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对掉层框架结构上接地柱采用三种常见的支座约束形式,通过改变掉层框架结构所掉跨数,共设计9个算例对山地掉层框架结构进行基于增量动力分析法的易损性分析。结果表明:当掉层结构所掉跨数占结构总跨数比例较大时,三种支座形式超过CP极限状态的概率接近;当掉层结构所掉跨数约占结构总跨数一半时,采用固接支座形式的结构超越CP极限状态的概率最小,抗倒塌性能最好;当使用固接支座形式时,掉层结构超过CP极限状态的概率最小,抗倒塌性能最好。建议当掉层结构所掉跨数较多时使用滑动支座;掉层结构所掉跨数较少时使用固接支座。
Three common forms of restraint for the grounding column on the frame of the staging frame are adopted. By changing the number of stray frames of the staging frame structure, a total of 9 examples are designed to analyze the stray frame structure of the mountain based on the incremental dynamic analysis Loss analysis. The results show that the probability of the three support forms exceeding the limit state of the CP is close to one when the ratio of the stray span to the total span of the structure is large. When the stray span of the stratum is about half of the total span of the structure , The structure adopting the fixed support forms the least probability of exceeding the CP limit state, and the anti-collapse performance is the best. When using the fixed support form, the probability of exceeding the CP limit state is the smallest and the anti-collapse performance is the best. It is recommended to use the sliding bearing when the number of stranding structures is larger than the number of strands, and to use the fixed bearing when there is less number of falling strands.