1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 14346:2013Static design procedure for welded hollow-section joints RecommendationsBS ISO 14346:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implem
2、entation of ISO 14346:2013. The UK participation in its preparation was entrusted to T e c h n i c a l Committee WEE/-/1, Briefing committee for welding.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all
3、the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2013. Published by BSI Standards Limited 2013.ISBN 978 0 580 76015 0 ICS 25.160.40 Compliance with a British Standard cannot confer immunityfrom legal obligations.This British
4、 Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2013.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 14346:2013 ISO 2013Static design procedure for welded hollow-section joints RecommendationsProcdure statique de conception
5、 des joints souds section creuse RecommandationsINTERNATIONAL STANDARDISO14346First edition2013-03-15Reference numberISO 14346:2013(E)BS ISO 14346:2013ISO 14346:2013(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2013All rights reserved. Unless otherwise specified, no part of this
6、 publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the
7、 country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 14346:2013ISO 14346:2013(E) ISO 2013 All rights reserved iiiContents PageForeword v1 Scope . 12 Normative ref
8、erences 13 Terms and definitions . 14 Symbols and abbreviated terms . 25 Requirements 56 Materials 127 Joint types .138 Joint classification 199 Limit states design .2310 Partial load and safety factors for loads and resistances 2411 Static design procedures .2411.1 General 2411.2 Design member forc
9、es . 2411.3 Design resistance . 2411.4 Design criteria 2512 Design member forces .2512.1 Analysis methods . 2512.2 Design member forces . 2613 Design criteria 2613.1 Failure modes 2613.2 Uniplanar joints . 2613.3 Uniplanar overlap joints with a CHS, RHS, I- or H-section chord .2813.4 Special uniplan
10、ar joints 2913.5 Multiplanar joints 3014 Design resistance of uniplanar CHS braces to CHS chord joints.3014.1 Design axial resistance 3014.2 Design moment resistance. 3115 Design resistance of uniplanar gusset plates, I- or H-section braces or RHS braces to CHS chord joints .3216 Design resistance o
11、f multiplanar joints with CHS chord .3317 Design resistance of uniplanar RHS braces or CHS braces to RHS chord joints .3417.1 Design axial resistance 3417.2 Design moment resistance. 3618 Design resistance of uniplanar SHS or CHS braces to SHS chord joints 3718.1 Design axial resistance 3718.2 Desig
12、n moment resistance. 3819 Design resistance of uniplanar gusset plate to RHS joints .3820 Design resistance of multiplanar joints with RHS chord .3921 Design resistance of uniplanar CHS or RHS braces to I- or H-section chord joints 4021.1 Design axial resistance 4021.2 Design moment resistance. 4222
13、 Design resistance of uniplanar overlap joints with a CHS, RHS, I- or H-section chord .42Annex A (informative) Quality requirements for hollow sections .46BS ISO 14346:2013ISO 14346:2013(E)iv ISO 2013 All rights reservedAnnex B (informative) Weld details 48Annex C (informative) Partial safety factor
14、s on static strength 50Bibliography .52BS ISO 14346:2013ISO 14346:2013(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO tech
15、nical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
16、 with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft Int
17、ernational Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document ma
18、y be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 14346 was prepared by the International Institute of Welding, which has been approved as an international standardizing body in the field of welding by the ISO Council.Requests for
19、official interpretations of any aspect of this International Standard should be directed to the ISO Central Secretariat, who will forward them to the IIW Secretariat for an official response. ISO 2013 All rights reserved vBS ISO 14346:2013BS ISO 14346:2013Static design procedure for welded hollow-se
20、ction joints Recommendations1 ScopeThis International Standard gives guidelines for the design and analysis of welded uniplanar and multiplanar joints in lattice structures composed of circular (CHS), square (SHS) or rectangular (RHS) hollow sections, and of uniplanar joints in lattice structures co
21、mposed of combinations of hollow sections with open sections under static loading. This International Standard is applicable to CHS or RHS Y-, X- and K-joints and their multiplanar equivalents, gusset plate to CHS or RHS joints, open-section and RHS to CHS joints, and hollow-section to open-section
22、joints.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 630 (all parts),
23、Structural steelsISO 14347, Fatigue Design procedure for welded hollow-section joints RecommendationsISO/TR 25901, Welding and related processes Vocabulary3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 14347, ISO/TR 25901, and the following apply.3.1
24、chord face failurechord plastificationplastic failure of the chord face or plastic failure of the chord cross-section3.2chord punching shearcrack initiation in a hollow-section chord wall leading to rupture of a brace member from the chord member3.3chord side wall failurechord web failureyielding, c
25、rushing or instability (crippling or buckling of the chord side wall or chord web) under the relevant brace member3.4cross-section classificationidentification of the extent to which the resistance (to axial compression or bending moment) and rotation capacity of a cross-section are limited by its l
26、ocal buckling resistanceNote 1 to entry: For example, four classes are given in Eurocode 3 (see EN 1993-1-1) together with three limits on diameter-to-thickness ratio for CHS or width-to-thickness ratio for RHS.INTERNATIONAL STANDARD ISO 14346:2013(E) ISO 2013 All rights reserved 1BS ISO 14346:2013I
27、SO 14346:2013(E)3.5joint configurationtype or layout of the joint or joints in a zone within which the axes of two or more interconnected members or elements intersect3.6local chord member yieldinglocal buckling of the chord connecting face in an overlapped joint3.7local yielding of overlapping brac
28、elocal yielding of overlapping platelocal yielding of bracelocal yielding of platecracking in the weld or in a brace member, or local buckling of a brace member with reduced effective width3.8multiplanar jointin a lattice structure, a joint connecting members situated in more than one plane3.9struct
29、ural properties of a jointresistance to forces and moments in the connected members, deformation and/or rotation capacity3.10uniplanar jointin a lattice structure, a joint connecting members situated in a single plane4 Symbols and abbreviated termsAicross-sectional area of member i (i = 0, 1, 2)Assh
30、ear area of a chord memberbeeffective width of a plate or RHS brace memberbeieffective width of an overlapping RHS brace member at the chord connectionbejeffective width of an overlapped RHS brace member at the chord connectionbe,oveffective width of an overlapping RHS brace member at the overlapped
31、 brace connectionbe,peffective width for punching shearbioverall out-of-plane width of a plate or RHS or I- or H-member i (i = 0, 1, 2)bweffective width for the web of an I- or H-section, or RHS side wallC1coefficient used in the chord stress function Qfas shown in Tables 2, 4, 6, and 9c coefficient
32、 defined in Table 13cscoefficient for effective shear areadeeffective width of a CHS brace memberdeieffective width of an overlapping CHS brace member at the chord connectiondejeffective width of an overlapped CHS brace member at the chord connection2 ISO 2013 All rights reservedBS ISO 14346:2013ISO
33、 14346:2013(E)de,oveffective width of an overlapping CHS brace member at the overlapped brace connectiondioverall diameter of CHS member i (i = 0, 1, 2)dwdepth of the web of an I- or H-section chord member (dw= h02t02r)e noding eccentricity of a joint, shown in Figure 1 h), with a positive value of
34、e representing an offset from the chord centreline towards the outside of the trussFaxaxial force in a brace memberFgap,0*design resistance for the axial force in a chord member at the gap locationFgap,0design value of the axial force in a chord member at the gap locationFi* design resistance of the
35、 joint, expressed in terms of the axial force in member i (i = 1, 2)Fidesign value of the axial force in member i (i = 0, 1, 2)Fpl,0axial yield capacity of a chord memberFs* design resistance for the shear force of the brace to chord connection in an overlapped jointFs,gap,0design value of the shear
36、 force in a chord member at the gap locationFs,pl,0shear yield capacity of a chord memberFs,0design value of the shear force in a chord memberg gap between the brace members in a K- or N-joint, defined in Figure 1 h)gttransverse gap in KK-joints, defined in Figure 1 n)hioverall in-plane depth of a p
37、late or RHS or I- or H-section member i (i = 0, 1, 2)hzdistance between the centres of gravity of the effective parts of the brace (beam) as shown in Table 12i integer subscript used to designate a member of a joint:0 denotes a chord member;1, 2 denote the brace members.In joints with two brace memb
38、ers, 1 normally denotes the compression brace and 2 the tension brace. For a single brace, i = 1 whether it is subject to compression or tension. For an overlap type joint, i is the integer subscript to designate the overlapping bracej integer subscript used to designate the overlapped brace member
39、in overlap type jointskbfactor defined in Table 3b,eff.effective perimeter for local yielding of the (overlapping) bracep,eff.effective perimeter for chord punching shearMidesign value of the moment in member i (i = 0, 1, 2)Miip,*design resistance of the joint, expressed in terms of the in-plane mom
40、ent in member i (i = 1, 2) ISO 2013 All rights reserved 3BS ISO 14346:2013ISO 14346:2013(E)Mip,idesign value of the in-plane moment in member i (i = 1, 2)Miop,*design resistance of the joint, expressed in terms of the out-of-plane moment in member i (i = 1, 2)Mop,idesign value of the out-of-plane mo
41、ment in member i (i = 1, 2)Mpl,0plastic moment capacity of a chord membern factor to account for chord stress in Qffunction (see applicable table)Ovoverlap ratio, expressed as a percentageOqpv=100%Ov, limitoverlap limit for brace shear checkp length of the projected contact area of the overlapping b
42、race member onto the face of the chord, in the absence of the overlapped brace member, in a K- or N-joint, defined in Figure 1 i)Qfchord stress function as defined in Tables 2, 4, 6, and 9Qufunction in the design resistance equation as defined in Tables 2, 3, 4, 6, 7, and 8Qubfunction in the design
43、resistance equation for brace bending as defined in Table 4q length of overlap, measured at the face of the chord, between one brace member toe and the position of the other projected brace member toe, in a K- or N-joint, defined in Figure 1 i)r fillet radius of an I- or H-sectionroexternal corner r
44、adius of an RHSt wall thicknesstiwall thickness (for CHS or RHS) or flange thickness (for I- or H-section) of member i (i = 0, 1, 2)twweb thickness of an I- or H-sectionWel,ielastic section modulus of member i (i = 0, 1, 2)Wpl,iplastic section modulus of member i (i = 0, 1, 2) factor used in the exp
45、ression of Asin Tables 6 and 11 ratio of the mean diameter or width of the brace members, to that of the chordfor T, Y- and X-joints =dddbbb101010or orfor K- and N-joints =+dddbbbbbhhb1201201212022 4or orfor plate to CHS =bd104 ISO 2013 All rights reservedBS ISO 14346:2013ISO 14346:2013(E)for plate
46、to RHS =bb10 ratio of the chord width or diameter to twice the chord thickness =dtbt000022orFpartial load factor on applied loadingMpartial safety factor on joint resistance ratio of the brace member depth to the chord diameter or width =hdhb1010oriincluded angle between brace member i and the chord
47、 (i = 1, 2) slenderness multiplanar factor defined in Tables 5 and 10kdesign stress for chord side wall failureuultimate tensile stressyyield stressyiyield stress of member i (i = 0, 1, 2) angle between the planes in a multiplanar joint defined in Figures 1 j) to o), or resistance factor reduction f
48、actor for (column) bucklingCHS circular hollow sectionRHS rectangular hollow sectionSHS square hollow section5 RequirementsThe following conditions are requirements for hollow-section joints. Steel grades shall be according to Clause 6. Hollow-section joint types shall be according to Clause 7. The
49、nominal wall thickness of hollow sections shall be limited to a minimum of 1,5 mm. For hollow-section chords with a wall thickness greater than 25 mm, the steel shall meet adequate through thickness properties as specified in ISO 630. The ends of members that meet at a joint shall be prepared in such a way that their cross-sectional shape is not modified. Flattened end joints and cropped end joints are not covered in this International Standard. Where brace members are welded to a chord member, the includ
