Numerical Study on Concrete Filled GFRP-Steel Tube under Cyclic Loading

Abstract

For the purpose of investigating the strengthening effectiveness of GFRP on concrete filled steel tube structure under combined seismic loading and comparing with CFRP ones, numerical simulations of quasi-static test are developed by using ABAQUS. The establishment of finite element model is tested to be feasible by comparing the numerical load-displacement hysteretic curves and their skeleton curves with the experimental ones. Further studies are carried out through changing models’ FRP (GFRP/CFRP) thickness, axial compression ratio and cross sectional steel ratio. Simulation results show that specimens with thicker FRP (GFRP/CFRP) equip better energy dissipation capacity and higher bearing capacity. In elastic-plastic stage the stiffness of specimen degradation becomes more serious as axial compression increases. Energy dissipation capacity is enhanced as cross sectional steel ratio increases.

A State-of-the-Art Review on Axial Compressive Behavior of Concrete-Filled Steel Tubes Incorporating Steel Fiber and GFRP Jacketing

“…The GFRP-CFST resembles the mechanical principles of the CFSTs or concrete-filled FRP tubes (CFFTs), and also takes advantage of the mechanical properties of the outer tube and core concrete combination. The steel tube also guarantees higher ductility of the GFRP-CFSTs compared with the CFFTs [29]. The FRP sheets were recommended for use in the circular steel tubes by Teng and Hu [30].…”