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中文摘要：
为了得到泥石流作用下砌体结构的破坏机理和防倒塌措施,该文利用有限元软件LS-DYNA建立了三维实体模型,分别从结构的整体变形、系统能量、关键点位移和速度等4个方面出发,对泥石流作用下砌体结构的破坏机理进行了研究。根据砌体结构的破坏机理,结合现行规范和工程实践,提出了增大构造柱截面尺寸、减少房屋开间尺寸和降低结构层高等三种防倒塌措施。数值计算结果表明,减少房屋开间尺寸和降低结构层高在一定程度上能够减小构造柱的塑性变形,但是减少程度不大;通过增加构造柱的截面尺寸能够有效地增加砌体结构的抗冲击能力。
英文摘要：
In order to acquire the failure mechanism and anti-collapse measures of masonry structures under debris flow, this paper established a three-dimension fluid-solid coupling finite element analysis model by means of the finite element software LS-DYNA. The failure mechanism of masonry structures under debris flow were investigated by observing the deformation of structure, the energy of system and the displacement and velocity of key points. According to the failure mechanism of masonry structure and referring to the current codes and engineering practice, three anti-collapse measures were proposed, including increasing constructional column section size, reducing housing width size and lowering the structure height. The numerical results show that the plastic deformation of constructional columns can be reduced insignificantly by reducing housing width size and/or lowering the structure height; the impact resistance of masonry structure can be effectively increased by increasing the section size of constructional columns.
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