超长复杂隔震结构抗连续倒塌性能分析

Analysis on progressive collapse resistance of long complicated isolated structures

以某医院的超长复杂隔震结构为工程背景,对超长复杂隔震结构进行了抗连续倒塌研究。运用非线性有限元软件建立考虑楼板作用的精细三维模型和未考虑楼板作用的简化三维模型,通过非线性动力拆除构件法对两种模型进行了分析,对比两种模型的抗倒塌能力。结果表明:该超长复杂隔震结构仅拆除1根柱时,结构未发生连续倒塌,且角柱对该隔震结构的连续倒塌影响较大;拆除2根柱时,未考虑楼板作用的简化三维模型发生了连续倒塌,而考虑楼板作用的精细三维模型未发生连续倒塌。因此,不考虑楼板作用的简化三维模型计算结果会偏于保守,进行结构抗连续倒塌时需考虑楼板的影响。

To study the progressive collapse resistance of the long period complicated isolated structure,an actual hospital building was analyzed and discussed comprehensively. Two finite element models,viz. refined 3D FE model with slab and simplified 3D FE model without slab,were established for this hospital building. Nonlinear dynamic alternate path method was performed for the two models to investigate the progressive collapse resistance. The results show that the progressive collapse does not occur for the case of removing only one vertical structural member of the long period complicated isolated structure. The corner column has big influence on this isolated structures ' progressive collapse. For the case of removing two vertical structural members,the simplified 3D FE model without slab collapsed progressively,while the refined 3D FE model with slab stay standing. So the simplified 3D FE model without considering the effect of slab may lead to too conservative results. The effect of slab should be considered when studying the structures progressive collapse resistance.