Load Combinations in Codified Structural Design

by Carl J. Turkstra, (M.ASCE), Prof. of Civ. Engrg.; McGill Univ., Montreal, Quebec, Canada,
Henrik O. Madsen, Research Assoc.; Dept. of Civ. Engrg., McGill Univ., Montreal, Quebec, Canada,

Serial Information: Journal of the Structural Division, 1980, Vol. 106, Issue 12, Pg. 2527-2543

Document Type: Journal Paper

Abstract: Alternative formats for load combination requirements in structural design codes are examined. Basic alternative models of macro load-time dependence for live, snow, wind, and earthquake loads are reviewed and a sensitivity analysis performed to establish a set of models sufficient for combination studies. On the basis of normalized design loads and a spectrum of influence coefficients, load combination factors in the alternative basic code formats are established. Extensive numerical results are presented for possible use in code development, It is concluded that a companion action approach is preferable to a probability reduction factor approach and a set of potential design values is suggested.

Subject Headings: Load combinations | Seismic loads | Load and resistance factor design | Standards and codes | Model analysis | Snow loads | Wind loads |

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