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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。
In order to get the failure mechanism and anti-collapse measures of the masonry structure under the action of debris flow, a three-dimensional solid model was established by finite element software LS-DYNA. From the aspects of overall structure deformation, system energy, key point displacement and velocity, Departure, the failure mechanism of masonry structure under debris flow was studied. According to the failure mechanism of masonry structure and combined with the current codes and engineering practices, three measures of preventing collapsing such as increasing the section size of the structural column, reducing the size of the open space and reducing the height of the structural layer are proposed. The numerical results show that reducing the size of the bays and reducing the height of the structure can reduce the plastic deformation of the structural column to a certain extent, but the degree of reduction is not large. The impact resistance of the masonry structure can be effectively increased by increasing the sectional size of the structure ability.