Title:
Effect of Thickness of Concrete Cover on Shear-Torsion
Interaction-An Experimental Investigation
Author(s):
Khaldoun N. Rahal and Michael P. Collins
Publication:
Structural Journal
Volume:
92
Issue:
3
Appears on pages(s):
334-342
Keywords:
angle of twist; beams (supports); bridges (structures); con-cretes;
cover; cracking (fracturing); deformation; reinforced concrete;
shear properties; spalling; strength; torsion.
DOI:
10.14359/9657
Date:
5/1/1995
Abstract:
A study was conducted to investigate the effect of increasing thickness of the concrete cover on behavior of reinforced concrete sections subjected to combined shear and torsion. Seven large reinforced concrete beams with two different thicknesses of concrete cover were tested at different shear-to-torque ratios, and relatively low bending. The testing program, experimental results, and interaction diagrams are presented. It is shown that increasing thickness of the concrete cover can substantially increase the strength of sections subjected to pure shear, or combined shear and torsion, but that it results in an undesirable increase in crack spacing. It is also shown that sections subjected to combined shear and torsion experience lateral curvature.