Seismic Behavior Test And Theo- Retical Study Of Double-Wall Precast Concrete Shear Walls

With the accelerated urbanization process in China, building industrialization and housing industrialization have been generally promoted in China nowadays. The precast concrete structure is one suitable structure form and it's worth doing in-depth research on. The shear wall structure is commonly used in housing building in China. The precast concrete shear wall structure in China has obtained the considerable development in recent years.Supported by National Key Technology R&D Program ?No.2011BAJ10B03?, Produc-tion and Research Prospective Joint Research Project of Jiangsu Province ?No.BY2014127-5?, the Colleges and Universities in Jiangsu Province Plans to Graduate Research and Innovation ?No.CXLX13₁05?, and the Fundamental Research Funds for the Central Universities, this paper synthetically studied seismic behavior of DWPC shear wall by experiments and theoretical analysis.Experimental engineering application of DWPC shear wall structures in Suqian, a highly seismic region ?0.3g?, was discussed. Also has conducted the research and the discussion with respect to the new building industrialization.DWPC shear wall structure improvement measures are proposed in this paper, it has been verified by experiment and finite element numerical simulation analysis, shows that its bearing capacity is improved, the overall performance and seismic performance, the structure improvement of DWPC shear wall can be applied to most of the seismic fortification of an-ti-seismic construction in our country. Paper of restoring force model is established and the parameterized numerical simulation analysis result, available for DWPC shear wall of dy-namic analysis and structure design to provide the reference.The main work and achievements are as follows:1. The literature and technology related to precast concrete shear wall structure were concluded and analyzed. That provided the thinking of analysis and basis of research to dou-ble-wall precast concrete shear wall.2. To study the seismic behaviors of DWPC shear walls, three kinds of full scale speci-mens with different shear span ratios and vertical reinforcing bar ratios of boundary elements, including six DWPC shear walls, two unbonded post-tensioned hybrid DWPC shear walls, and three normal cast-in-situ shear walls, are tested under low-cyclic reversed loading when the axial compression ratio is 0.1. By observing their experimental phenomena and failure modes, contrasting their displacement ductility coefficients, hysteretic curves, skeleton curves and energy dissipation capacity, the seismic behavior were synthetically evaluated on aspects of strength, stiffness, ductility and energy dissipation.The test results show that the DWPC shear walls can work together well. Installation of continuous compound spiral stirrups in the boundary element can improve the bearing capacity, stiffness, seismic energy dissipation be-havior of the DWPC shear walls and weaken the stiffness degradation. With the increase of the vertical reinforcing bar ratio of the boundary element, both the bearing capacity and the stiffness increase. The improved DWPC shear walls have satisfactory elastic-plastic defor- mation capacity and energy dissipation capacity. The equivalent viscous damping coefficients of DWPC specimens are almost the same as those of cast-in-situ specimens within the elastic range and lower beyond the elastic range. Moreover, the seismic energy dissipation capacities of the DWPC specimens become closer to those of cast-in-situ specimens with the increase of the shear span ratio.3. Combined with the above mentioned experimental analysis results, based on the analysis of hysteretic curves and skeleton curves, a four-line restoring force model of the DWPC short-leg shear wall and a three-line restoring force model of the DWPC shear wall were established. Comparisons between test results and calculation results were made show-ing that it agree well, which could be used as a basis for simulation of DWPC shear wall.4. Based on the theory of concrete damage plasticity model, the parameters for numeri-cal simulation analysis of the DWPC shear wall specimens had determined. By comparing the numerical simulation results and test results, verify the feasibility of numerical simulation of finite element model is established in this paper. Finite element analysis by changing main parameters was also carried out to research their influence on the performance of the DWPC shear wall. The parameters inculde the axial compression ratio, level connection bar diameter, edge member vertical bar diameter, spiral hoop of edge member and the tension of hybrid DWPC shear wall, etc.5. Several typical new construction technology of precast concrete structure in house building was presented and the respective characteristics were discussed. Based on the DWPC shear wall pilot project in Suqian, seismic design, node connection, construction technology and component design were introduced detailedly. And the improvement of the DWPC shear wall was introduced.The experimental studies and theoretical analysis, provides the foundation and basis for the DWPC shear wall structure and the follow-up research and engineering application, and has important practical significance to promote the new building industrialization in china.