Mechanics of Structures and Materials: Advancements and Challenges

This paper investigates the random interval uncertain nonlinear time-dependent structural responses of concrete-filled steel tubular arch structures including varying material properties and viscoelastic effects. In the proposed response surface based sampling scheme, Chebyshev surrogate strategy combined with finite element framework is developed to formulate the nonlinear relationships between structural parameters and responses. The probabilistic features of the lower and upper boundsof the time-dependent structural behaviors are comprehensively investigated with different input distributions of random variables. The feasibility and effectiveness of the presented approach are demonstratedby a concrete-filled steel tubular arch problem. The developed method is able to investigate the time-variant behavior of steel concrete composite structures including the intrinsic variations of system parameters