Experimental Study On Seismic Behavior Of Precast Reinforced Concrete Shear Wall With Different Vertical Steel Connection

Housing industrialization is the development direction of the residential building construction in our country, because cast-in-situ structure will not only cause the waste of resources and environmental pollution, but also cause the uneven quality of construction for the reason of relying on workers too much. The assembly structure can let the component produced in the factory in advance and assembled in the construction site, which can get the convenience from industrialization and guarantee the quality of construction. However, our country starts late to study on precast shear wall joints, the relevant technology is mainly imported from abroad then we do some confirmatory tests; On the other hand, effective measures to simplify the construction process and also meet the seismic demand for low seismic region like Chongqing have rarely been studied. So in order to make the application of related technology in Chongqing is based on data, in order to verify the rationality of precast shear wall joint’s innovative ways of construction, it is very necessary for an experimental study on seismic behavior of precast shear wall with different vertical steel connection.The performance of precast reinforced concrete shear wall with different vertical steel connection was studied in this thesis through the seismic test of five pieces of full scale shear wall, including one cast-in-situ shear wall, one precast shear wall connected by indirectly lap in grouted hole, one precast shear wall connected by grout sleeve and two multiple-connection shear wall for improving the construction process, they were subjected to reversed cyclic combined flexure and shear in addition to constant axial stresses normal to the connection to evaluate the ductility, energy dissipation and stiffness degradation. Followed finite element analysis was used to find the different stress distribution between cast-in-situ wall and indirectly lap in grouted hole wall. At last, the advantages and disadvantages summary for grout sleeve connection and indirectly lap in grouted hole connection were presented, the influence to each part of this connection by changing grouting material elastic modulus was also presented in this thesis and an improving method was proposed.Through the quasi-static test results we can get the conclusions that indirectly lap in grouted hole can transfer stress effectively and make the specimen show a better performance in energy dissipation than cast-in-situ specimen; The middle steels in precast shear wall are connected by one row connection or partly connected connection can simplify the construction process and more effectively reflect the characteristics of housing industrialization, they can also provide latter continue bearing capacity while both end sleeve connection lose efficacy, so they are worth doing more research to promote in housing industrialization construction.Through the finite element analysis we can get the conclusions that the specimen with the connection of indirectly lap in grouted hole put up a great difference in stress distribution from cast-in-situ specimen when subjected to axial pressure and bending shear stress, so we should take structural measures to reduce this difference, or else we should limit this connection applied in high axial pressure situation and highly seismic region; Spiral stirrups as one part of indirectly lap in grouted hole can effectively prevent the splitting failure and strengthen the wall foot concrete, they play a bigger role at the both end than in the middle.Through the analysis on the performance of grout sleeve connection and indirectly lap in grouted hole connection we get the conclusions that grout sleeve connection makes force transmission more direct and construction more convenient while high technological requirements are also needed for such connection, and thread quality and compactness of grouting effect seriously to such connection; Indirectly lap in grouted hole connection can effectively transfer force, and the specimen with such connection can performance as well as cast-in-situ specimen in flexural behavior under low axial compression ratio, however, the force transfer mechanism is more complex, which means it needs further research; The stress distribution of specimen with the connection of indirectly lap in grouted hole has a direct relationship with the elastic modulus of grouting material, the stress gets smaller when the elastic modulus of grouting material gets close to concrete, so in addition to other mechanical properties should meet the requirements, the parameter of the elastic modulus is also need to be strictly controlled.