Rongguo Zhao, Guangfei Chen, Zaihua Zhang, Wei Luo
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引用次数: 0
摘要
为了估算带装配式桁架梁复合楼板(ATBCF)的多柱框架管式结构的渐进抗倒塌能力,我们采用交替荷载路径(ALP)方法对该结构进行了推倒分析和非线性动力分析。分别研究了边中柱拆除、边中柱拆除和角柱拆除三种不同工况下剩余结构的承载力,并基于内力再分布和第二道防线的破坏模式分析了剩余结构的倒塌机理。同时,讨论了柱破坏时间对剩余结构动态响应和动态放大系数的影响。结果表明,底部角柱拆除后剩余结构的剩余承载力高于侧面或边缘中间柱拆除后的剩余结构,而后者的塑性变形能力更强。采用 ALP 方法进行渐进式坍塌分析时,将柱破坏时间取为剩余结构一阶竖向振型周期的 0.1 倍是合理的,将动态放大系数取为 2.0(即瞬态荷载条件下剩余结构最大动态位移与静态位移之比)也是合适的。
Progressive Collapse Resistance Assessment of a Multi-Column Frame Tube Structure with an Assembled Truss Beam Composite Floor under Different Column Removal Conditions
To estimate the progressive collapse resistance capacity of a multi-column frame tube structure with an assembled truss beam composite floor (ATBCF), pushdown analysis and nonlinear dynamic analysis are conducted for such a structure using the alternate load path (ALP) method. The bearing capacities of the remaining structures under three different work conditions, which are the side middle column removal, the edge middle column removal, and the corner column removal, are individually studied, and the collapse mechanism of the remaining structures is analyzed based on the aspects of the internal force redistribution and the failure mode of the second defense line. Simultaneously, the influence of the column failure time on the dynamic response of the remaining structure and the dynamic amplification coefficient is discussed. The results indicate that the residual bearing capacity of the remaining structure following the bottom corner column removal is higher than that of the one following the side or edge middle column removal, while the latter has a stronger plastic deformation capacity. When the ALP method is adopted to operate the progressive collapse analysis, it is reasonable to take the column failure time as 0.1 times the period of the first-order vertical vibration mode of the remaining structure, and it is suitable to set the dynamic amplification coefficient as 2.0, which is the ratio of the maximum dynamic displacement to the static displacement of the remaining structure under the transient loading condition.
期刊介绍:
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