Numerical Investigation on Steel Square HSS Columns Strengthened with Polymer-mortar
Advances in Research,
This paper presents the results of finite element (FE) analysis of axially loaded square hollow structural steel (HSS) columns, strengthened with polymer-mortar materials. Three-dimensional nonlinear FE model of HSS slender columns were developed using thin-shell element, considering geometric and material nonlinearity. The polymer-mortar strengthening layer was incorporated using additional layers of the shell element. The FE model has been performed and then verified against experimental results obtained by the authors . Good agreement was observed between FE analysis and experimental results. The model was then used in an extended parametric study to examine selected AISC square HSS columns with different cross-sectional geometries, slenderness ratios, thicknesses of mortar strengthening layer, overall geometric imperfections, and level of residual stresses. The effectiveness of polymer-mortar in increasing the column’s axial strength is observed. The study also demonstrated that polymer-mortar strengthening materials is more effective for higher slenderness ratios. An equivalent steel thickness is also accounted for the mortar strengthened HSS columns to discuss the effectiveness of polymer-mortar strengthening system. The polymer-mortar strengthening system is more effective for HSS columns with higher levels of out-of-straightness. Level of residual stress has a slight effect on the gain in the column’s axial strength strengthened with polymer-mortar.
- Finite element
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Torabi H, Shariati M. Buckling analysis of steel semi-spherical shells with square cutout under axial compression. Strength of Materials. 2014;46(4):531-542.
Jaehong Lee, Huu Thanh Nguyen, Seung-Eock Kim. Buckling and post buckling of thin-walled composite columns with intermediate-stiffened open cross-section under axial compression. International Journal of Steel Structures. 2009;9(3):175-184.
Bambach MR. 6-Strengthening of thin-walled (hollow) steel sections using fibre-reinforced polymer (FRP) composites. Rehabilitation of Metallic Civil Infrastructure using Fiber Reinforced Polymer (FRP) Composites. 2014;140-168.
Law KH, Gardner L. Buckling of elliptical hollow section members under combined compression and uniaxial bending. Journal of Constructional Steel Research. 2013; 86:1-16.
Key PW, Hancock GJ. An experimental investigation of the column behavior of cold formed square hollow sections. Research Rep. No. R493, School of Civil and Mining Engineering, University of Sydney, Sydney, Australia; 1985.
Vieira L, Rodrigo Gonçalves, Dinar Camotim. On the local buckling of RHS members under axial force and biaxial bending. Thin-Walled Structures. 2018; 129:10-19.
Zhao XL, Zhang L. State-of-the-art review on FRP strengthened steel structures. Engineering Structures. 2007;29(8):1808-1823.
Haedir J, Xiao-Ling Zhao. Design of short CFRP-reinforced steel tubular columns. Journal of Constructional Steel Research. 2011;67(3):497-509.
Shaat A, Fam A. Axial loading tests on short and long hollow structural steel columns retrofitted using carbon fibre reinforced polymers. Canadian Journal of Civil Engineering. 2006;33(4):458-470.
Shaat A, Fam A. Fiber-element model for slender HSS columns retrofitted with bonded high modulus composites. Journal of Structural Engineering, ASCE. 2007a; 133(1):85-95.
Shaat A, Fam A. Finite element analysis of slender HSS columns strengthened with high modulus composites. Steel and Composite Structures. 2007b;7(1):19-34.
Shaat A, Fam A. Slender steel columns strengthened using high-modulus CFRP plates for buckling control. Journal of Structural Engineering, ASCE. 2009;13(1): 2-12.
Urmi Devi, Khan Mahmud Amanat. Non-linear finite element investigation on the behavior of CFRP strengthened steel square HSS columns under compression. International Journal of Steel Structures. 2015;15(3):671-680.
Ritchie A, Fam A, MacDougall C. Strengthening long steel columns of s-sections against global buckling around weak axis using CFRP plates of various moduli. Journal of Composites for Construction, ASCE. 2015;19(4).
Liu X, Nanni A, Silva Pedro F. Rehabilitation of compression steel members using FRP pipes filled with non-expansive and expansive light-weight concrete. Advances in Structural Engineering. 2005;8(2):129–41.
El-Tawil S, Ekiz E. Inhibiting steel brace buckling using carbon fiber- reinforced polymers large-scale tests. Journal of Structural Engineering. 2009;135(5):530-538.
Feng P, Sawulet B, Zhang YH, Ye LP, Bai Y. Experimental study on buckling resistance of steel members strengthened using FRP. International Journal of Structural Stability and Dynamics. 2012; 12(1):153–78.
ANSI/AISC 360-16, Specification for Structural Steel Buildings, American Institute of Steel Construction, Chicago, USA; 2016.
ANSYS program revision 14. ANSYS Inc., Canonsburg, PA.
Bruneau M, Uang C, Whittaker A. Ductile design of steel structures, McGraw-Hill, New York; 1998.
Aghoury MAEl, Hanna MT, Amosh EA. Effect of initial imperfections on axial strength of cold-formed steel single lipped sigma section. EUROSTEEL, Naples, Italy; 2014.
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