Parametric Investigation of the Shear Behavior of PVA FiberReinforced Concrete Beams

Document Type : Research articles

Authors

1 Civil Engineering Department, Faculty of Engineering at Shoubra, Benha University, Cairo, Egypt.

2 Faculty of Engineering, Benha National University (BNU), Obour, Egypt.

Abstract

This study investigates the influence of five key parameters on the shear behavior of polyvinyl alcohol fiber-reinforced concrete (PVAFRC) beams using the general-purpose finite element software ANSYS. The examined parameters include the volume fraction of PVA fibers (𝑉𝑓), the longitudinal steel reinforcement ratio (𝜌𝑠), the yield strength of longitudinal reinforcement (𝑓𝑦), the transverse reinforcement ratio (𝜌𝑣), and the yield strength of vertical stirrups (𝑓𝑦𝑣). Due to the strong bond between PVA fibers and concrete, an increase in 𝑉𝑓 is expected to enhance the shear capacity of PVAFRC beams. In reinforced concrete (RC) beams, PVA fibers mitigate premature shear crack formation and slow crack propagation by bridging microcracks. Increasing 𝜌𝑠 significantly improves shear capacity while reducing strain ductility and deflection. A minor enhancement in shear capacity is observed with an increase in 𝑓𝑦, whereas a slight reduction in deflection and a marginal improvement in shear failure load is noted with an increase in 𝜌𝑣. Furthermore, increasing 𝜌𝑣 enhances both shear capacity and strain ductility. However, a substantial improvement in both shear capacity and ductility is observed when 𝑓𝑦𝑣 is increased for PVAFRC beams with the same 𝜌𝑣.

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