ABSTRACT
Taking the rural buildings in Anhui section of Tan Lu fault zone as the research object, based on the field investigation and detection of seismic performance, the typical masonry structure scheme of rural buildings is designed. The numerical model of the basic structure and the variable parameter comparative analysis model considering structural layout, material strength and numerical model grid control are established by using the finite element software ABAQUS. The modal analysis of each model is carried out, and the vibration shape, vibration mode component and vibration mode period are selected as the comparative analysis indexes. The analysis shows that the vibration characteristics of masonry structures arranged according to the conventional layout in village and town buildings are not conducive to structural earthquake resistance. The performance degradation of masonry materials not only reduces the bearing capacity of the structure, but also amplifies the seismic action of high-order out of plane vibration components, which intensifies the probability of external flash collapse of the bearing wall in the earthquake. If measures are taken to realize that the basic vibration mode of the structure is translational along the transverse direction, the vibration characteristics show that the load-bearing and lateral resistance of the transverse wall can be effectively brought into play, and the high-order vibration mode of out of plane vibration is suppressed, which improves the seismic capacity of the structure. In addition, the grid control requirements of ABAQUS for shell elements along the thickness direction are also proposed in this paper.
