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上接地柱为山地掉层结构的薄弱部位,掉层结构的破坏模式表现为上接地柱的率先破坏。对普通框架、掉层框架、带拉梁的掉层框架和采取改进措施的带拉梁掉层框架4个算例进行大震弹塑性分析和易损性分析,对比各结构的破坏模式和改进措施的效果。结果表明:与普通框架结构相比,普通掉层框架抗倒塌能力较弱,上接地楼层柱延性需求很大,大震下率先发生破坏;增设拉梁对掉层框架结构的破坏模式有一定的影响,但效果不太理想,且增设拉梁不能提高结构的抗地震倒塌能力;采取改进措施的带拉梁掉层框架结构效果非常显著,破坏模式和抗地震倒塌能力接近于普通结构。
The earthing column is a weak part of the mountainous layer structure, and the failure mode of the layering structure is the first destruction of the earthing column. Four examples of ordinary frame, frame-out frame, frame with pull-out and frame with pull-beam were adopted to analyze the elasto-plasticity and vulnerability of large-scale earthquake and to compare the failure mode and improvement of each structure The effect of the measure. The results show that compared with the common frame structure, the common frame structure has a weak ability of anti-collapse, and the columnar ductility of the upper ground floor is in great demand, and the first failure occurs under the earthquake. But the effect is not very good. Moreover, the addition of tension beam can not improve the seismic collapse resistance of the structure. The improvement of the structure with the tension beam is very significant, and the collapse mode and anti-seismic collapse ability are close to the ordinary structure.