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Design Load Combination Factors

by Carl J. Turkstra, Polytechnic Inst of New York, Dep of, Civil & Environmental, Engineering, Brooklyn, NY, USA,



Document Type: Proceeding Paper

Part of: Structural Safety Studies

Abstract:

This paper reviews alternative load combination formats for ultimate limit states in codified structural design. The need for explicit consideration of load-time variations and random phenomena is outlined and practical modelling assumptions are presented. Definitions of load components and constants in two simple basic formats are discussed. Sensitivity to load modelling assumptions is investigated. A normalization scheme covering the range of practical cases for linear analysis of conventional loads is described and the results of an extensive numerical study are summarized. Conclusions include a set of numerical values of load combination factors for use in practical codes and general guidelines concerning combinations to be considered.

Subject Headings: Load factors | Load combinations | Ultimate loads | Structural design | Load and resistance factor design | Standards and codes | Numerical methods

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