Abstract
In practice, it is common for circular concrete-filled CFRP-steel tube (C-CF-CFRP-ST) member severing under eccentric load, but there are few related investigations on its mechanical behavior currently. In this study, experimental study and finite element analysis are employed to reveal the static behavior of circular concrete filled CFRP-steel tube under eccentric compression. Total 32 C-CF-CFRP-ST specimens, taking the slenderness ratio (λ) and eccentric ratio (e) as principal parameters, were designed and tested firstly, obtaining the failure modes, N-um curve and the strains in the steel tube and CFRP It was found that the damage of concrete became more serious with the decrease of the slenderness ratio but got mitigated with the increase of eccentricity. Additionally, it was indicated that the N-um curve of C-CF-CFRP-ST consisted of three stages, namely elastic stage, elastic-plastic stage and plastic stage. In the elastic-plastic stage, the damage is gradually accumulated in CFRP and concrete, and the specimens finally exhibited ductile failure in the end of plastic stage. In the entire loading process, CFRP has almost same strains compared to the steel tube. Following the experimental study, finite element analysis was conducted to investigate the static behavior of C-CF-CFRP-ST comprehensively. The proposed finite element model reproduced the compressive behavior of C-CF-CFRP-ST, in terms of failure modes and N-um curves. The influence of material strength, layers of CFRP and steel ratio on the static behavior of C-CF-CFRP-ST specimens were then studied through numerical parametric study. In the end, equations for predicting the bearing capacity of C-CF-CFRP-ST are proposed, and the predicted static strengths of the specimens are basically consistent with the experimental results.
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