The Seismic Performance Of Precast Concrete Shear Wall With Four Type Connections

Precast concrete structures(PCS)receive wide attention and political support due to their high industrialization,fast construction,good quality and environment protection.The joint connection is the key to the precast concrete structures.The wet joint and dry joint are proposed for improving the old joint connections of the PCS.Two wet joints are analyzed and two dry joints are proposed.In this paper,the precast concrete shear walls were tested.The main works are as follows:· Development of A Miniature Grout Sleeve Joint1.Mechanical performance tests of twenty-six common used steel and iron grout sleeve joints were completed,a calculation model of cylinder wall was established,the accuracy of the calculation model was verified by the test data,a theoretical basis for the design of miniature grout sleeve joint was provided.2.Fifty-nine specimens of the miniature grout sleeve joint were designed and tested,the bond slip relationship was established,the reliability analysis of the miniature grout sleeve joints was carried out based on JC method,and the proposed anchorage length was given of the miniature grout sleeve joint.· Development of A Grout-Filled Lap Splice Joint1.A new type of grout-filled lap splice joint was also adopted,the mechanical performance tests of thirty-six specimens were completed,a theoretical model was established to obtain the ultimate lap splice length,and the calculation results were verified by the test results of the specimens.2.The failure mode and ultimate anchorage length of the grout-filled lap splice were analyzed through the anchorage performance tests of thirty specimens.The reliability analysis of the grout-filled lap splice joint was carried out based on JC method,and the proposed lap splice anchorage length was given.The effectiveness was verified by comparing with the theoretical results by code· Development of Dry Joint and Experiment of Precast Concrete Shear WallBox-shaped steel and H-shaped steel beam joints were developed for the removable concept of the PCS,four PCSW tests were completed with different joints.The failure mechanism and stiffness degradation were analyzed.The flexure ratio,shear ratio and slip ratio of the PCSW were calculated based on the failure process,load-displacement curves and energy dissipation.· Finite Element Simulation with Coupled Multiunit ModelBased on the shear flexure interaction multiple vertical line element models(SFI-MVLEM),nonlinear beam column model and zerolength element model were coupled to simulate the base rotation and slide of the PCSWl.The finite element modeling and numerical analysis of the specimens were done using OpenSEES software.From the results it can be noted that the coupled models can simulate the deformation rantio and mechanical properties of the PCSW effectively.· Displacement Based Performance Design Method of Precast Concrete Shear WallThe performance level of the wet and dry joints of the PCSW structure was divided and quantizationed according to the test results,and the effective bending stiffness was analyzed.The seismic design was carried out based on displacement based performance design method and effective bending stiffness reduction coefficient.The removable design,the definite range of building height and reinforcement design were proposed.Finally,from the study it can be found that,the experimental and analytical results provide basis for the application and dissemination of precast concrete structure,which have important practical significance for promoting the construction industrialization in China.