Equivalent Frame Method for Beam-Slab Structures


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Title: Equivalent Frame Method for Beam-Slab Structures

Author(s): Donald J. Fraser

Publication: Journal Proceedings

Volume: 74

Issue: 5

Appears on pages(s): 223-228

Keywords: beams (supports); concrete slabs; elastic analysis; fintie elemelt method; flexural strength; floors; frames;modulus of elasticity;moments; reinforced concrete; stiffness;structural analysis.

Date: 5/1/1977

Codes of practice for reinforced concrete buildings permit the use of an equivalent frame for the analysis of real beam-and-slab buildings. The success of the idealization requires that realistic data be available concerning the effective size of the equivalent beams and the initial joint moments corresponding to the type of load on the beam-slab structure. Many different rules appear in codes and other references for the evaluation of this infor-mation. From an extensive investigation of beam-slab structures, based on finite element analyses, simple rules are proposed for the evaluation of the effective flexural stiffness of the equivalent beams. Also, initial joint moments for three types of floor/beam loads may be evaluated.