梁板子结构的防倒塌机理研究

在模型验证的基础上,基于有限元软件对无板框架、无约束梁板子结构和有约束梁板子结构的抗连续倒塌能力进行对比,来研究边中柱移除工况下梁板子结构的抗倒塌机理。研究结果表明:连续倒塌发生时,梁板子结构中梁的悬链作用和板的薄膜效应可以提高结构的抗力,增加结构的变形能力;邻近楼板对梁板子结构的板边约束能大大增强结构的抗倒塌能力,但横向梁可能先于双跨梁发生破坏,因此在结构的抗倒塌设计中还应对横向梁的抗倒塌能力予以重视。

Research on collapse resistant mechanism of beam-slab substructures

In this paper, on the basis of verifying the validity of the model, the abilities of collapse resistant, which are beam-column frame, beam-slab substructures without constraint, beam-slab substructures with three sides restrained, were compared through the finite element software to study collapse resistant mechanism of beam-slab substructures under penultimate-external column removal scenario. The research results indicate that when the progressive collapse occurs, catenary and membrane effect of rebar in slab can resist structure deformation, and improve the structure resistance force. Constrain of slab edge can greatly enhance the ability of collapse resistant, but the transverse beams may damage before the double-span beam. Therefore the ability of collapse resistant of transverse beams should be valued in collapse resistant design.