Simulating the damage extent of unreinforced brick masonry buildings under boulder impact using three-dimensional discontinuous deformation analysis (3-D DDA)
Simulating the damage extent of unreinforced brick masonry buildings under boulder impact using three-dimensional discontinuous deformation analysis (3-D DDA)
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DOI：
10.1016/j.engfailanal.2018.07.013
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发表时间：
2018-11-01
影响因子：
4
通讯作者：
Wang, Wei
中科院分区：
文献类型：
--
作者：
Li, Zhujun;Liu, Shuguang;Wang, Wei
砖砌体房屋的主要材料是不连续的砌体材料。本文对砌体结构的损伤特性和砌体结构性能的研究方法进行了综述。采用三维非连续变形分析（3-DDDA）方法，对砖砌体房屋在巨石撞击下的破坏程度进行了分析。根据砌体材料的非连续性特点，建立了一个“块-缝”模型来表示建筑物的砖和砂浆。在此基础上，利用基准模型对三维DDA进行了验证。利用该方法，得到了建筑物块体关键点的速度分布和位移，比较了建筑物在不同高度、面内和面外6种不同情况下的损伤程度。建筑物模型的尺寸和材料参数是基于调查领域中最常见的建筑物。这些结果可用于连续地显示建筑物的破坏过程或定量地比较不同类型建筑物的破坏程度。通过分析基本单元块体的受力情况，结果表明建筑物的破坏程度与撞击方向、撞击高度、受损部位与撞击位置的位置关系以及约束条件有关。
The main material of brick masonry buildings is discontinuous masonry material. This study presents a critical review of the damage characteristics of masonry and the methods for studying the behavior of masonry. The damage extent of brick masonry buildings under boulder impact is analyzed using an approach based on three-dimensional discontinuous deformation analysis (3-D DDA). A "block-joint" model is established to represent the brick and mortar of the building, which is based on the discontinuous characteristics of the masonry material. On this basis, a benchmark model is used to validate the 3-D DDA. Using this approach, the velocity distribution and several displacements of key points of the building blocks are obtained to compare the damage extent of the building under six different cases that consider in-plane or out-of-plane boulder impacts to the building at different heights. The size and material parameters of the building model are based on the most common buildings in the field of investigation. These results can be used to show the failure process of buildings on a continuous basis or to quantitatively compare the damage extent of different types of buildings. By analyzing the force condition of the basic element blocks, the results demonstrate that the damage extent of the building is related to the impact direction, impact height, location relationship between the damaged part and the impact position, and constraint condition.