Research On Seismic Performance Of Precast Reinforced Concrete Wall Pannels Connected With Bolts And Steel Sheets

At present,prefabricated structures have been more and more widely used in China,so the performance of all kinds of prefabricated structure has become a research hotspot,and the connection of prefabricated shear wall is one of them.In this paper,a kind of prefabricated shear wall connected by steel plates and bolts is assumed,and the horizontal pseudo-static testing of 6 specimens is carried out.The finite element simulation is also carried out on the basis of the test.The main research works are as follows:(1)Based on the relevant literature about tests on prefabricated shear walls in the past and the previous work of finite element analysis,the main research parameters of steel plate-bolted prefabricated shear wall test,axial compression ratio and shear-span ratio,are determined.Their specific values are determined at the same time.Relevant design of the specimen manufacture and the pseudo-static loading test process is carried out.(2)The test results are comprehensively analyzed,including the failure mode of each specimen,hysteresis curve,skeleton curve,ductility,strength and stiffness degradation,energy dissipation capacity and other seismic performance,as well as the strain change of steel during loading.Results show that the failure phenomena of each specimen are that the concrete at the bottom of the confined columns was crushed and peeled off and the longitudinal bars of that buckled and were exposed.And the concrete in the shear zone of the wall was broken at a45-degree angle,but there is less damage to the concrete in the steel plate joint area.Steel plate connectors are far from exhaustion.All above shows the characteristics of bending-shear deformation and compression-bending failure.With the increase of the axial compression ratio,the bearing capacity of the specimen will increase accordingly,but the ductility will also decrease;the larger the shear-span ratio,the lower the bearing capacity of the specimen.In terms of ductility,it doesn't show huge difference when the shear-span ratio is low,but the high shear-span ratio can significantly enhance the ductility of the specimen.When the shear span of the specimen is relatively high or low,the energy dissipation capacity of the specimen under one-cycle loading may become worse,but because of the better deformation capacity than the specimen,the performance in the total energy consumption is better when theshear-span is relatively large.(3)The finite element modeling analysis of the test specimen is carried out by using ABAQUS,and the analysis results fit well with the test results.On this basis,further parametric analysis of the structure is carried out.The results show that in the early stages of the test,the horizontal reinforcement in the ventral area of the wall has the highest stress level,while in the later stage of loading,the position of the highest stress is the longitudinal bar of confined columns.The main failure area of concrete is the bottom of confined columns and the oblique distribution zone at an angle of 45 degrees from the bottom edge of the wall.(4)Via the test fitting method,a simplified skeleton curve model for prefabricated shear walls connected by steel plates and bolts is established and expressions are given in three sections.On the basis of experiments and finite element analysis,some suggestions for the design of prefabricated shear walls connected with steel plates and bolts are put forward.