Study On Shaking Table Test Of Precast Concrete Wall-panel Structure With Keyway And Grouted Sleeve Connection

In view of the existing prefabricated buildings are mostly’equivalent cast-in-place ’ connection,it is difficult to give full play to the advantages of intelligent industrial production and rapid assembly.Therefore,the research group proposed a new type of prefabricated wallpanel structure system: keyway and sleeve connection prefabricated concrete wall-panel residential structure system.In order to further understand the overall seismic performance of the new structural system,based on the similarity ratio relationship,this paper carried out the shaking table test of a single-span three-story 1/2 scale prefabricated wall-panel substructure,obtained and analyzed the failure characteristics,basic dynamic characteristics and dynamic response of the substructure.Based on the test results,the finite element model is established and verified,and the time-history analysis of the eight-story prototype prefabricated wallpanel residential structure model is carried out.The main research contents and conclusions are as follows :(1)The prototype structure model of an eight-story student apartment was constructed.The elastic time history analysis of the prototype structure model was carried out,and the most unfavorable substructure test unit was determined and selected.A 1/2 scale keyway and sleeve connection wall plate structure test model was designed and manufactured;The production process and assembly process of assembled wall-panel structural components connected by keyway and sleeve are summarized and given.(2)The shaking table test of 1/2 scale keyway and sleeve connection wall-panel substructure was carried out.The dynamic characteristics of the structure,such as natural frequency,damping and vibration mode,as well as the dynamic response indexes,such as acceleration and interlayer displacement,were analyzed.The seismic performance of the substructure was evaluated based on the interlayer displacement angle and the stress state of the connecting steel bar.It was found that the model structure could still maintain the elastic working state under low seismic intensity,and there was no collapse under high seismic intensity,indicating that the model structure had reliable overall performance and good seismic performance.(3)Based on the shaking table test results of the substructure,the overall stress behavior and deformation of the wall-panel structure connected by the keyway and sleeve are discussed,and the damage and failure characteristics of the structure are revealed.It is found that they are concentrated in the horizontal joints at the bottom,indicating that the horizontal joints are the weak links of the whole structure.In addition,the distribution of the maximum displacement of the structure with the storey height shows the characteristics of bending-shear deformation,while the cast-in-situ shear wall structure is generally bending deformation,indicating that the lateral stiffness of the wall-panel structure connected by the keyway and sleeve is weaker than that of the cast-in-situ shear wall structure.(4)The 1/2 scale substructure model of the keyway and sleeve connection was established by SAP2000 general software,which was compared with the experimental results and verified.On this basis,the finite element calculation model of the eight-story prototype structure is established,and the time-history analysis is carried out.The results show that the low-rise keyway and sleeve connection wall-panel structure can meet the three-level seismic fortification requirements of the seismic code’ no damage under small earthquake,repairable under moderate earthquake and no collapse under large earthquake ’ in the 6 degree seismic fortification area.This thesis contains 147 figures,35 tables and 79 references.