EXPERIMENTAL STUDY ON SHEAR PERFORMANCE OF EMBEDDED THROUGH SECTION SHEAR STRENGTHENING OF CONCRETE BRIDGE SLABS

Abstract

Abstract: The increase in traffic and heavy trucks loads close to supports have caused shear failure of concrete bridge decks. However, the existing strengthening methods commonly focus on the improvement of bending capacity of concrete bridge decks while ignoring the situation of shear failure problems. This paper reveals a comprehensive study of the behaviour of concrete slabs shear strengthened with Embedded Through Section (ETS) technique with fibre reinforced polymer (FRP) bars. Several structural variables like material type, diameter, and drilling damage were varied to assess the effectiveness of this shear strengthening technique. By analyzing the bearing capacity, crack distribution and failure mode of the test specimen, the results show that the strengthening method can effectively improve the shear capacity of concrete bridge slabs, and the failure mode changes from brittle shear failure to ductile bending failure or bending-shear composite failure. The drilling holes and different type of strengthening bars have little effect on the capacity and deformation of the bridge decks. Additionally, the use of FRP material can improve the durability of the bridge decks. Finally, a two-way theoretical model was proposed to predict the loading-carrying capacity of concrete slabs strengthened with ETS FRP bars. The ultimate strength predicted by this theoretical method shows good agreement with the test results.

Key words: bridge deck slab, embedded through section, shear performance, FRP

CLC Number:

TB332

DONG Peng-cheng, XIA Li-peng, WANG Xu-gang, ZHENG Yu. EXPERIMENTAL STUDY ON SHEAR PERFORMANCE OF EMBEDDED THROUGH SECTION SHEAR STRENGTHENING OF CONCRETE BRIDGE SLABS[J]. Composites Science and Engineering, 2020, 0(10): 5-12.

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