钢-混凝土组合框架结构的连续倒塌分析

Analysis of Progressive Collapse of Steel-Concrete Composite Frame Structure

旨在探讨柱子的位置、结构冗余度多少及不平衡荷载的大小对组合结构抗连续倒塌性能的影响.基于钢管混凝土统一理论,采用拆除构件法,在ANSYS14.0中建立了钢-混凝土组合框架结构的空间有限元模型,运用生死单元技术分别拆除底层特殊部位的一个柱子来模拟结构的连续倒塌,分析了其抗连续倒塌能力.结果表明,组合框架结构的抗连续倒塌能力与柱子所在的位置、结构的冗余度多少及不平衡荷载的大小有关,可以用于结构的抗连续倒塌设计.

The influence of columns＇locations,the structural redundancy and the unbalanced load on performance of progressive collapse of steel-concrete composite frame structure is discussed.Based on unified theory of concrete filled steel tube and using alternate load path method,three-dimensional finite element model of steel-concrete composite frame structure is established in ANSYS14.0.Element birth and death technology is used to remove the columns in the special locations of the first floor.Then the structure＇s progressive collapse is simulated and its resistance to progressive collapse is analyzed.The results show：The ability of the composite frame structure to resist progressive collapse has a close relationship with columns＇locations,the structural redundancy and the unbalanced load,which provides a design reference for the design of resistance to progressive collapse of structure.