Abstract
In this paper, a theoretical study has been concluded using ANSYS-15 software to investigate the performance of reinforced concrete one-way slabs with embedded basalt fibre reinforced polymer (BFRP) bars under monotonic loads. Six slabs have been considered, two were simply supported, and four were continuous each with two-span. Several parameters have been studied, such as continuity condition, reinforcement ratio, the position of the reinforcement and the effect of replacement basalt bars by steel bars. It is found that the finite element analysis (FEA) agree with experimental results in a range of 1% - 9% in deflection compared with the maximum difference of ACI440 committee of 49%. For simply supported slabs, it is found that increasing the reinforcement from 0.2% to 0.5% resulted in increased capacity by 86%. For continuous slabs, it is observed that increasing the reinforcement for top and bottom from 0.2% to 0.5% resulted in increased capacity by 60% while the maximum deflection is reduced by 56%. Moreover, it is found that with an efficient distribution of bars a slab with a reinforcement ratio of 0.7%, the load capacity is improved by 12.5% and a reduction in maximum deflection 46%. Furthermore, it is found that for simply supported slabs, it is better to use higher ratios of BFRP reinforcement,0.5% instead of 0.2% due to a good improvement in capacity. Regarding dissipation in energy, it is found that the difference in predicting toughness by FEA by ANSYS was 1% - 15% for simply supported slabs while for continuous slabs the dissipation in energy was in the range of 20% - 50% compared with experimental results.
Highlights
In the last few decades, polymer composites as glass, carbon, and aramid bars have been adopted as an efficient alternate choice of the steel reinforcing bars which are prone to the corrosion and may cause deterioration of concrete elements and in some situations, the collapse of the structure
It can be concluded that the ACI440 equations result in underestimating the value of deflection at failure relative to experimental results with a range of 15% - 49% corresponding to an absolute difference of 3% - 9% for the results of the present study
It can be observed that the proposed material models for analysis seem to be efficient enough to simulate the behaviour of supported slabs with https://www.londontechpress.co.uk embedded basalt fibre reinforced polymers (BFRP) bars
Summary
In the last few decades, polymer composites as glass, carbon, and aramid bars have been adopted as an efficient alternate choice of the steel reinforcing bars which are prone to the corrosion and may cause deterioration of concrete elements and in some situations, the collapse of the structure. Neela (2010) investigated experimentally the response of concrete slabs reinforced with BFRP bars included polypropylene fibres with two values of volume fraction, namely are 1.0% and 0.5%. Ashraf (2014) studied the performance the supported and continuous concrete slabs with embedded BFRP and carbon fibre reinforced polymer (CFRP) bars. Mahroug et al (2014) tested two supported, and four continuous concrete slabs reinforced two with embedded basalt fibre reinforced polymer BFRP bars. Rihan (2018) conducted an experimental and analytical investigation of the general response of basalt fibre reinforced concrete (BFRC) one-way slabs including embedded basalt FRP bars and glass FRP bars. Some improvement during the moments recorded at cracking and failure stages, mid-span deflection and ductility index have been noticed with increasing content of basalt macro-fibres (BMF) and the ratio of the main reinforcement. The effect of the gradual substitution of BFRP bars with steel bars on the load-deflection curve is investigated in this manuscript
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