Study On Seismic Performance Of Multistory Precast Concrete Shear Wall Structure With Bolted Connections

Precast concrete shear wall structure is a kind of structure widely used in housing industrialization in China.The bearing capacity,stiffness and seismic performance of assembled integral concrete shear wall structure with wet connection are basically the same as that of cast-in-place concrete shear wall,which can meet the requirements of "equivalent cast-in-place".Compared with the wet connection,the dry connection of the assembled shear wall has the advantages of convenient construction,less wet work,greatly improve the construction efficiency.It has a wide application prospect in low and multi-storey residential buildings.In order to popularize the application of precast concrete shear wall in the seismic fortification area of China,the experimental study and numerical analysis of the seismic performance of a new type of precast concrete shear wall structure with bolt connection are carried out in this paper.The main research work of this paper includes the following contents:1.Two full-scale precast concrete shear wall specimens with bolted connections were designed according to the principle of weak connection and strong component,pseudo-static tests were carried out to study the seismic performance.The results show that the failure of the two specimens occurred near the horizontal slotted section between the precast shear wall and the upper over the wall section,and the wallboard itself is basically elastic,which is consistent with the design principle of strong component and weak connection.The main cracks of the two specimens are horizontal seam cracks and bending shear oblique cracks in the upper over the wall segment below the horizontal seam cracks;In the loading process,the horizontal seam gradually forms the through cracks and continuously opens and closes,and the prefabricated wall produces the swing deformation.The flexural bearing capacity of the section of specimen S-1 is controlled by the tensile strength of the high-strength screw rod due to the large thickness of the connecting plate,the high-strength screw rod is broken due to its tensile strength,which is a brittle failure.The deformation capacity of the specimen is poor.The specimen S-2 connecting plate is of small thickness.After bending and yielding,the connecting plate is finally destroyed due to the concrete crushing in the compression zone on both sides of the wall limb under the horizontal seam.The failure of the specimen is plastic failure.The ductility coefficient of the specimen S-2 is between 3.03 and 3.7,which meets the seismic design requirement of greater than 3.0,and the displacement angle is greater than 1/120 of the limit value of the elastic-plastic inter-layer displacement angle under the action of large earthquakes specified in the code,indicating that the specimen still has good deformation performance and seismic performance.Both horizontal seams of the two specimens have bending failure and small shear slip,indicating that horizontal seams have good shear resistance.With the increase of axial pressure ratio,the peak load capacity and stiffness of the specimen also increase.2.On the basis of the experimental study,ABAQUS software was used to conduct numerical simulation analysis of the stress process of the two specimens,and the skeleton curve,failure mode and crack development situation obtained from the analysis were compared with the test results.The analysis results are in good agreement with the test results,indicating that the established analysis model can better simulate the stress process and failure mode of the specimen,and can be used for further research.On the basis of experimental research,the ABAQUS software was used to simulate the stress process of the two specimens,and the skeleton curve,failure mode,crack development and experimental results were compared.The analysis results are in good agreement with the test,indicating that the established analytical model can better simulate the stress process and failure mode of the test piece,which can be used for further research.On this basis,the calculation method of shear wall bearing capacity is given by referring to the code.