Experimental Study And Finite Element Analysis Of Fabricated UHPC Composite Shear Wall

Considering the actual production,transportation and hoisting,the composite shear wall generally has the problems of large thickness of internal and external prefabricated plate,small block size and more splicing joints,which greatly limit the promotion and use of the prefabricated wall.In order to solve the above problems,a new precast slab of composite shear wall is proposed.The wall slab is Inade of iltra high performance concrete(UHPC)with higher compressive,tensile,crack resistance and durability,which can greatly reduce the thickness of precast slab and increase its block size.Then,a new type of prefabricated UHPC composite shear wall is proposed,and its quasi-static test and finite element analysis are carried out.The research can provide certain reference value for the promotion and industrialization of the fabricated UHPC composite shear wall.The main research contents and conclusions of this paper are as follows:1.Four assembled UHPC composite shear walls and one cast-in-situ concrete shear wall are designed and manufactured,and then the low cycle horizontal reciprocating loading test is carried out to explore the ductility,bearing capacity,energy dissipation capacity and elastic deformation resistance of the new assembled UHPC composite shear wall.The effects of height width ratio,EPS core replacement and vertical reinforcement anchorage on the seismic performance of the UHPC composite shear wall are analyzed.The research shows that the fabricated UHPC composite shear wall has the same excellent seismic performance and energy dissipation capacity as the cast-in-situ shear wall,and its horizontal bearing capacity is higher and its stiffness is greater.Although the ductility is slightly reduced,it still meets the requirements of the code.The smaller the aspect ratio,the higher the bearing capacity,the greater the stiffness and the worse the energy consumption of the fabricated UHPC laminated shear wall,but the aspect ratio has little effect on its ductility.EPS core replacement has little effect on the bearing capacity of the fabricated UHPC composite shear wall,but it will weaken its later stiffness and ductility.The connection between the concealed column vertical reinforcement and the base has little effect on the bearing capacity,energy consumption and stiffness of the UHPC composite shear wall,but will have a negative impact on its ductility.2.The finite element analysis software ABAQUS is used to establish the initial model of five specimens,and further analyze the influence of variable parameters such as different prefabricated plate thickness,different EPS core module replacement rate,different axial compression ratio and different diameter of concealed column reinforcement on the seismic performance of the new shear wall.The results show that this model can not only show the failure process and failure state of the fabricated UHPC composite shear wall,but also simulate the hysteresis curve and skeleton curve of the shear wall.Different prefabricated plate thicknesses and different EPS core-mold replacement ratios have little effect on the maximum horizontal bearing capacity and stiffness of the assembled UHPC composite shear wall,but they can greatly reduce the use of concrete,reduce self-weight,and facilitate production and construction.The maximum horizontal bearing capacity and stiffness of the fabricated UHPC composite shear wall can be significantly improved by increasing the axial compression ratio and the diameter of concealed column reinforcement,but it will have a certain negative impact on the ductility of the specimen.Therefore,the appropriate axial compression ratio and the diameter of reinforcement should be selected according to the actual demand,and the bearing capacity and ductility should be taken into account.