Abstract
In mountainous areas, geological disasters carrying large boulders can cause severe damage to the widely used masonry buildings due to the high impact forces. To better understand the damage of brick masonry buildings under the impact of boulders, a “block-joint” model is developed using threedimensional discontinuous deformation analysis (3-D DDA) to simulate the behaviour of the “brick-mortar” structure. The “block-joint” model is used to capture not only the large displacement and deformation of individual bricks but also the large-scale sliding and opening along the mortar between the bricks. The linear elastic constitutive model is applied to account for the non-plastic deformation behaviour of brick materials. Furthermore, the mechanical characteristics of the mortar are represented using the Mohr-Coulomb and Drucker-Prager criteria. To propose safe structural design schemes and effective reinforcement for brick masonry buildings, seven construction techniques are considered, including different grades of brick and mortar, effective shear areas and reinforced members. The proposed 3-D DDA model is used to analyse the velocity distribution and the key point displacements of the brick masonry building under the impact of boulders. The results show that upgrading the brick and mortar, increasing the wall thickness, making full use of the wall thickness, and adding a circular beam and structural column are very effective approaches for improving the impact resistance of brick masonry buildings.
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Liu, Sg., Li, Zj., Zhang, H. et al. A 3-D DDA damage analysis of brick masonry buildings under the impact of boulders in mountainous areas. J. Mt. Sci. 15, 657–671 (2018). https://doi.org/10.1007/s11629-017-4453-5
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DOI: https://doi.org/10.1007/s11629-017-4453-5