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DESIGN MANUAL FOR ROADS AND BRIDGES

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  • November 2004

    DESIGN MANUAL FOR ROADS AND BRIDGES

    VOLUME 2 HIGHWAY STRUCTURES:DESIGN (SUB-STRUCTURES ANDSPECIAL STRUCTURES),MATERIALS

    SECTION 2 SPECIAL STRUCTURES

    PART 1

    BD 26/04

    DESIGN OF LIGHTING COLUMNS

    SUMMARY

    This Standard has been updated to incorporate theprovisions of BS EN 40 and supersedes BD 26/99.

    INSTRUCTIONS FOR USE

    This is a revised document to be incorporated into theManual.

    1. Remove existing contents page for Volume 2 andinsert new contents page for Volume 2 datedNovember 2004.

    2. Remove BD 26/99 from Volume 2, Section 2 andarchive as necessary.

    3. Insert BD 26/04 into Volume 2, Section 2, Part 1.

    4. Archive this sheet as appropriate.

    Note: A quarterly index with a full set of VolumeContents Pages is available separately from TheStationery Office Ltd.

  • BD 26/04

    Design of Lighting Columns

    THE HIGHWAYS AGENCY

    SCOTTISH EXECUTIVE

    WELSH ASSEMBLY GOVERNMENTLLYWODRAETH CYNULLIAD CYMRU

    THE DEPARTMENT FOR REGIONAL DEVELOPMENTNORTHERN IRELAND

    DESIGN MANUAL FOR ROADS AND BRIDGES

    Summary: This Standard has been updated to incorporate the provisions for BS EN 40and supersedes BD 26/99.

  • Volume 2 Section 2Part 1 BD 26/04

    November 2004

    REGISTRATION OF AMENDMENTS

    Amend Page No Signature & Date of Amend Page No Signature & Date ofNo incorporation of No incorporation of

    amendments amendments

    Registration of Amendments

  • Volume 2 Section 2Part 1 BD 26/04

    November 2004

    REGISTRATION OF AMENDMENTS

    Amend Page No Signature & Date of Amend Page No Signature & Date ofNo incorporation of No incorporation of

    amendments amendments

    Registration of Amendments

  • VOLUME 2 HIGHWAY STRUCTURES:DESIGN (SUB-STRUCTURES ANDSPECIAL STRUCTURES),MATERIALS

    SECTION 2 SPECIAL STRUCTURES

    PART 1

    BD 26/04

    DESIGN OF LIGHTING COLUMNS

    Contents

    Chapter

    1. Introduction

    2. Dimensional Limitations

    3. Use of British Standards and Standards Issued byOverseeing Organisations

    4. Glass Fibre Reinforced Plastic (GFRP) LightingColumns

    5. Doors in Lighting Columns

    6. Wall Mounted Brackets

    7. Attachments to Lighting Columns

    8. Flange Plates and Foundations

    9. References

    10. Enquiries

    Annex A: Guidance for Weld Classification

    Annex B: Determination of Shape Coefficients byTesting

    Annex C: Detailed Design of Flange Plates

    DESIGN MANUAL FOR ROADS AND BRIDGES

    November 2004

  • Volume 2 Section 2 Chapter 1Introduction

    motorways. The requirements for breakaway columnsare outside the scope of this Standard.

    Implementation

    1.6 This Standard should be used forthwith on allschemes for the construction and improvement of trunkroads, including motorways, currently being prepared,provided that, in the opinion of the OverseeingOrganisation, this would not result in significantadditional expense or delay progress. DesignOrganisations should confirm its application toparticular schemes with the Overseeing Organisation.Where the Overseeing Organisations contractdocuments are based on the Specification for HighwayWorks (MCHW 1) use of this Standard is mandatory. InNorthern Ireland this Standard should be used on allschemes for the construction and improvement to roadsdesignated by the Overseeing Authority.Part 1 BD 26/04

    1. INTRODUCTION

    General

    1.1 This Standard covers the use of BS EN 40 for thedesign of lighting columns made from steel, aluminium,and concrete. It sets out the Overseeing Organisationsparticular requirements where these differ from, or areadditional to those given in the British Standard. Inaddition, the Standard gives the requirements forlighting columns made essentially from glass fibrereinforced plastic (GFRP). Since this material is beingintroduced in lighting columns for the first time it maybecome necessary in due course to review therequirements, on the basis of their performance inservice.

    1.2 This Standard updates and supersedes BD 26/99.The major changes are as follows:(i) This Standard has been updated to incorporate

    the provisions of BS EN 40.

    1.3 Where lighting columns are procured through acontract incorporating the Specification for HighwayWorks (MCHW 1) products conforming to equivalentstandards or specifications of other member states ofthe European Economic Area will be acceptable inaccordance with the terms of the 104 and 105 Series ofClauses of that Specification. Any contract notcontaining these Clauses must contain a suitable clauseof mutual recognition having the same effect regardingwhich advice should be sought.

    1.4 Where this Standard requires tests to be carriedout the results of tests undertaken by a body orlaboratory in a member state of the European EconomicArea will be accepted provided that the body orlaboratory offers suitable and satisfactory evidence oftechnical and professional competence andindependence. This requirement will be satisfied if thebody or laboratory is accredited in a member state ofthe European Economic Area in accordance with therelevant parts of the EN45000 series of standards forthe tests carried out.

    Scope

    1.5 This Standard sets out the design requirementsfor lighting columns and wall mounted brackets madeNovember 2004

    from steel, aluminium, concrete and glass fibrereinforced plastic for use on trunk roads including1/1

  • Volume 2 Section 2Part 1 BD 26/04

    November 2004 2/1

    Chapter 2Dimensional Limitations

    2. DIMENSIONAL LIMITATIONS

    2.1 The dimensional limitations for the types oflighting columns covered by this Standard shall be:

    For steel, aluminium and concrete columns:

    (i) post top columns< 20 m nominal height

    (ii) columns with brackets< 18 m nominal height

    (iii) bracket projections- not exceeding the lesser of 0.25 x nominalheight or 3 metres

    For glass fibre reinforced plastic columns:

    (i) post top columns< 10 m nominal height

    (ii) columns with brackets< 10 m nominal height

    (iii) bracket projections< 1.5 m

  • Volume 2 Section 2Part 1 BD 26/04

    Chapter 3Use of British Standard

    For reinforcement at door openings the geometricconstraints set out in 3.10 shall be met, and stressranges around door openings need not becalculated. However if these constraints are not3. USE OF BRITISH STANDISSUED BY THE OVERSEEI

    3.1 The design, manufacture and installation oflighting columns shall comply with the relevantrequirements of BS EN 40 as amended by thisStandard and by the Specification for HighwayWorks (MCHW 1), hereinafter called theSpecification.

    3.2 The specific Overseeing Organisationsprocedures for the Technical Approval of lightingcolumns for use on motorways and other trunk roadsare given in BD2 (DMRB 1.1).

    For lighting columns at very exposed sites, theTechnical Approval procedures for high masts,given in BD2 (DMRB 1.1) shall apply.

    Within the United Kingdom, very exposed sites aredefined as:

    (a) sites at high altitude, above 250m;

    (b) sites closer than 5km from the coast; and

    (c) sites subject to significant local funnelling.

    Deflection Criteria

    3.3 The horizontal deflection of each lanternconnection shall conform to class 2 as specified inBS EN 40-3-3: Table 3.

    Fatigue Criteria for Steel Columns

    3.4 The rules set out in 3.5 to 3.12 shall be usedfor steel lighting columns 9m and above in height.These rules may not be applicable to very exposedsites; in such cases the design shall be subjected toTechnical Approval procedures as set out in 3.2.Columns of materials other than steel are notcovered by the rules in this Standard.November 2004s and Standards Issued by the Overseeing Organisations

    ARDS AND STANDARDSNG ORGANISATIONS

    In all cases the procedures to be used shall beagreed between the designer, the client and thetechnical approval authority, see 3.2 above.

    3.5 Fatigue damage is most likely to occur at oradjacent to welds or near sharp corners creating stressconcentrations; particularly vulnerable locations are:

    shoulder joints:- at the weld throat;

    - in the parent metal adjacent to weld; flange plates:

    - at the weld throat between the column andflange;

    - in the parent metal adjacent to the weld; door openings:

    - at welded attachments;

    - at poorly finished cut edges.

    3.6 Generally, when undertaking fatigue checksin accordance with the following rules, nominalstresses shall be used based on nominal sectionproperties. The stress concentrations inherent inthe make-up of a welded joint (arising, forexample, from the general joint geometry and theweld shape) have been taken into account in theclassification of the details. Where indicated,however, the nominal stresses shall be multipliedby stress concentration factors, indicative values ofwhich are provided in the relevant clause.3/1

    met then the requirements of 3.7 shall be followed.

  • Volume 2 Section 2Part 1 BD 26/04

    3

    Chapter 3Use of British Standards and Standards Issued by the Overseeing Organisations

    3a1cT1h23.7 A check on fatigue at and adjacent to eachwelded section, including the ends ofreinforcement at door openings where relevant,shall be undertaken using a stress range

    r, given

    by:

    = stat

    vssr c

    c110.25

    where:

    s

    is the stress calculated at this position for thedesign forces and moments specified inSection 4 of BS EN 40-3-1;

    is the dynamic response factor (Clause 3.2.4of BS EN 40-3-1);

    cstat is the average shape coefficient for the top

    half of the column as used for the staticanalysis and given in Fi

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