Numerical Analysis of Behavior of Glass Fiber-Reinforced Polymer Bar-Reinforced Concrete Beams under Impact Loads

Abstract

This paper numerically investigates the behavior of glass fiber-reinforced polymer (GFRP) bar-reinforced concrete beams (GFRP-RC beams) under low-velocity impact loads. A finite element model has been developed and calibrated against the experimental investigation results of six GFRP-RC beams. The results of the numerical analysis have been found in very good agreement with the experimental investigation results. The finite element model captured the failure modes, crack profiles, midspan deflection, impact and reaction forces, and dynamic strain of the GFRP-RC beams. Moreover, a parametric study has been carried out to investigate the influence of the reinforcement ratio, compressive strength of concrete, drop mass, drop velocity, and impact energy on the response of GFRP-RC beams under lowvelocity impact loads. It was found that the drop mass and velocity significantly influenced the damage profiles of the beams, and the reinforcement ratio significantly influenced the midspan deflection and reactions at the support.

Flexural behaviour of ambient cured geopolymer concrete beams reinforced with BFRP bars under static and impact loads

“…In this study the KCC model was also used to model GPC material because there is no verified material model for GPC yet. To model the performance of GPC material, the default parameters in *Mat_072R3 need be modified and calibrated as GPC is more brittle than OPC [40]. The default parameters of OPC and the modified parameters of GPC in this study are listed in Table 6.…”

“…Concrete structures may be subjected to impact loads, such as rock fall, vehicle impact, and terrorist attacks during their service life. Previous studies mainly focused on the impact behaviour of OPC beams reinforced with conventional steel reinforcements [36][37][38][39] and very limited studies on the impact behaviour of OPC beams reinforced with FRP bars [32,33,40,41] were reported in recent years.…”

“…The effects of reinforcement ratio, concrete strength, and dropping height were investigated and an average dynamic amplification factor (DAF) of 1.15-1.17 of the experimental dynamic moment capacity was obtained with respect to the static moment capacity. Numerical models were also built to investigate the influence of reinforcement ratio, concrete strength, drop weight, drop velocity, and impact energy on the responses of OPC beams reinforced with GFRP bars [40]. Saleh et al [41] explored the shear behaviour of OPC beams reinforced with GFRP bars by varying the stirrup spacing and dropping height.…”

Numerical Investigation on the Dynamic Responses and Failure Criterion of RC Beam Under Impact

“…In recent years, dynamic responses of reinforced concrete (RC) members under impact have drawn much more attention. Some researchers have used the drop hammer device or the lateral impact device to carry out impact tests on reinforced concrete members (Fujikake et al, 2009;Sha and Hao, 2013;Zhao et al, 2017;Ye et al, 2021), and other researchers have used numerical simulation methods to carry out impact analysis on reinforced concrete members (Cai et al, 2017;Saleh et al, 2019;He et al, 2020;Tran et al, 2021). Several impact tests have primarily been performed to study the dynamic responses of RC beams under impact.…”

Shear behaviour of ambient cured geopolymer concrete beams reinforced with BFRP bars under static and impact loads

“…The dynamic amplification factor (DAF) of 1.15-1.17 was obtained by calculating the ratio of dynamic moment capacity to static moment capacity. Based on the tested beams in [22], Saleh et al [24] built a numerical model and calibrated it against the test results. Parametric studies showed that given similar initial kinetic energy of the drop weight, higher impact velocity could lead to higher impact and reaction forces but lower midspan deflection while the crack pattern changed from flexuredominant to shear-dominant.…”