Abstract
In this research, a new analytical model is developed to analyze structural members strengthened with FRP systems and subjected to impact loading conditions. ABAQUS based finite element code was used to develop the proposed model. The model was validated against nine beams built and tested with various configurations and loading conditions. Three sets of beams were prepared and tested under quasistatic and impact loadings by applying various impact height and Dynamic Explicit loading conditions. The first set consisted of two beams, where one of the beams was reinforced with steel bars and the other was externally reinforced with GFRP sheet. The second set consisted of six beams, with five of the beams were reinforced with steel bars and one of them wrapped by GFRP sheet. The last set was tested to validate the response of concrete beams reinforced by FRP bar. In addition, beams were reinforced with glass and carbon fiber composite bars tested under Quasi-Static and Impact loading conditions. The impact load was simulated by the concept of a drop of a solid hammer from various heights. The numerical results showed that the developed model can be an effective tool to predict the performance of retrofitted beams under dynamic loading condition. Furthermore, the model showed that FRP retrofitting of RC beams subjected to repetitive impact loads can effectively improve their dynamic performance and can slow the progress of damage.
Highlights
The use of composite sheets and bars can be an effective and usable method for enhancing the structural performance of existing structures when they are subjected to impact loading conditions
Results showed that the energy absorption of beam with CFRP laminates is less than that of beams strengthened with external steel plates
This indicates that using CFRP rebar in reinforced concrete beam under quasi-static load would increase bearing capacity and decrease displacement compare to GFRP rebar
Summary
The use of composite sheets and bars can be an effective and usable method for enhancing the structural performance of existing structures when they are subjected to impact loading conditions. Liao et al (2017) conducted experimental studies and numerical simulation to evaluate the behavior of RC beams retrofitted with High Strength Steel Wire Mesh and High-Performance Mortar (HSSWMHPM) under impact loads The results of both laboratory samples and finite element analysis showed a significantly improvement in the impact resistance as well as an improvement in the ductility of beams reinforced with HSSWM-HPM systems. Khalighi (2009) studied the bond between fiber reinforced polymer and concrete under Quasi-Static and impact loadings They performed experimental tests on FRP reinforced concrete beams and indicated an increase in the bearing capacity of the beams. This table has two sets of data; one is BS (Quasi-Static) data and the second one is impact (as BI-height of hammer).
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