Abstract
Glass Fibre Reinforcement Polymer (GFRP) reinforcements are currently used as internal reinforcements for all flexural members due to their resistance to corrosion, high strength to weight ratios, the ability to handle easily and better fatigue performance under repeated loading conditions. Further, these GFRP reinforcements prove to be the better alternative to conventional reinforcements. The design methodology for flexural components has already come in the form of codal specifications. But the design code has not been specified for beam-column joints reinforced internally with GFRP reinforcements. The present study is aimed to assess the behaviour of exterior beam-column joint reinforced internally with GFRP reinforcements numerically using the ABAQUS software for different properties of materials, loading and support conditions. The mechanical properties of these reinforcements are well documented and are utilized for modelling analysis. Although plenty of literature is available for predicting the joint shear strength of beam-column joints reinforced with conventional reinforcements numerically, but no such study is carried for GFRP reinforced beam-columns joints. As an attempt, modelling of beam-column joint with steel and with GFRP rebars is carried out using ABAQUS software. The behaviour of joints under monotonically increasing static and cyclic load conditions. Interpretation of all analytical findings with results obtained from experiments. The analysis and design of beam-column joints reinforced with GFRP reinforcements are carried out by strut and tie model. Strut and Tie models are based on the models for the steel reinforced beam-column joints. The resulting strut and tie model developed for the GFRP reinforced beam-column joints predicts joint shear strength. Joint shear strength values obtained from the experiments are compared with the analytical results for both the beam-column joints reinforced with steel and GFRP reinforcements. The joint shear strength predicted by the analytical tool ABAQUS is also validated with experimental results.
Highlights
Recent developments in concrete composites have resulted in several new products which aim to improve the strength, stability and Serviceability of the concrete structures
Providing Glass Fibre Reinforcement Polymer (GFRP) bars with L steel clamps changes the failure modes of monotonically loaded exterior beamcolumn joints from joint shear to beam failure
The joint shear strength of joints is increased by 15% if detailed by L bars bent down detail beam reinforcement
Summary
Recent developments in concrete composites have resulted in several new products which aim to improve the strength, stability and Serviceability of the concrete structures. A few structural elements such as beam-column junctions, perforated shear walls may require more rigorous analysis In many such instances, where the behaviour of system cannot be predicted, a useful procedure is to idealise the member or region as a series of reinforcing steel tensile ties and concrete compressive struts, interconnected at nodes to form a truss capable of transmitting the loads to the supports, and detailing the reinforcement . FRP material is corrosion resistant and exhibit several properties that make them suitable as structural reinforcement
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