Study on Punching Shear Performance of Socket Node of Precast Pier-Pile Foundation
Because of good overall performance,simple construction process and large assembling errors,socket connection has become one of the effective connection methods for prefabricated bridge pier connections.In order to investigate the punching shear failure mode and bearing capacity calculation method of socket connection of pile foundation,the calculation model of the joint was established by the ABAQUS finite element software.The numeri-cal model was verified by the straight shear test of UHPC-NC and the axial compression test of pier-pile caps.The influence law of base plate,grouting joints,socket connection parameters on the punching shear strength transmis-sion mechanism,bearing capacity and failure modes were investigated.And the calculation formula was proposed.Numerical simulation results showed that the force transmission path of the precast pier-pile caps with socket con-nection is from the bottom of the column to the top of the pile;After the peak load,the concrete at the bottom of the cap cracked and failed;The joint bearing capacity is positively correlated with the contact area between the UHPC and the concrete,and the punching bearing capacity of the cap is positively correlated with the thickness of the base plate.In addition,when the ratio of socket depth to base plate height increased from 0.6 to 2.08,the bearing capac-ity of the joint increased by 80.2％,while the bearing capacity of the socket connection and the base plate decreased by 27.7％and 52.9％,respectively.The socket connection parameters had the same trend with the base plate param-eters.The base plate bearing capacity accounted for a larger portion of the bearing capacity of the socket connection,which indicated that the base plate played a dominant role in the contribution to the bearing capacity of the socket node.By analyzing the existing tests and numerical simulations,the contribution coefficients of the base plate and the joint were taken as 1.00 and 0.92 respectively,which provides a basis for the calculation of punching shear bear-ing capacity of similar pier-pile caps with socket connection.
pier-pile foundationsocket nodepunch shear performanceinterfacial cohesionpath of load transferbearing capacity distribution relationship
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