小高宽比框架结构爆破拆除数值模拟研究  

Study on Blasting Demolition of Frame Structure with Small Height-width Ratio by Numerical Simulation

作　　者：高文乐 王燕萍 李琛豪 张建伟 李赛江 GAO Wen-le;WANG Yan-ping;LI Chen-hao;ZHANG Jian-wei;LI Sai-jiang(College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China;The Second Construction Limited Company of China Construction Eighth Engineering Division,Jinan 250014,China)

机构地区：[1]山东科技大学土木工程与建筑学院,青岛266590 [2]中建八局第二建设有限公司,济南250014

出　　处：《爆破》2024年第1期112-119,共8页Blasting

基　　金：国家自然科学基金项目(51874189)。

摘　　要：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。An equal proportion separated common node model was established by ANSYS/LS-DYNA finite ele-ment software to simulate the collapse process of a frame structure with a small height-width ratio demolished by blas-ting,and the stress characteristics of reinforced concrete columns of the structure were analyzed.It is found that the actual engineering and simulation results are highly consistent in terms of collapse time,collapse process and blast muck pile range,which shows that the numerical simulation is reliable.Additionally,during the collapse process,the plastic hinge was generated at the beam-column joints after each row of columns reached the section resistance mo-ment,and the upper structure rotated with the plastic hinge as the fixed axis.There was a backward reaction force on the rear column,which resulted in an obvious recoiling in the forward leaning process.In the early stage of collapse,the stress of the reinforcing bar and the concrete element is stressed together.The stress of the reinforcing bar ele-ment with its co-node suddenly changed after the failure of the concrete element,and then it continuously changed in the state of tension and compression until the collapse ended.The reinforced bar at the blasting cut has certain hin-drances to the free fall of the upper structure.

关 键 词：楼房爆破拆除 小高宽比 分离式共节点 数值模拟 

分 类 号：TD235.3[矿业工程—矿井建设]