Na To Sls En 1993-6

SRI LANKA STANDARD NA to SLS EN 1993-6:2018 UDC693.8:621

SRI LANKA NATIONAL ANNEXE TO EUROCODE 3: DESIGN OF STEEL STRUCTURES - PART 6: CRANE SUPPORTING STRUCTURES

SRI LANKA STANDARDS INSTITUTION

SRI LANKA NATIONAL ANNEXE TO EUROCODE 3: DESIGN OF STEEL STRUCTURES - PART 6: CRANE SUPPORTING STRUCTURES

NA to SLS EN 1993-6:2018

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SRI LANKA STANDARDS INSTITUTION No.17, Victoria Place Elvitigala Mawatha Colombo 8 SRI LANKA.

Sri Lanka Standards are subject to periodical revision in order to accommodate the progress made by industry. Suggestions for improvement will be recorded and brought to the notice of the Committees to which the revisions are entrusted. This Standard does not purport to include all the necessary provisions of a contract.

© SLSI 2018 All right reserved. Unless otherwise specified, 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 SLSI.

Committee responsible for this National Annexe The preparation of this National Annexe was entrusted by the Working Group on Formulation of National Annexes to Eurocode 3 - Design of Steel Structures, appointed by the Sectoral Committee on Building & Construction Materials, upon which the following members were represented: Dr.(Ms)MTP Hettiarachchi (Chairperson) Prof. S.Thilakasiri Eng. BVDN Chandrasiri Eng. HMGU Karunarathna Mr.KS Abeygunawardena Eng.(Ms)DW Dhanusekera (Secretary)

University of Moratuwa Sri Lanka Institute for Information Technology

Road Development Authority Central Engineering Consultancy Bureau Sri Lanka Standards Institution Sri Lanka Standards Institution

NA to SLS EN 1993-6:2018

National Annexe (informative) to SLS EN 1993-6:2018 Eurocode 3: Design of Steel Structures – Part 6: Crane supporting structures Introduction This National Annexe has been prepared based on EN 1993-6:2007 incorporating corrigendum July 2009 by the Working Group on Formulation of National Annexes to Eurocode 3 - Design of Steel Structures. It is to be used in conjunction with SLS EN 1993-6: 2016 along with any further revision, amendment or corrigendum thereto. This National Annexe was approved by the Sectoral Committee on Building and Construction Materials and was authorized for publication as a Sri Lanka National Annexe by the Council of the Sri Lanka Standards Institution on 2018-04-26. In the preparation of this standard the assistance derived from the publications of the European Committee for Standardization (CEN) and British Standards Institution (BSI) are gratefully acknowledged.

NA.1

Scope

This National Annexe gives: a) The decisions for the Nationally Determined Parameters described in the following subclauses of SLS EN 1993-6: 2016. • 2.1.3.2(1)P • 2.8(2)P • 3.2.3(1) • 3.2.3(2)P • 3.2.4(1), Table 3.2 • 3.6.2(1) • 3.6.3(1) • 6.1 (1) • 6.3.2.3(1) • 7.3(1) • 7.5(1) • 8.2(4) • 9.1(2) • 9.2(1)P • 9.2(2)P • 9.3.3(1) • 9.4.2(5) b) Decisions on the status of SLS EN 1993-6:2016 informative Annexe A. c) References to non-contradictory complementary information.

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NA to SLS EN 1993-6:2018

NA.2

Nationally Determined Parameters

NA.2.1 General Decisions for the Nationally Determined Parameters SLS EN 1993-5:2016 are given in Clauses NA.2.2 to NA.2.18.

described

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NA.2.2 Design working life [SLS EN 1993 - 6:2014, 2.1.3.2(1 )P] A design working life of 50 years is recommended. NA.2.3

Partial factor F,test for test loads [SLS EN 1993-6:2014, 2.8(2)P] Use the recommended value

NA.2.4

Fracture toughness [SLS EN 1993-6:2014, 3.2.3(1)] The design value of the lowest service temperature for crane supporting structures should be as recommended in NA to SLS EN 1993-1-1:2014, NA.2.6

NA.2.5 Toughness properties for members in compression [SLS EN 1993-6:2014, 3.2.3(2)P] For components under compression, the recommendations given in NA to SLS EN 1993-1-10 should be used. NA.2.6 Through-thickness properties [SLS EN 1993-6:2014, 3.2.4(1), Table 3.2] The recommendations in Table 3.2 should not be used. Instead the recommendations given in NA to SLS EN 1993-1-10:2016, NA.2.2, should be followed. NA.2.7 Suitable rails and rail steels [SLS EN 1993-6:2014, 3.6.2{ 1)] Information on suitable rails and rail steels should be obtained from publications of steel producers. NA.2.8 Special connecting devices for rails [SLS EN 1993-6:2014, 3.6.3(1)] Information on purpose-made fixings and elastomeric bearing pads for rails should be obtained from publications of specialist manufacturers. NA.2.9 Partial factors Mi for resistance [SLS EN 1993-6:2014, 6.1(1)] The partial factors Mi for the resistances of members and cross-sections should be as given in NA to SLS EN 1993-1-1. The partial factors Mi for the resistances of joints and connections should be as given in NA to SLS EN 1993-1-8. NA.2.10 Lateral-torsional buckling resistance [SLS EN 1993-6:2014, 6.3.2.3(1)] The alternative method of assessment given in Annexe A of SLS EN 1993-6:2016 may be used. NA.2.11 Limits for deformations and displacements [SLS EN 1993-6:2014, 7.3(1)] The values recommended in SLS EN 1993-6:2016 should be used.

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NA to SLS EN 1993-6:2018

NA.2.12 Reversible behaviour [SLS EN 1993-6:2014, 7.5(1)] The partial factor M,ser for stresses under characteristic load combinations or test load combinations should be taken as 1.1. NA.2.13 Welded connections to top flanges [SLS EN 1993-6:2014, 8.2(4)] The crane classes to be treated as "high fatigue" should be as recommended in SLS EN 1993-6:2016. NA.2.14 Requirement for fatigue assessment [SLS EN 1993-6:2014, 9.1 (2)] The value for the limiting number of cycles C0 recommended SLS EN 1993-6:2016 should be used.

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NA.2.15 Partial factor for fatigue loads [SLS EN 1993-6:2014, 9.2(1)P] The value for Ff recommended in SLS EN 1993-6:2014 should be used. NA.2.16 Partial factor for fatigue resistance [SLS EN 1993-6:2014, 9.2(2)P] SLS EN 1993-1-9:2014, Table 3.1 should not be used. Instead the recommendations given in NA to SLS EN 1993-1-9:2014, NA.2.5, should be followed, using the fatigue loading given in SLS EN 1991-3. NA.2.17 Local stresses due to wheel loads on the top flange [SLS EN 1993-6:2014, 9.3.3(1)] The crane classes for which the bending stresses T,Ed may be neglected should be as recommended in SLS EN 1993-6:2016. NA.2.18 Multiple crane actions [SLS EN 1993-6:2014, 9.4.2(5)] The values for dup recommended in SLS EN 1993-6:2016 should be used. NA.3

Decisions on the status of informative annexes Annexe A may be used.

NA.4 References to non-contradictory complementary information Annex NA.A (informative) Guidance on the use of runway beams for hoist blocks In addition to checking for resistance, see SLS EN 1993-6:2016, 6.7, the bottom flanges of runway beams for underslung cranes or hoist blocks should be checked for reversible behaviour, see SLS EN 1993-6: 2016, 7.5(3), including the effects of local bending stresses due to wheel loads, see SLS EN 1993-6:2016, 5.8. Although cases with closely spaced wheels are covered in detail in SLS EN 1993-6:2007,6.7, similarly detailed coverage is not included in SLS EN 1993-6:2016, 5.8. This is not usually a problem for underslung cranes, but the wheel spacing of hoist block trolleys is commonly less than the limit of applicability given in SLS EN 1993-6:2016, 5.8(3). Where the longitudinal wheel spacing xw is less than 1.5 times the flange width b, the local bending stresses due to the combined effect of two wheel loads can be estimated from: 5

NA to SLS EN 1993-6:2018  o2,i = c1 c2  o1,i but  o2,I ≥  o1,i if xw < O.75b: if xw ≥ O.75b:

C1 = 1 - 0.2(xw/b) C1 = 1 - 0.15

if xw ≤ b : C2 = 2 - 1.1(xw/b) + 0.2(xw/b)2 if b< xw ≤ 1.5 b: C2 = 1.9 - 1.2(xw/b) + 0.4(xw/b)2 where:  is as defined in SLS EN 1993-6:2016, 5.8(4);  o1,i is the local bending stress ox,Ed or oy,Ed due to one wheel load;  o2,i is the local bending stress ox,Ed or oy,Ed due to two wheel loads. NOTE: This is an approximation based on values tabulated in Appendix G of BS 2853:1957.

Bibliography For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. [1] BS 2853: 1957, The design and testing of steel overhead runway beams [2] SLS EN 1991-3, Actions on structures - Part 3: Actions induced by cranes and machinery [3] SLS EN 1993-1-9:2014, Design of steel structures - Part 1-9: Fatigue [4] NA to SLS EN 1993-1-1 :2014, Design of steel structures - Part 1-1: General rules and rules for buildings [5] NA to SLS EN 1993-1-8, Design of steel structures - Part 1-8: Design of joints [6] NA to SLS EN 1993-1-9:2014, Design of steel structures Part 1-9: Fatigue [7] NA to SLS EN 1993-1-10:2016, Design of steel structures Part 1-10: Material toughness and through-thickness properties.

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