Experimental Study on Deformation and Failure of Circular Concrete Columns Reinforced with Glass Fiber-Reinforced Polymer Bars

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Title: Experimental Study on Deformation and Failure of Circular Concrete Columns Reinforced with Glass Fiber-Reinforced Polymer Bars

Author(s): Jun Liu, Hongkai Du, Hong Zhou, Zhiling Nan, and Pingjun Nie

Publication: Structural Journal

Volume: 116

Issue: 4

Appears on pages(s): 45-52

Keywords: deformation; failure; full-scale test; GFRP reinforced piles; shear strength

Date: 7/1/2019

Abstract:
The use of glass fiber-reinforced polymer (GFRP) reinforcing bar is growing in shield tunneling projects, although support piles with GFRP bars can be easily penetrated by the shield. It was found that these piles collapsed when receiving the shield, which indicated a hidden danger around the receiving entrance. To study the process of deformation and failure of supporting piles with GFRP bars, full-scale circular GFRP concrete beams and a steel concrete beam were designed and constructed, and loading tests were performed. The results indicated that the deformation process of circular GFRP concrete beams was similar to that of steel concrete beams, but the failure process was different. Circular GFRP concrete beams exhibited shear failure with a crack angle of 45 degrees. A new formula was derived to determine the shear strength of GFRP concrete beams with a circular cross section, and the deviation between the calculation result and the experiment result is 7.94%.