Elasto-Plastic Seismic Response Anlysis Of Reiniorced Block Masonry Shear Wall

Reinforced concrete masonry shear wall structure is a young structural system in the country,its application and research need to be further developed. The analysis of elasto-plastic seismic response of reinforced masonry shear wall structure has been carried out in this paper, the main work includes the following aspects:(1) A refined hysteretic rule for reinforced concrete masonry shear wall element was summarized in accordance with the result of numerical simulation analysis. For wall pieces with different sections and material strength, the regression equation and the hysteresis rules of feature point parameters were given out, and the refined restoring force model was summed up. The analysis results of Yuan Nan Community and symmetrical structures indicate that the program realize the hysteresis rules of cantilever model and four-link model correctly.(2) Analysis the same structure with MSSP program, refined cantilever model and four-link model, the analysis result of the same wall piece indicate that energy dissipation capacity of MSSP program restoring force model is the best, and the capacity of cantilever model is the worst. But for the ductility of the component, the cantilever model is the best, the MSSP program is the worst, and the four-link model is between them.(3) By elasto-plastic earthquake response analysis of symmetrical structures, the following suggestion about maximum height of reinforced concrete masonry shear wall structure in earthquake zone whose thickness is 190mm was given out: For 7 degree fortification areas, the recommended height limit is 56m. For 8 degree fortification areas, in which the basic design earthquake acceleration is 0.20g, the recommended height limit is 56m, in which the basic design earthquake acceleration is 0.30g, the recommended height limit is 50m. For 9 degree fortification areas, the recommended height limit is 43m.(4) It was recommanded in this paper that for the eccentric structure with 8 layers and above, the bottom three layer can be strengthened in design, for the eccentric structure with less than 8 layers, the bottom two layer can be strengthened.(5) The following suggestion about maximum height of eccentric reinforced concrete masonry shear wall structure in earthquake zone whose thickness is 190mm was given out: For 7 degree fortification areas, in which thebasic design earthquake acceleration is0.10g,the recommended height limit is 56m, in which the basic design earthquake acceleration is0.15g, the recommended height limit is 54m. For 8 degree fortification areas, in which thebasic design earthquake acceleration is 0.20g, the recommended height limit is 51m, in which thebasic design earthquake acceleration is 0.30g, the recommended height limit is 39m. For 9 degree fortification areas, the recommended height limit is 21m.(6) Because of reverse reaction, the edge component is usually a weak component, representing the first damage. Proposed design as needed to strengthen position on the edge of the design. Large cross-section of the edge component, usually were the first destroyed. Therefore recommended that the main pit side of the force components placed in the structure to avoid the edge, and ensure that these components are destroyed later in the other minor components, can greatly enhance the seismic capacity.