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针对山地掉层结构在不同加载方式下的抗震性能,基于Pushover方法,分析了不同掉层层数和掉层跨数对掉层结构的影响以及掉层结构和平地结构抗震性能的区别;进一步针对掉层结构和平地结构,研究了Pushover分析结果与非线性动力时程分析结果的相关性,以及不同侧向加载模式下Pushover分析方法的适用性。结果表明:掉层层数和掉层跨数对掉层结构的抗震性能影响较大。掉层结构的掉层部分相比坎上部分破坏较轻,坎上1~3层梁端和上接地柱的塑性破坏最严重;随着掉层数和掉跨数的增加,坎上1层接地柱及与其相连的梁将在结构其它部位的梁柱端塑性未能充分发展前失去承载能力,使得结构达到推覆极限状态。掉层结构Pushover分析方法和时程分析方法的结果趋于一致,说明采用Pushover分析方法对掉层结构进行抗震性能评估是可行的。倒三角加载和指数加载模式会低估掉层部分的地震反应,对于掉层部分进行抗震性能评估时,宜采用均匀加载和MPA方法。
Based on the Pushover method, the influence of different stratum layers and stratum spalts on the stratum structure and the difference of seismic performance between stratum structure and stratum structure are analyzed. According to the seismic behavior of the stratum structure under different loading methods, Layered structure and the structure of the flat ground, the correlation between Pushover analysis results and nonlinear dynamic time-history analysis results and the applicability of Pushover analysis method in different lateral loading modes are studied. The results show that the number of delamination layers and the number of spans have a significant effect on the seismic performance of the layered structures. Lost part of the stratum structure is lighter than that of the stanchion part. The plastic damage of the beam ends and the ground studs on the level 1 to 3 of the crust is most serious. With the increase of number of stratums and number of stray spans, The grounding studs and the beams connected to them will lose their carrying capacity before the plasticity of the beam ends in other parts of the structure fails to fully develop so that the structure reaches the nappe limit state. Pushover analysis method and time-history analysis method of the stratum structure tend to be consistent, which shows that it is feasible to evaluate the seismic performance of the stratum structure by Pushover method. Inverted triangle loading and exponential loading modes underestimate the seismic response of the off-level section. For seismic evaluation of the off-level sections, uniform loading and MPA methods should be used.