A Triangular Layered Plate Element for Nonlinear Structural Analysis

摘要

This paper develops a 3-node, 18-DOF triangular layered plate element for the geometric and material nonlinear analysis of reinforced concrete slabs at service loads. It combines a 3-node, 9-DOF triangular membrane element with drilling freedoms and a refined non-conforming 3-node, 9-DOF triangular plate bending element to account for the coupling between membrane and bending actions. The interelement conditions of continuity are satisfied in an average sense and the element performance is improved because of the inclusion of the refined nonconforming element RT9. The element is modelled as a layered system of concrete and equivalent smeared steel reinforcement layers, including crack interface effects and dowel action by using an average shear modulus. The maximum normal stress criterion is employed to detect cracking of the concrete, with a smeared fixed crack model being assumed.