Experimental Study On Seismic Performance Of Precast AssembledShear Wall At The Bottom Of Cast-in-place

Housing industrialization is the development direction of China’s housing construction,prefabricated shear wall structure is suitable for a structural system of housing industrialization in our country.For precast concrete shear wall structure,reliable connection between the precast wall, is the key to ensure the integrity and seismic performance. Connection structure of precast concrete shear wall edge members should ensure that the vertical reinforcement stress continuity, in order to ensure the strength of rebar into full play and reinforced edge of concrete members, improve the ability of deformation of the concrete, so as to improve the ductility and seismic behavior of the shear wall, the performance and the performance of shear wall is similar assembly the cast structure is basically the same.On the basis of reading a lot of literature, to further simplify the level splicing method of prefabricated shear wall, improve efficiency and reduce costs, this paper improved the existing linear shear wall "through" type seam connection mode, put forward a style,that is after pouring region around the bottom of shear wall on both sides with the reserved high 600mm, width of 500mm,the other part is prefabricated, then the assembly to the distribution area, precast concrete as a temporary support, through embedded long pouring hole pouring to in column region concrete and vibrating compaction, the formation of a "concave" shape seam connection method, main research works and conclusion are as follows:(1)The design and fabrication of the precast concrete shear wall components of a font, through the horizontal cyclic loading test of components to record and analysisthe data.(2)The linear shear wall are used the low cyclic reversed loading tests of under the condition of 0.1 and 0.2axial compression, test results show that the ductility of member decreasewith the increasing of axial compression ratio, but the components of yield load, ultimate bearing capacity increase with the increase of axial compression ratio.(3)Do experimental research of seismic performance of these two different axial compression edgestructural optimization methods, and compared with the cast-in-place test specimen. Carrying out a comprehensive evaluation of these specimens’ seismic performance under low cyclic reversed loading through observe the cracks development, failure process and failure modes of the specimen, as well as the hysteretic curves, skeleton curves, stiffness, bearing capacity, ductility and energy dissipation capacity. The test results show that, compared with the cast-in-place specimen, prefabricated hysteretic curves showed "S" type full, ductility coefficient reached the design requirements, with good ability of the seismic energy dissipation.(4) Simulation analysis of incremental loading on the horizontal force at different axial compression ratio under the condition of the cast-in-place specimen, the bottom of cast-in-place prefabricated shear wall subjected to monotonic by ABAQUS, by considering the concrete damage during loading process, reproduction of development directly reinforced concrete plastic hinge in the process of test, the stress-strain relationship and load displacement, and made a comparative analysis with the test, the results show that the finite element analysis results and experimental results show close.Through the above work,it can be seen that the strength of edge prefabricated shear wall structure directly affect the seismic performance of shear wall structure,so adopt reasonable and effectiveedge shear wall structure is of great significance.