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HANDBOOK OF STRUCTURAL STEELWORK. EUROCODE EDITION. First text page_Layout 1 04/10/2013 14:26 Page 1
This publication provides guidance on the design of steel beams subject to torsion. It owes much to the earlier SCI publication P057 Design of members subject to combined bending and torsion prepared by Nethercot, Salter and Malik and published in 1989.
The geometric properties that fully define the cross-section are: total height h, flange width b, web thickness t w, flange thickness t f, and root radius r. The notation is defined in EN1993-1-1 §1.7 which is reproduced in the figure above.
The outer rounding radius ro and the inner rounding radius r i are nominal values to be used in calculations and they are specified in the design standards EN 10210-2 §A.3 for hot finished structural hollow sections and EN 10219-2 §B.3 for cold formed structural hollow sections.
Introduction. Structural engineers occasionally need to determine the section properties of steel shapes not found in the current edition of the Handbook of Steel Construction (CISC 2000). The following pages provide the formulas for calculating the torsional section properties of structural steel shapes.
Fig. 6.1.1: A plate. 6.1.2 Plate Theory. Plates subjected only to in-plane loading can be solved using two-dimensional plane stress theory1 (see Book I, §3.5). On the other hand, plate theory is concerned mainly with lateral loading.
Maximum moment in a circular shaft can be expressed as: T max = τ max J / R (2) where. T max = maximum twisting torque (Nm, lbf ft) τ max = maximum shear stress (Pa, lbf /ft2) R = radius of shaft (m, ft) Combining (2) and (3) for a solid shaft. T max = (π / 16) τ max D3 (2b) Combining (2) and (3b) for a hollow shaft.
