Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Computers and Concrete Volume 21, Number 6, June 2018 , pages 607-722 DOI: https://doi.org/10.12989/cac.2018.21.6.607 |
|
|
|
3-D finite element modelling of prestressed hollow-core slabs strengthened with near surface mounted CFRP strips |
||
Karam Mahmoud, Puneet Anand and Ehab El-Salakawy
|
||
| Abstract | ||
| A non-linear finite element model (FEM) was constructed using a three-dimensional software (ATENA-3D) to investigate the effect of strengthening on the behavior of prestressed hollow-core (PHC) slabs with or without openings. The slabs were strengthened using near surface mounted (NSM)-carbon fiber reinforced polymer (CFRP) strips. The constructed model was validated against experimental results that were previously reported by the authors. The validated FEM was then used to conduct an extensive parametric study to examine the influence of prestressing reinforcement ratio, compressive strength of concrete and strengthening reinforcement ratio on the behavior of such slabs. The FEM results showed good agreement with the experimental results where it captured the cracking, yielding, and ultimate loads as well as the mid-span deflection with a reasonable accuracy. Also, an overall enhancement in the structural performance of these slabs was achieved with an increase in prestressing reinforcement ratio, compressive strength of concrete, external reinforcement ratio. The presence of openings with different dimensions along the flexural or shear spans reduced significantly the capacity of the PHC slabs. However, strengthening these slabs with 2 and 4 (64 and 128 mm2 that represent reinforcement ratios of 0.046 and 0.092%) CFRP strips was successful in restoring the original strength of the slab and enhancing post-cracking stiffness and load carrying capacity. | ||
| Key Words | ||
| hollow-core slabs; strengthening; openings; near surface mounted technique; CFRP strips finite element modeling | ||
| Address | ||
| Karam Mahmoud: Department of Civil Engineering, University of Manitoba, Winnipeg, Manitoba, Canada; Department of Civil Engineering, Assuit University, Assuit, Egypt Puneet Anand and Ehab El-Salakawy: Department of Civil Engineering, University of Manitoba, Winnipeg, Manitoba, Canada | ||