| In reinforced concrete slab-column structure,the mechanical properties and failure characteristics of the slab-column structures are more complex,because of the asymmetry of the edge joint and the corner joint,there are few methods to study the punching shear behavior.In order to establish effective and reasonable slab-column connection test and numerical simulation method,this paper uses a 3D grid-beam model improved to doing finite-element analysis based on Open SEES,with doing the numerical analysis of punching shear behavior and validation of the model parameters.The simulation results are in good agreement with the test results,it verifies the rationality and reliability of the model,and it provides a theoretical reference for the revision of the specification and design of slab column connections.1)The calculation formulas for punching shear of edge and corner joints are summarized and compared,and combined with Chinese code GB 50010-2010 with two foreign design codes(ACI 318-14,EC2-04),and the paper analysis them contrastively with existing test.The results show that they are different,and impact of the critical section perimeter and the reinforcement ratio are considered in China codes.2)This paper establishes modified 3D grid-beam model based on Open SEES.Nonlinear finite element analysis of 6 reinforced concrete slab-column edge joints are carried out.The simulation results are in good agreement with the test results.The rationality and reliability of the model are verified and then it carries out parameter analyses of the ratio of reinforcement,concrete strength and deformation distribution.3)Nonlinear finite element analysis of 3 reinforced concrete slab-column corner joints are carried out.The simulation results are in good agreement with the test results.The rationality and reliability of the model are verified and then it carries out parameter analyses of concrete strength and column size. |
