Nonlinear modeling for composite plate shear walls-concrete filled structures

This paper proposes modeling recommendations, including constitutive model parameters for concrete and steel for nonlinear and macroscopic simulation of Composite Plate Shear Walls -Concrete Filled (C-PSW/CF) structures. Predictive equations are developed to determine the constitutive models of confined and unconfined concrete and steel faceplates, considering the buckling and fracture effects. A comprehensive database consisting of the test results of 37 C-PSW/CF specimens with and without endplates and boundary elements is collected and used to assess the required constitutive model parameters. Based on the validated macro model, pre-dictive equations for backbone curves of unconfined and confined concrete and steel faceplates are proposed, all having high accuracy (R2 values larger than 0.9). The proposed modeling rec-ommendations and constitutive models are further validated using a wide range of finite element analyses performed on prototype composite shear walls under monotonic loading. The proposed equations and modeling recommendations efficiently simulate the seismic behavior of C-PSW/CF structures with aspect ratios larger than or equal to 1.