钢管混凝土框架-核心筒混合结构连续倒塌非线性动力分析
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国家自然科学基金项目(51268038);甘肃省科技支撑计划项目(1604FKCA107);甘肃省高等学校科研项目(2018A-079)


Nonlinear Dynamic Analysis of the Progressive Collapse of Concrete-filled Steel Tubular Frame-Core Wall Hybrid Structures
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    摘要:

    为研究钢管混凝土框架-核心筒混合结构在局部构件失效后的连续倒塌机制,基于ABAQUS纤维梁单元和分层壳单元,采用课题组开发的材料本构子程序iFiberLUT,进行了一栋33层钢管混凝土框架-核心筒混合结构在1、17、33层柱和核心筒墙体失效工况下的连续倒塌非线性动力分析,研究了典型柱和剪力墙失效后剩余结构的抗连续倒塌机制。结果表明:33层构件失效时上部节点位移反应最大,17层次之,1层最小,相比核心筒墙体失效,柱失效时上部节点竖向位移更大,震荡更明显;各工况作用对核心筒影响均较小,且核心筒的存在增强了楼板的薄膜效应,提高了结构抗倒塌能力,失效位置距核心筒越近提高越显著;典型构件失效后结构的传力路径遵循"就近原则"向周围构件传递,楼板和核心筒有力的提高了结构的冗余传递路径和整体性。

    Abstract:

    This study aims to understand the progressive collapse mechanism of concrete-filled steel tubular (CFST) frame-core wall hybrid structures when local components are destroyed. Under the failure condition of columns and core walls on the 1st, 17th, and 33rd floors, nonlinear dynamic analysis of a 33-story CFST frame-core wall hybrid structure is carried out based on ABAQUS fiber beam and multi-layer shell elements by using the material constitutive subroutine iFiberLUT. The anti-progressive collapse mechanism of the remaining structure is also studied. When the components are destroyed, the lowest displacement response of the upper node occurs on the 1st floor, a larger displacement response occurs on the 17th floor, and the largest one occurs on the 33rd floor. Compared with that in the failure condition of the shear wall, the vertical displacement of the upper joints is greater and vibrations are more obvious when a column is destroyed. The influence of different working conditions on the core wall is weak, and the core wall enhances the film effect of the floor slab; it also improves the anti-progressive collapse capacity of the structure. Moreover, the path of inertial forces follows the "shortest path principle" when typical components are destroyed. The slab and core wall effectively improve the redundancy load path and integrity of the hybrid structures.

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魏国强,郑龙,王文达,宋子龙.钢管混凝土框架-核心筒混合结构连续倒塌非线性动力分析[J].地震工程学报,2019,41(3):581-587. WEI Guoqiang, ZHENG Long, WANG Wenda, SONG Zilong. Nonlinear Dynamic Analysis of the Progressive Collapse of Concrete-filled Steel Tubular Frame-Core Wall Hybrid Structures[J]. China Earthquake Engineering Journal,2019,41(3):581-587.

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  • 收稿日期:2018-03-31
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  • 在线发布日期: 2019-06-13