Structural Behavior Analysis Of Shear Connectors Under Lateral Pressure

In the combined structure,shear connections are the key components of steel and concrete which make them work together,it is of great significance to carry out the corresponding experiment and theoretical research.Push-out test is the most reasonable and economical way to assess the performance of shear connection.The existing push-out test don’t take the pressure between the steel beam and the concrete slab into account.Based on the National Natural Science Foundation "Nonlinear analysis on the steel-concrete composited beams coupled with creep",by improving loading method of push-out test,the lateral pressure was applied to the specimen first and then subjected to shear loading,the mechanical properties of the shear link and PBL connectors were studied,mainly includes the following research work:(1)In order to study the influence of lateral pressure on specimens,designed and completed the eight push-out tests.(2)According to the experimental results,the mechanism of interfacial force transfer was analyzed,and the friction coefficient between the peg and the PBL steel-concrete joint surface under the side pressure was fitted.The finite element analysis software was used to simulate the experimental specimens,and the friction behavior of the steel-concrete interface was establish by the contact element.The comparison between the calculated data and the measured test data verifies the feasibility of the finite element analysis.(3)By analyzing the nonlinear finite element parameters of the stud specimens,the mechanical properties of the shear connections were obtained,and the data support was provided to optimize the simulation analysis and design of the shear connections.(4)The formulas of the ultimate bearing capacity of different codes and scholars were statistically analyzed.By comparing the experimental and calculated values,select the results of similar calculation formula and improvement,and the theoretical calculation formula of ultimate bearing capacity of the test specimen when the side pressure was taken into account was obtained,providing the theoretical basis for estimating the bearing capacity of the specimen under different lateral pressure levels.