Abstract
This paper presents a numerical investigation on the behaviour of circular double-skin tubular concrete (DSTC) under concentric loading. The numerical analysis is carried out using a three-dimensional non-linear finite element package (3D-NLFEA). In DSTC specimen, the concrete is enclosed by FRP wraps at the outer tube and circular hollow steel (CHS) at the inner tube. The concrete constitutive model is based on the authors developed plasticity-fracture model which uses a non-constant plastic dilation rate for modelling concrete dilation under compression. The nonlinear buckling analysis is included in the analysis. Random material imperfection is used to induced asymmetric failure pattern. Mohr-Coulomb friction model is used to simulate the contact behaviour between concrete and CHS elements. The results from the FEA are compared with the available experimental results. From the comparison, it can be concluded that the use of the authors plasticity-fracture model is in good agreement with the test results.
Highlights
Ductility and strength enhancement of concrete under confinement has received significant attention over more than two decades
This paper presents a numerical analysis of concentrically loaded double-skin tubular concrete (DSTC) specimens using the 3D non-linear finite element analysis (3D-NLFEA) software package
This paper presents a numerical investigation on Double-Skin-Tubular-Concrete (DSTC) with a steel tube at the inner side of concrete and Fiber Reinforced Polymer (FRP) wraps on the outer side of the concrete
Summary
Ductility and strength enhancement of concrete under confinement has received significant attention over more than two decades. As the behavior of confined concrete under both active and passive confinement become well understood which can be reflected by looking at the number of the confinement model for concrete under compression, the research shifted to extend the optimal configuration of confining devices which combines one or two other material that provides confinement to the concrete core. Https://doi.org/10.10 51/matecconf /201927601009 material suppresses the concrete lateral dilations This mechanism improves both strength and ductility of the DSTC specimen. For a medium to heavy confined DSTC specimen, the stress-strain curve shows an always hardening behavior until the failure in the FRP material. This way, the designer could design the performance of the DSTC specimen to be governed by the FRP thickness. The authors’ plasticity-fracture model [9], which is the improvement from the previous model [10, 11], is used as the constitutive model for concrete material. 3D-NLFEA has been used to study confinement for concrete confined with both internal and/ or external confining devices [3, 5,6,7]
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