UNSPECIFIED. (1994) CALIBRATION OF SAFETY FACTORS GAMMA-M FOR COMPOSITE STEEL AND CONCRETE BEAMS IN BENDING. PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-STRUCTURES AND BUILDINGS, 104 (2). pp. 193-203. ISSN 0965-0911

Abstract

In the limit state design of composite beams, distinct partial safety factors gamma(M) are required for structural steel, concrete, reinforcement, and shear connection. A new method for the statistical determination of these factors is developed from the existing procedure for calibrating gamma(M) for steel components, applicable to any structural element composed of more than one material. It is applied to test data on 121 beams with full or partial shear connection. The values of gamma(M) given in the ENV version of Eurocode 4: Part 1.1 are found to provide the intended margins of safety, and to have appropriate ratios, one to another. Any proposals to use a lower value of gamma(M) should be supported by evidence (or linked with procedures to ensure) that the relevant coefficient of variation in practice is correspondingly lower than the value assumed here. These values are based mainly on calibration work for Netherlands building codes, and should be checked against EN specifications, when available.

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