结构-地震动双随机的隔震结构倒塌鲁棒性分析

为分析基于结构及地震动双随机的隔震结构竖向连续倒塌鲁棒性,依据二次四阶矩可靠度理论提出随机鲁棒性指标,通过对比分析隔震结构考虑结构随机、地震动随机性以及同时考虑结构-地震动随机性的鲁棒性指标,揭示随机性对隔震结构竖向连续倒塌鲁棒性的影响,以及PGA对隔震结构抗竖向连续倒塌鲁棒性产生的作用.研究结果表明:基于可靠度的随机鲁棒性指标可定量评估隔震结构抗竖向连续倒塌能力;若仅考虑结构随机或地震动随机,均会高估结构抗竖向连续倒塌能力;此外,随PGA增大,结构抗竖向连续倒塌鲁棒性下降,强震作用下,隔震结构极可能发生竖向连续倒塌现象.

Robustness Analysis on Progressive Collapse of Isolation Structure Based on Double Randomness of Structure and Seismic Wave

To analyze the vertical collapse robustness of isolated structures, considering double randomness of structure and seismic wave, a random robustness index was proposed based on the reliability theory. Through analyzing and contrasting the random robustness indexes of different randomness, the influence of randomness on the vertical progressive collapse robustness of isolated structures was revealed. In addition, the influence of PGA on the vertical progressive collapse robustness of isolated structures was studied. And the following results were obtained: The random robustness index can be effectively used for quantitative evaluation of the vertical progressive collapse ability of isolated structures. If only considering random ness of structures or seismic wave, it may overestimate the ability of the structure. The robustness of the isolation structure decreases with the increase of PGA. Under strong seismic, isolation structures are more prone to vertical progressive collapse.