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结合已有的规则结构分析结果,设置不同的掉层跨数、掉层数量的掉层结构,以逐步增量弹塑性时程分析(IDA)结果为依据,运用多模态Pushover法(MPA)和传统的Pushover法进行对比分析。结果表明:相对于规则框架结构,除MPA外,掉层结构的掉层部分在各类侧向力分布模式相对于IDA下的层间Pushover曲线有较大差异。SRSS分布下在掉一、二层位置,过高估计结构的响应。上接地层以上部位各侧向力下的层间Pushover曲线较IDA曲线误差较小。掉层的楼层的层剪力在上接地位置存在明显的突变。掉层跨数的改变对上部楼层弹塑性分析结果影响较小,但跨数的改变会改变同等烈度下结构的层间Pushover曲线和内力响应。与此同时,掉层跨数的增加会减轻“剪力突变”现象。伴随着掉层层数的增加,掉层部分均匀分布和倒三角分布与IDA下层间推覆曲线的差异会扩大。总之,相对于传统Pushover分析,MPA分析的结果更接近于相对准确值,需要进一步研究以提高精度。
According to the results of the regular structural analysis, different stratified structures with number of strata and number of strata were set up. Based on the incremental incremental elasto-plastic time-history analysis (IDA) and multi-modal Pushover (MPA) And the traditional pushover method for comparative analysis. The results show that, compared with the regular frame structure, except the MPA, there are great differences in the distribution pattern of the lateral layers of the layered structure relative to the layered Pushover curve under the IDA. SRSS distribution in the first and second floor position, overestimated the structure of the response. The layered pushover curve under the lateral force above the upper ground plane is less error than the IDA curve. Layer shear layer of the floor in the location of the ground there is a clear mutation. The change of the number of spans has little effect on the results of elasto-plastic analysis of the upper floors, but the change of span will change the inter-layer pushover curve and internal force response of the structure under the same intensity. In the meantime, the increase of cross-strands will reduce the phenomenon of “shear mutation”. With the increase of the number of layers, the difference between uniform distribution and inverted triangular distribution of the layer and the nappe curve between the lower layers of IDA will widen. In conclusion, compared with the traditional Pushover analysis, the result of MPA analysis is closer to the relative accurate value, and further research is needed to improve the accuracy.