Distributed Loads Creating Combined Torsion, Bending, and Shear on L-Beams with Stirrups Torsion, Bending, and Shear on L-Beams with Stirrups

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Title: Distributed Loads Creating Combined Torsion, Bending, and Shear on L-Beams with Stirrups Torsion, Bending, and Shear on L-Beams with Stirrups

Author(s): K. S. Rajagopalan and Phil M. Ferguson

Publication: Journal Proceedings

Volume: 69

Issue: 1

Appears on pages(s): 46-54

Keywords: beams (supports); bending: cracking (fracturing);flexural strength; interactions; L-beams; loads (forces); reinforced concrete; reinforcing steels;research; shear properties; stiffness; stirrups; stresses;torsion.

Date: 1/1/1972

Abstract:
Tests on semicontinuous L-beams with stirrups, under distributed loads creating torsion combined with flexure and shear, showed greater load capacities, around 25 percent, than similar beams under point loads. In this evaluation, shears and torques were taken at a distance from the support. Despite a negative moment yield line in the slab at the face of web, the flange seemed effective in resisting the torsion, The post-cracking torsional stiffness dropped to 3 to 7 percent of the initial stiffness. Strain gage measurements at the point of inflection showed steel stress from torsion varying more nearly with twist angle than with torque itself.