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工程力学  2014 

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

, PP. 142-151

Keywords: 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

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Abstract:

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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