• The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal


Title: Shear Behavior of Thermally Damaged Reinforced Concrete Beams

Author(s): Subhan Ahmad, Pradeep Bhargava, and Minkwan Ju

Publication: Structural Journal

Volume: 119

Issue: 4

Appears on pages(s): 251-261

Keywords: elevated temperature; longitudinal reinforcement ratio; shear behavior; shear span-depth ratio; short beam

DOI: 10.14359/51734665

Date: 7/1/2022

Sixteen shear-critical reinforced concrete short beams (RCSB) with different percentages of tension reinforcement were loaded until failure at ambient and after 350, 550, and 750°C temperatures. Elevated temperatures resulted in a higher shear capacity loss in the beams with a lower tension reinforcement. Stiffness of the beams reduced, whereas midspan deflection corresponding to ultimate load increased after elevated temperatures. Load-shear crack width responses indicated a brittle failure in the beams up to a temperature of 350°C. Ductile failure was perceived in the specimens tested after 550 and 750°C. The strains in tension reinforcement corresponding to ultimate load decrease as the exposure temperature increases. Theoretical predictions provided reasonable estimates of shear capacities up to a temperature of 350°C; in contrast, shear capacities of beams exposed to over 550°C were found up to 46% higher. The experimental results were used to develop an equation for the computation of the shear capacity of RCSB after exposure to elevated temperatures.