T-beams Subject to Combined Bending and Torsion

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Title: T-beams Subject to Combined Bending and Torsion

Author(s): D. W. Kirk and S. D. Lash

Publication: Journal Proceedings

Volume: 68

Issue: 2

Appears on pages(s): 150-159

Keywords: beams (supports);bending;combined stress;cracking (fracturing);deflection; moments;plain concrete;reinforced concrete;research;strains;structural analysis;T-beams;torsion;ultimate strength method.

Date: 2/1/1971

Abstract:
The behavior of plain and reinforced concrete T-beams subjected to pure torsion and combined bending and torsion was investigated. Eight plain and 28 reinforced concrete T-beams, all having the same nominal cross section were tested. Two plain, three longitudinally reinforced, and seven longitudinally and transversely reinforced beams were subjected to pure torsion. Six plain beams and 18 beams reinforced with longitudinal and transverse stell were subjected to various combinations of torque and moment. All beams were loaded in small increments to ultimate load. For each load increment corresponding angles of twist, beam deflections, and reinforcing steel strains were recorded. Cracks were noted as they developed and the final failure surface was recorded. Based on the experimental results, methods were established to predict the ultimate load capacity of fully reinforced T-beams subject to combined bending and trsion. The proposed method of analysis show satisfactory agreement with the experimental results of this tesing program.