Study On Seismic Behavior Of Hybrid Precast Shear Wall With Partial Vertical Distributed Reinforcements Connected

Our country strongly supports and promotes the development of the industrialization of precast construction.The precast reinforced concrete shear wall structure is beneficial to the improvement of engineering safety,quality,duration and cost,as well as energy saving,emission reduction and consumption reduction.The connection technology of reinforced steel leads to the weak part of the joint,which also directly affects the mechanical performance of the structure.Therefore,the design of the joint which is reasonable and convenient for construction is the key technology in the structural design of the assembled shear wall.In this paper,the seismic behavior of hybrid precast shear wall with partial vertical distributed reinforcements connected has been studied by means of pseudo-static test and ABAQUS numerical simulation,and compared with the cast-in-place shear wall.The precast specimens adopt the hybrid connection mode of the sleeve grouting anchor connection of the marginal vertical reinforcements and the metal corrugated pipe grouting anchor connection of the middle vertical distributed reinforcements,and the edge component area hoop bar and the horizontal distribution steel bar of the vertical steel bar connecting segment are encrypted.Then,based on the established finite element model,the parameter analysis has been carried out.The main conclusions and innovations are as follows:(1)The feasibility of partial connection of vertical distributed reinforcements of hybrid precast shear wall was verified in this paper.The seismic performance of the precast specimens with Partial vertical distributed reinforcements connected studied in this paper is better than that of the cast-in-place test piece,all of them show good seismic performance.Both precast specimens and cast-in-place specimen exhibited flexure-shear failure mode.The bearing capacity,stiffness,ductility and energy dissipation capacity of precast specimens are slightly better than those of cast-in-place specimen,while the strength degradation performance of precast specimens is slightly worse than that of cast-in-place specimen.The anchor connection of the reinforcements can effectively transfer stress before the failure,although at the later stage of loading,the connection failure of the reinforcements appears in the precast specimens,resulting in a small reduce in the bearing capacity,stiffness and energy consumption reduced to some extent,which can still be maintained at a relatively weak performance level,showing that it is feasible to adopt this connection mode.(2)The influence of the number of vertical distributed reinforcements partial connections on the seismic performance of precast specimens was obtained.The test results show that the number of vertical distributed partial connected has little effect on the seismic performance of precast specimens.This mode can be used to simplify site construction.For precast specimens,the decrease in the number of vertical distributed reinforcements connections may result in a decrease in the bearing capacity,stiffness,ductility and energy dissipation of the specimens,but the impact is very small.The connection failure of the reinforcements appeared in the precast specimens can reduce the bearing capacity,stiffness,ductility and energy consumption,effective measures should be taken to ensure the fullness of grouting.(3)The effects of different parameters on the bearing capacity,and the relative horizontal and vertical lateral displacement of the joint of precast shear wall members were obtained.The bearing capacity of the precast members increases slightly with the increase of the number of distributed reinforcements connections,while the number of distributed reinforcements connections has little effect on the relative horizontal and vertical lateral displacement of the joint.For YZ4 member,the bearing capacity increases with the increase of axial compression ratio,while the friction coefficient has little effect on the bearing capacity of the member.At the same time,the increase of friction coefficient at the joint can effectively restrain the relative horizontal lateral displacement of the joint.(4)Reasonable proposals on the design method and construction requirements of precast shear wall member were put forward in combination with the results of test and numerical simulation and the construction requirements.