A Masonry Structure Cause Analysis

Wall cracking and building slope are the most common diseases during the service life of masonry structures, and the reasons are very complex, such as the differential settlement of the foundation, temperature change, wall shrinkage and load change. In recent years, wall crackings are found more often, though there have been some measures for them. But the cracks come up again shortly after the repairing, and the primary causes leading to cracks have not been found. Therefore, it is necessary to study the reasons for the wall cracking.Taking the building in Xiangyin of Hunan province as the research object, a three-demensional finite model is built with the finite element analysis software ANSYS. It is based on the results of simmulational analysis of the masonry building composed of upper structure, foundation and ground,. Then it analyzes the stress conditions of the house, discovers the rules of differential settlement and oblique of the building and explains the reason for the cracking walls according to the simmulational analysis of the geological conditions,outside environment, loading conditions of the masonry building.G21 is established on the numrical analysis of the soil foundation settlements with the different soil papameters and the comparative analysis of wall damage, tilting and settlemt. Then with the comparative analysis of the two patterns of elastic analysis anf elasto-plastic analysis of the whole building, the reasons for the damaged building are the differences of the soil conditions and the non-uniformity settlement of ground foundation. And the simmulational results of the latter can reflect the reality better.The dangerous parts and injured condition of building can be fixed by using finite element numerical simulation analysis to grasp the load condition of the building, which is helpful for structure reinforcement and rectifying control.