Numerical Simulation of Compressive Failure Behaviors of Concrete-Filled Steel Tube Using Coupled Discrete Model and Shell Finite Element

摘要: After the Great Hanshin earthquake in 1995, a large number of existing concrete structures were retrofitted by steel jacketing method order to adjust increased design loads. In addition, assessment safety against excessive load and restorability performance is becoming increasingly important Japan. assess above reasonably, an accurate evaluation for strength, deformation capacity, localized damage distributions required. This study presents development tool that allows prediction strength deformation, including softening failure behaviors jacket. proposed method, modeled using three-dimensional Rigid-Body-Spring Model (RBSM) which represents as assemblage rigid particles interconnected normal shear springs. The random geometry discretized Voronoi diagram. Constitutive models introduced authors their past studies utilized proven effective simulating cracking material reinforced members. tube, on other hand, finite shell element based degenerated concept displacement-large rotation effects. Interaction between RBSM provided zero-length interface elements consist spring limited compression while Mohr-Coulomb model frictional behavior. accuracy was validated published experimental results concrete-filled tube under uni-axial compression. Results validations confirmed capability provide qualitative measure well reasonable strength.