Study On Shaking Table Test Of The Sub-structure Of Assembled Shear Wall With Key Groove And Concentrated Reinforcement Connection

With the rapid development of the national construction industry and the strategic goal of green emission reduction,the construction industry has gradually become the future development direction of the construction industry,and the prefabricated building structure system is booming.The assembled building structure system connects the prefabricated components to form the overall structure by reliable connection.Joint joints are often the weak links of assembled buildings.The connection performance of joint joints under earthquake action is the key to the popularization and application of such structures in high intensity areas.This thesis presents a assembled shear wall structure with key groove and concentrated reinforcement connection for medium and high-rise residential buildings in high-intensity areas.The joint connection performance and overall seismic performance of the structure system are studied by shaking table test.The main research work and conclusions are as follows :(1)The connection form of key groove and concentrated reinforcement is proposed,and its structural form and construction assembly process are described in detail.According to the seismic analysis results,the bottom three-story single-span structure of the original building is selected as the sub-structure of this paper.Design and fabrication of a1/2 scale sub-structure model based on similarity theory for shaking table test.(2)The shaking table test of substructure model was carried out.The crack development and failure mode of substructure,dynamic characteristics such as frequency and vibration mode,seismic response such as acceleration,displacement and interlayer shear force,seismic influence parameters such as shear coefficient,base shear force and base tilting moment amplification coefficient are studied and analyzed.The results show that the horizontal and vertical joints of the structure have good connection performance,and the typical cracks are horizontal cracks at the bottom of the precast shear wall.The seismic response of the structure is mainly affected by the first-order vibration mode.With the increase of the peak acceleration of the seismic wave,the first-order vibration mode of the structure gradually develops from the bending shear type to the bending type.Due to the different spectral characteristics of seismic waves,the changes of seismic response and seismic influence parameters of the structure are different,and show nonlinear characteristics with the increase of the peak acceleration of seismic waves.(3)According to the phenomena and results of shaking table test,the seismic performance level and corresponding failure modes of prefabricated shear wall structure are proposed,and the seismic performance evaluation method of assembled shear wall structure is established with the interlayer displacement angle and damage index as quantitative indexes.The overall seismic performance of the assembled shear wall structure with key groove and concentrated reinforcement connection is comprehensively evaluated by interlayer displacement angle and two-parameter damage model.At the same time,the seismic response of prefabricated structure and cast-in-place model structure is analyzed by elastic time history analysis method.The results show that the assembled shear wall structure with the connection form of key groove and concentrated reinforcement has good performance and reliable connection under 8 degree earthquake.The structure can meet the three-level seismic performance index of “no damage under small earthquake,repairable under moderate earthquake and no collapse under large earthquake” in 8degree fortification area.This thesis contains 78 figures,43 tables and 115 references.