayer residual displacement angleθr and hysteretic energy E as DM is conservative.