Civil Engineering Association

SCI P057: Design of Members Subject to Combined Bending and Torsion

The causes of torsional loading on structural members are discussed and those situations in which the explicit consideration of torsion needs to form part of the design calculations are identified. The basic theory of the torsion of both open and closed steel sections is presented. Solutions of the resulting equations in terms of both design charts and formulae for a selection of applied torsional loadings and support conditions are provided. A simple method for combining the effects of torsion and bending, consistent with the approach of BS 5950: Part I is presented. The complete design approach for combined bending and torsion is illustrated by means of a number of worked examples. These show that design will frequently be governed by the need to restrict twisting at working load to acceptable levels, rather than by considerations of ultimate strength.

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SCI P057 Design of members subject to combined bending and torsion

Size: 4.60 MB | Format: PDF | Quality: Unspecified | Year: Reprint 1997 | pages: 128

This publication seeks to provide authoritative guidance for the design of steel structures subjected to combined ending and torsion. In most cases, however, it should be possible to avoid the introduction of significant torsion, by paying attention to detail andch oosing a load path fors uch an alternative. This publication is, therefore, concerned with the minority of cases where the loads have to be applied eccentrically with respect to the shear centre. Afterb r iae f discussion of the background theory, simple methods of evaluating torsional stresses and deformations are detailed, and worked examples illustrating the use of tables and charts included in the publication are provided.

The text has been prepared by Professor D A Nethercot of Nottingham University and Messrs. P R Salter and A S Malik of the Steel Construction Institute and reviewed by Mr J C Taylor and Dr R Narayanan of The Steel Construction
Institute.

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