Lateral Load Equivalent Frame


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Title: Lateral Load Equivalent Frame

Author(s): Fred Allen and Peter Darvall

Publication: Journal Proceedings

Volume: 74

Issue: 7

Appears on pages(s): 294-299

Keywords: building codes: columns (supports) ; deflection;flat concrete plates; frames; high-rise buildings; lateral pressure; loads (forces); plates (structural members); stiffness;structural analysis.

Date: 7/1/1977

Theoretical effective width coefficients for flat plate structures are presented for a wide range of plate aspect ratios and column cross section aspect ratios. Experimental results are given which confirm the theoretical values of effective width coefficient. A new lateral load equivalent frame is proposed that uses the theoretical effective width coefficient. Three hypothetical buildings under lateral load are analyzed for story sways using the various equivalent frames permitted by the codes, and compared to the results for the proposed lateral load equivalent frame. It is shown that the full panel width equivalent frame may seriously underestimate lateral load sways if the column stiffnesses are not reduced.