Shear Capacity of RC and PC Beams Using FRP Reinforcement


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Title: Shear Capacity of RC and PC Beams Using FRP Reinforcement

Author(s): S. Tottori and H. Wakui

Publication: Special Publication

Volume: 138


Appears on pages(s): 615-632

Keywords: beams (supports); fiber reinforced plastics; flexural strength; mechanical properties; prestressed concrete; reinforced concrete; shear properties; Structural Research

Date: 9/1/1993

Utilizing fiber reinforced plastic (FRP) reinforcement for concrete guideway structures in a superconductive magnetically levitated train system is desirable because FRP reinforcement is diamagnetic. For the design of guideway structures using FRP reinforcement, performance of structural reinforced concrete (RC) and prestressed concrete (PC) members must be understood. Flexural behavior of these members can be predicted by conventional design procedures, taking the mechanical properties of FRP reinforcement into account. However, shear-resisting behavior of RC and PC members has not yet been clarified, for the following reasons. 1. Unlike flexural behavior, shear-resisting behavior is complicated. 2. An experimental equation for shear capacity of RC members using reinforcing steel does not appear to be applicable, since such mechanical properties as Young's modulus and elongation are different from those of reinforcing steel. Under these circumstances, the authors carried out a basic experiment on shear capacity of rectangular beams using FRP tendons and FRP shear reinforcement. As a result, the following factors are elucidated. 1. Shear capacity of RC beams without shear reinforcement can be predicted to some degree by taking into account the tension stiffness of FRP reinforcement. 2. It seems possible to predict contribution of prestress to shear capacity from decompression moment. 3. Contribution of FRP shear reinforcement to shear capacity is smaller than the value calculated by truss analogy. The reasons seem to be related to experimental results showing that the maximum strain value of FRP shear reinforcement at shear failure is smaller than the elongation of FRP reinforcement.