Experimental and analytical studies on CFRP strengthened circular thin-walled CFST stub columns under eccentric compression. (June 2018)

• Record Type: Journal Article
• Authors: Wang, Jingfeng; Shen, Qihan; Wang, Fengqin; Wang, Wei
• Is Part Of: Thin-walled structures. Volume 127(2018)
• Page Start: 102
• Page End: 119
• Publication Date: 2018-06
• Subjects: Concrete-filled thin-walled steel tube (CFST) -- Carbon fiber reinforced polymer (CFRP) -- Eccentric compressive behavior -- Finite element (FE) modeling -- Simplified empirical formulas; Thin-walled structures -- Periodicals; 690.1
• DOI: 10.1016/j.tws.2018.01.039
• Languages: English
• ISSNs: 0263-8231

Abstract

Abstract: Carbon fiber reinforced polymer (CFRP) strengthened concrete-filled thin-walled steel tubular (CFST) column can improve its load carrying capacity and resolve local bugles or corrosion of thin-walled steel tube. However, little attention to CFRP strengthened CFST columns has been paid. This paper reported an experimental and numerical analysis on eccentric compressive behavior of circular CFST stub columns partially-wrapped by CFRP strips. A series of circular composite columns, including nine CFRP strengthened CFST stub columns and one bare CFST stub column, were tested subjected to eccentric compression. Moreover, a nonlinear finite element (FE) modeling in considering contact interactions of the composite columns was developed and verified by the test results in terms of eccentric load ( N ) - longitudinal shortening ( δ ) curves and failure patterns. Then, the influence of extensive parameters on the eccentric compressive behavior of CFRP strengthened circular CFST columns was also evaluated. Meanwhile, a simplified empirical method on the eccentrically-loaded stub composite columns was proposed on the basis of unified theory. The experimental and analytical data indicated that the eccentric compressive strength of CFRP strengthened circular CFST stub column was obviously influenced by load eccentricity, CFRP confinement factor, steel strength, core concrete strength and CFRP strength. The proposed simplified empirical formulas may provide a considerable approach for designing this type of composite structures in engineering practice. Highlights: Circular CFST stub columns partially-wrapped by CFRP were tested under eccentric compression. The effect of extensive parameters was studied through FE modeling. A simplified design method to predict the strength of CFRP wrapped CFST stub columns was proposed.