Effective Torsional Stiffness of Equivalent Beams


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Title: Effective Torsional Stiffness of Equivalent Beams

Author(s): Donald J. Fraser

Publication: Journal Proceedings

Volume: 73

Issue: 10

Appears on pages(s): 573-576

Keywords: beams (supports): concrete slabs; elastic analysis; frames: joints (junctions) : reinforced concrete: stiffness;stiffness;methods; structural analysis; torsion.

Date: 10/1/1976

Codes of practice for reinforced concrete buildings permit the use of an equivalent frame for the analysis of beam and slab buildings, The success of the idealization depends in part on realistic data being available concerning the effective size of the equivalent beams. Many rules have appeared dealing with the size of the equivalent beam in flexure. Only recently has there been a rule, in the ACI Building Code, for the torsional stiffness of the equivalent beams. This paper reviews an investigation into the behavior of beam-slab panels subjected to joint rotations. Rules are presented for the evaluation of the torsional stiffness of equivalent beams for a wide range of beam-slab structures. These rules and the current ACI Building Code rules are compared.