Second-order Inelastic Dynamic Analysis of Three-dimensional Cable-stayed Bridges

This paper presents a second-order inelastic dynamic analysis of three-dimensional cable-stayed bridges including both geometric and material nonlinearities. Geometric nonlinearity is captured by using stability functions to minimize modeling and solution time, while material nonlinearity is considered by adopting the refined plastic hinge model. A computer program utilizing the Newmark beta-method with the assumption of average acceleration is developed to predict the nonlinear inelastic dynamic behavior of the cable-stayed bridges. The accuracy and efficiency of the proposed program are verified by comparing it with SAP2000 and ABAQUS. It can be concluded that the proposed program is capable of accurately and efficiently predicting the nonlinear inelastic dynamic response of cable-stayed bridges.