【摘要】 从约束作用角度,针对竖向受力构件失效导致的结构竖向连续倒塌热点问题开展研究。以理论分析、物理试验为基础,依靠修正、确认的数值模型,从力和位移、能量两个不同的角度,详细分析了现浇楼板、断柱位置、周边构件、材料强度和构件间相互作用等因素对因灾塌落柱所受约束作用的影响。结果表明:现浇楼板能够显著提高因灾塌落柱所受的约束作用,可使构件间空间相互作用得到充分发挥;最易损毁的角柱所受的约束作用最小,在设计时应予以加强;因灾塌落柱塌落的早期阶段,高强混凝土能够显著提高塌落柱所受的约束作用;基于抗塌落能的约束作用分析方法,有助于从能量角度认识竖向连续倒塌灾变过程,使定量评价损毁柱的抗塌落能力成为现实。更多还原

【Abstract】 From the perspective of the constraint effect,the research on the vertical progressive collapse initiated from the failure of vertical force components was carried out.The analysis for the effects of cast-in-situ slab,the locations of the broken columns,the surrounding structures,the strengths of materials and the interaction between components on the collapsing column caused by the plagues was presented in detail by amending and confirming the numerical models based on theoretical analysis and the experiments.The results show as follows.The cast-in-situ RC slabs can significantly magnify the constraint effect on the collapsing column caused by the plagues.The corner columns most vulnerable to damage are under least restraint effect,therefore some reinforcement should be put on it.In the early stage of the collapse of the column,high strength concrete can significantly improve the constraint effects.The analytical method for the constraint effect based on the collapse resistance energy helps understanding of vertical progressive collapse from the viewpoint of energy,and quantitatively evaluates the ability of anti-collapse.更多还原