The Nonlinear Performance Simulation And Study On Failure Mode Of Rural Masonry Structure Under Earthquake

Masonry structure in the rural areas of China is widespread, and the seismic performance is poor due to the special nature of the material and structure of masonry structures. In the previous damage, destruction of masonry structure is more serious than others. Because earthquake-proof facilities in rural areas and security concepts are relatively backward, property damage and casualties caused by the earthquake are more serious than urban residents. Therefore, seismic research based on rural residential masonry structure has important practical significance.In this paper, the masonry structure seismic performance is analysed by using the finite element software. The main work in the following areas is done:By comparing masonry walls cyclic loading tests, the correctness of the numerical analysis model to determine a reasonable constitutive relations and parameter settings is reliable; By comparing masonry structure shaking table test,the seismic perfomance effects of different mortar strength, with or without structural columns, with or without ring beam, vertical and horizontal wall opening parameters is analysed on the basis of the reliability of the simulation.The process of collapse of masonry structures is simulated.By the research of the numerical model analysis, the following conclusions are drawed:The analytical model and related parameter settings is determined and the applicable constitutive relations for autoclaved fly ash brick masonry is chosen; Through the monolithic wall parameter analysis, it is found that the parameters of vertical stress, mortar strength and structural columns significantly affected the mechanical properties of the monolithic wall, mainly in two aspects of strength and ductility coefficient; Through the verification and parameters masonry structure analysis, the impact of parameters of mortar strength, structural columns, ring beams, vertical and horizontal wall opening of the structure of the overall performance is found. Taking into account the combined effects of different parameters, the concept of integrity factor is used to evaluate the seismic performance of the structure.