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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。
From the perspective of restraint, aiming at the problem of vertically continuous collapse of structures caused by the failure of vertical members, a study was carried out. Based on the theoretical analysis and the physical experiment, the relationships among the cast-in-situ floor slab, the position of the broken column, the surrounding components, the material strength and the component interaction are analyzed in detail from two different angles of force, displacement and energy, And other factors on the impact of the collapse of the column affected by the constraint. The results show that the cast-in-place floor slabs can significantly improve the restraint effect of collapse columns and make the space interaction of components be fully exerted; the most easily damaged corner columns have the least restraint effect and should be strengthened during design; The high-strength concrete can significantly increase the restraint effect of collapse columns due to the collapse of the collapsed column in the early stages of collapse. Based on the constraint analysis method of slump energy, it is helpful to understand the vertical continuous collapse and catastrophe process from the energy point of view, This makes it possible to quantitatively evaluate the slump resistance of damaged columns.