Experimental Study On Seismic Behabior Of Prefabricated Concrete Splccing Beam Shear Wall

At present,the connection between the lower layers of the precast concrete shear wall has the problem that the connection structure between the beams are complicate and difficult to construct.In order to improve the vertical assembly efficiency of prefabricated concrete shear walls,this paper explores the efficient and reliable connection method and manufacturing process between upper and lower concrete shear wall connecting beams,improve the original complex connection method and propose a new design method for connection between beams-shear reinforcement bar vertical connection,and split the beam and wall limbs horizontally.Design and manufacture prefabricated concrete splicing beam specimens and single and double beam specimens under two joint processes,carry out quasi-static test,verify the new vertical connection method between the coupling beams and the horizontal connection of the coupling beam wall split Connection performance;The overall internal force analysis of the spliced beam specimen,the analysis of the end angle of the coupling beam and the finite element refinement modeling analysis,the mechanical analysis of the connection performance of the horizontal connection belt between the splicing coupling beam and the joint beam of the coupling beam And give the construction requirements and recommendations for the shear reinforcement joint connection and the wall joint beam split connection.In order to investigate the limit overlap length of the restrained steel reinforced joints when the wall-and-beam couplings are connected,the tensile test of 8 sets of 16 steelreinforced lap joint specimens is carried out,and the difference is obtained under the limit ratio.In the lap length parameter test piece,the ultimate bond strength between the reinforced concrete and the concrete and the lap joint performance of the steel.The test results show that the theoretical anchorage length of the 8mm diameter steel bar is 0.71 times the safety of the theoretical anchorage length at the ultimate hoop ratio.The lap length of 10 mm,12mm,14 mm,16mm,20 mm diameter steel bars is still recommended to be 1.0 times the theoretical anchoring length according to the original research results.In order to verify the connection performance of the vertical connection between the shear-bonded steel bars and the horizontal connection of the joints between the beams and the joints,the seismic performance tests of three in-line precast concrete shear walls were carried out.The failure mode of the test piece,strain change at key position,loaddisplacement curve,stiffness,ductility,stiffness degradation,energy consumption and other performance indicators.The test results show that the prestressed concrete shear wall with the new horizontal split connection method is mainly subjected to the yielding state,and has good bearing performance.The displacement ductility coefficient is more than 3,and the hysteresis loop shape is full,indicating the new vertical It has good energyconsuming ability to connect and split horizontal connections,and has seismic requirements.In order to further test the reliability of the vertical connection of shear steel bars and the horizontal connection of the joints between the beam and the joints,combined with the seismic test results and related literatures and specifications,from the horizontal joints,the straight section,the oblique section shear capacity,vertical The shear resistance of the precast concrete shear wall with two new joints is analyzed with the straight section shear capacity of the joint,and the calculation formula of shear capacity is given.The calculation results show that the vertical connecting strip between the precast concrete splicing and connecting beam specimens has good working performance in the elastic range,and the overall shearing performance is guaranteed.The straight section bearing capacity of the horizontal beam joints of the girders is less than the slanting beam.Section bearing capacity,lack of straight section shear capacity.Based on the test results,the theoretical internal force analysis and finite element refinement modeling analysis of the test piece show that the two new connection methods have sufficient reliability,and finally propose the specific connection structure detail.