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Torsional behavior of glass textile‐reinforced concrete beams with minimum transverse reinforcements: Experimental study

Torsional tests for four concrete beams reinforced with glass fiber reinforced polymer (GFRP) bars as torsional longitudinal reinforcements and glass textile grids as torsional transverse reinforcements are conducted to study the possibility in using noncorrosive and cold‐bendable glass textile grids as minimum torsional transverse reinforcements. These beams are compared with three control beams reinforced with GFRP torsional transverse reinforcements. Two investigated variables in this experimental study are the number of layers of textile grids and the orientation of torsional transverse reinforcements. Grade 40 fine‐grained concrete is used for all tested beams. A standard pure torsional test is used to study the torsional behaviors of these beams. The experimental behaviors of the tested beams are compared in terms of recorded torque‐twist curves; strain gauge readings in transverse, longitudinal reinforcements, and concrete at critical positions; observed cracking patterns and failure modes. The experimental results are compared with the recommendations for minimum torsional transverse reinforcements in the existing design codes and guidelines such as the ACI 318‐19, EC2, ACI 440.1R‐15, and CSA S806. The comparison indicates that the existing guidelines are unsafe in estimating the minimum transverse torsional reinforcements for glass textile‐reinforced concrete beams.