| 基于纤维模型的钢管混凝土组合框架连续倒塌非线性动力分析 |
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| 引用本文： | 王文达, 王景玄, 周小燕. 基于纤维模型的钢管混凝土组合框架连续倒塌非线性动力分析[J]. 工程力学, 2014, 31(9): 142-151. DOI: 10.6052/j.issn.1000-4750.2013.04.0282 |
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| 作者姓名： | 王文达 王景玄 周小燕 |
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| 作者单位： | 1.兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃,兰州 730050;;2.甘肃省建筑设计研究院,甘肃,兰州 730030 |
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| 基金项目： | 国家自然科学基金项目(51268038) |
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| 摘 要： | 基于非线性纤维梁-柱单元理论建立了钢管混凝土空间框架有限元模型,分析其在非正常荷载作用下(火灾、爆炸、撞击等)的抗连续性倒塌性能。以ABAQUS软件为求解平台进行了钢材和混凝土材料模型的二次开发,并采用已有研究者的试验结果进行了模型验证,在此基础上采用抽柱法进行了一典型的12层钢管混凝土空间框架体系在不同初始损伤模型下的连续性倒塌非线性动力分析。分析结果表明,不同抽柱工况下,框架梁柱内力由于失效柱破坏将发生内力重分布,相邻构件弯矩和轴力变化较大,其卸载后传力路径遵循就近原则;底层中柱失效后,其上部节点竖向位移最大,底层角柱失效后,上部节点竖向位移最小。总体上钢管混凝土空间框架在竖向荷载作用下具有较好的抗连续倒塌性能。
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| 关 键 词： | 结构工程 钢管混凝土 组合框架 非线性动力分析 连续倒塌 纤维模型 |
| 收稿时间： | 2013-04-07 |
NONLINEAR DYNAMIC PROGRESSIVE COLLAPSE ANALYSIS OF COMPOSITE FRAMES WITH CONCRETE-FILLED STEEL TUBULAR COLUMNS BASED ON FIBER MODEL |
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| WANG Wen-da, WANG Jing-xuan, ZHOU Xiao-yan. NONLINEAR DYNAMIC PROGRESSIVE COLLAPSE ANALYSIS OF COMPOSITE FRAMES WITH CONCRETE-FILLED STEEL TUBULAR COLUMNS BASED ON FIBER MODEL[J]. Engineering Mechanics, 2014, 31(9): 142-151. DOI: 10.6052/j.issn.1000-4750.2013.04.0282 |
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| Authors: | WANG Wen-da WANG Jing-xuan ZHOU Xiao-yan |
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| Affiliation: | 1.Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, Gansu 730050, China;;2.Gansu Insititute of Architectural Design and Research, Lanzhou, Gansu 730030, China |
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| Abstract: | This paper established a finite element (FE) model of spatial composite frame with concrete-filled steel tubular (CFST) columns based on nonlinear fiber beam-column element theory, and then investigated its anti-progressive collapse behavior subjected to abnormal loadings such as fire, blast or shock. The user-defined material models of concrete and steel were incorporated in subprogram UMAT provided by ABAQUS software. The user-defined material models were verified by reported experimental results. Nonlinear dynamic progressive collapse analysis of a typical 12-story spatial composite frame was performed under different initial failure modes. The results show that the internal forces of columns and beams are redistributed due to the failure of column, and the bending moments and axial forces of adjacent components change significantly. The redistribution of internal forces during unloading follows the “shortest path principle” in general. The maximum vertical displacements of upper level joints are associated with the damage of middle columns at the bottom, while the minimum vertical displacements of upper level joints are associated with the damage of corner columns at the bottom. The spatial composite frame with CFST columns has good anti-progressive collapse behavior. |
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| Keywords: | structural engineering concrete filled steel tube (CFST) composite frame nonlinear dynamic analysis progressive collapse fiber model |
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