高文乐,王燕萍,李琛豪,张建伟,李赛江

• 1:山东科技大学土木工程与建筑学院
• 2:中建八局第二建设有限公司

摘要(Abstract)：

为研究小高宽比框架结构爆破拆除的倒塌过程，利用ANSYS/LS-DYNA有限元软件建立分离式共节点模型，对其倒塌过程进行数值模拟研究，分析该结构钢筋混凝土柱的受力特点。通过对比实际工程与模拟结果，发现两者在倒塌时间、倒塌历程、爆堆范围等方面高度一致，由此可见数值模拟是可靠的。研究发现：在倒塌过程中，各排立柱达到截面抵抗弯矩后会在梁柱节点处产生塑性铰，上部结构以塑性铰作定轴转动，前倾过程中对后排立柱产生向后的反力，以致产生明显的后坐。倒塌前期钢筋与混凝土单元共同受力，混凝土单元失效后，与其共节点的钢筋单元应力发生突变，随后在拉压状态下不断变换，直至倒塌结束，爆破切口处的钢筋对上部结构的自由落体有一定的阻碍作用。

关键词(KeyWords)： 楼房爆破拆除;小高宽比;分离式共节点;数值模拟

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51874189)~~

作者(Author): 高文乐,王燕萍,李琛豪,张建伟,李赛江

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