ISO INTERNATIONAL STANDARD 3545-2 First edition 1989-12-01 Steel tubes and fittings -- Symbols for use in specifications - Part 2: Square and rectangular hollow sections Tubes et raccords en acier - Symboles a utiliser dans les specifications Partie2:Profils creuxa section carree ou rectangulaire Reference number ISO 3545-2 : 1989 (E) national Organization for Standardizatior No reproduction or networking pemited without license from IHS Not for Resale ISO3545-2:1989(E) Foreword ISO(theInternationalOrganizationforStandardization)isaworldwidefederationof national standards bodies (isO member bodies). The work of preparing International Standards isnormallycarriedoutthroughISOtechnicalcommittees.Eachmember body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern mental and non-governmental, in liaison with Iso, also take part in the work. Iso collaborates closely with the International Electrotechnical Commission (IEC) on all mattersofelectrotechnicalstandardization. DraftInternational Standardsadoptedbythetechnical committeesarecirculatedto the member bodies for approvai before their acceptance as International Standards by the Iso Council. They are approved in accordance with ISO procedures requiring at least 75 % approvai by the member bodies voting. International Standard ISO 3545-2 was prepared by Technical Committee ISO/TC 5, Ferrous metal pipes and metallic fittings. iso 3545 consists of the following parts, under the general title Steel tubes and fittings -Symbols for use in specifications: Part 1:Tubes and tubularaccessorieswith circular cross-section Part 2: Square and rectangular hollow sections Part 3: Tubular fittings with circular cross-section ISO 1989 Allrights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland No reproduction or networking pemited without license from IHS Provided by IHS t Not for Resale ISO3545-2:1989(E) INTERNATIONALSTANDARD Steel tubes and fittings - Symbols for use in specifications Part 2 : Square and rectangular hollow sections 1 Scope Ix = moment of inertia about the x axis ThispartofiSO3545definesthemostcommonsymbolswith I, = moment of inertia about the y axis 1] the aim of standardizing and facilitating the use of terminology in standards for steel hollow sections and associated W = section modulus products. W, = section modulus about the x axis 2Fundamental symbols (see figures 1 and 2) Wx= H/2 Ix B = length of side of square hollow section; length of shorter side of rectangularhollow section W, = section modulus about the y axis1) H = length of longer side of rectangular hollow section W.: T = specified thickness B/2 r; = inner corner radius A = cross-sectional area r。= outer corner radius i = radius of gyration 'm = mean corner radius ix = radius of gyration about the x axis rcalc = corner radius used for calculation of properties rmax = maximum permitted outside corner radius A iy, = radius of gyration about the y axis1) 3Symbols for tolerances y See ISO 5252 : 1977, Steel tubes - Tolerance systems iy = A Q = squareness of sides Z = plastic modulus X = concavity or convexity (see figure 3) Zx = plastic modulus about the x axis V = twist (see figure 4) Z, = plastic modulus about the y axis1) 4 Symbols for specifications (see figure 5) J = torsional inertia constant I = moment of inertia C = torsional modulus constant Noreproduction or networking permitted without license from IHS Not for Resale