Vol. 21, No. 4, pp. 277-293 (2025)
LATERAL DYNAMIC RESPONSES OF GFRP TUBE CONCRETE-ENCASED
STEEL COMPOSITE COLUMN WITH FIXED ENDS
Hai-Xia Zhang * and Shi-Long Ju
School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 31 October 2024; Revised: 4 January 2025; Accepted: 8 January 2025
DOI:10.18057/IJASC.2025.21.4.1
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ABSTRACT
In this study, a finite element (FE) model of a GFRP tube concrete-encased steel composite column (GTCES) with fixed ends was established to investigate its dynamic behavior under vehicle collisions, with the accuracy of the FE results was verified and calibrated by comparisons with the experimental results. The impact force, lateral displacement, local indentation, reaction and inertia force, bending moment and shear force, energy absorption, damage evolution and failure model, and GFRP tube confinement effect were analyzed, with the results illustrating that the impact process can be divide into three stage. Concrete is an important factor in carrying the impact loads. Subsequently, the influences of the axial force ratio, concrete strength, encased steel yield strength, steel ratio, and impact velocity on the dynamic behavior of the GTCES columns were investigated using parametric experiments. The findings revealed that the peak local indentation decreased by 22.78% and the peak impact force increases by 19.49%, respectively, with increasing the axial force ratio from 0 to 0.6. When the strength of concrete increased from 30 MPa to 40 MPa, the decreases of peak and residual lateral displacements were 23.91% and 25.89%, respectively. Additionally, the more severe damage on the GTCES column was observed at the higher impact velocities.
KEYWORDS
Impact response, Finite element model, GFRP tube, Concrete-encased steel column
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