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DESIGN MANUAL FOR ROADS AND BRIDGES

VOLUME 2

SECTION 2 PART 1 BD 94/07

HIGHWAY STRUCTURES: DESIGN (SUB-STRUCTURES AND SPECIAL STRUCTURES), MATERIALS SPECIAL STRUCTURES

DESIGN OF MINOR STRUCTURESSUMMARY Summary This Standard covers the design of minor highway structures, including: lighting columns; cantilever masts for traffic signals and/or speed cameras; CCTV masts; fixed vertical road traffic signs.

It incorporates the provisions of BS EN 40, BS EN 12899, and supersedes BD 26/04, BD 83/01 and BD 88/05. INSTRUCTIONS FOR USE 1. 2. 3. 4. 5. Remove BD 26/04 from Volume 2, Section 2, Part 1. Remove BD 83/01 from Volume 2, Section 2, Part 11. Remove BD 88/05 from Volume 2, Section 2, Part 13. Insert BD 94/07 into Volume 2, Section 2, Part 1. Please archive this sheet as appropriate.

Note: A quarterly index with a full set of Volume Contents Pages is available separately from The Stationery Office Ltd.

February 2007

DESIGN MANUAL FOR ROADS AND BRIDGES

BD 94/07Volume 2, Section 2, Part 1

THE HIGHWAYS AGENCY TRANSPORT SCOTLAND

WELSH ASSEMBLY GOVERNMENT LLYWODRAETH CYNULLIAD CYMRU THE DEPARTMENT FOR REGIONAL DEVELOPMENT NORTHERN IRELAND

Design of Minor StructuresSummary: This Standard covers the design of minor highway structures, including: lighting columns; cantilever masts for traffic signals and/or speed cameras; CCTV masts; fixed vertical road traffic signs. It incorporates the provisions of BS EN 40, BS EN 12899, and supersedes BD 26/04, BD 83/01 and BD 88/05.

Volume 2 Section 2 Part 1 BD 94/07

Registration of Amendments

REGISTRATION OF AMENDMENTS

Amend No

Page No

Signature & Date of incorporation of amendments

Amend No

Page No

Signature & Date of incorporation of amendments

February 2007

Registration of Amendments

Volume 2 Section 2 Part 1 BD 94/07

REGISTRATION OF AMENDMENTS

Amend No

Page No

Signature & Date of incorporation of amendments

Amend No

Page No

Signature & Date of incorporation of amendments

February 2007

DESIGN MANUAL FOR ROADS AND BRIDGES

VOLUME 2

SECTION 2 PART 1 BD 94/07

HIGHWAY STRUCTURES: DESIGN (SUB-STRUCTURES AND SPECIAL STRUCTURES), MATERIALS SPECIAL STRUCTURES

DESIGN OF MINOR STRUCTURESContents Chapter 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Introduction General Principles Dimensional Limitations Use of British Standards and Standards Issued by Overseeing Organisations Design Fibre Reinforced Polymer Composite Lighting Columns Door Openings Wall Mounted Brackets Attachments Flange Plate Connections Between Structure and Foundation Foundations References Enquiries Limit States for Cantilever Masts Fatigue Checks of Steel Structures and Guidance for Weld Classification Detailed Design of Flange Plates Determination of Shape Coefficients by Testing

Annex A Annex B Annex C Annex D

February 2007

Volume 2 Section 2 Part 1 BD 94/07

Chapter 1 Introduction

1. INTRODUCTIONMandatory Sections (iii) Requirements for the design of fixed vertical road signs are given in BS EN 12899: Part 1. These requirements are supplemented by this Standard.

Sections of this document which form part of the standards of the Overseeing Organisations are highlighted by being contained in boxes. These are the sections with which the Design Organisations shall comply, or shall have agreed a suitable departure from standard with the relevant Overseeing Organisation. The remainder of the document contains advice and enlargement which is commended to Design Organisations for their consideration.

It sets out the Overseeing Organisations particular requirements where these augment, or are additional to those given in the British Standard. In addition, the Standard gives the requirements for lighting columns made essentially from glass fibre reinforced plastic (FRP). The technical basis for the clauses on FRP is limited and it may become necessary in due course to review the requirements, on the basis of their performance in service. Where materials other than concrete, steel, aluminium or FRPC are used for other minor structures a departure from standards shall be sought from the Technical Approval Authority.

General 1.1 This Standard covers the use of the relevant parts (as defined herein) of BS EN 40 for the structural design of: lighting columns made from concrete, steel, aluminium, and fibre reinforced polymer composite (FRPC); cantilever masts for traffic signals and/or safety cameras (hereafter called cantilever masts) made from steel; closed circuit television (CCTV) masts made from steel; fixed vertical road traffic sign/signal posts.

Scope 1.2 This Standard sets out the structural design requirements for the following minor highway structures for use on trunk roads including motorways: lighting columns and wall mounted brackets made from concrete, steel, aluminium, concrete and FRPC, including lighting columns mounted on other structures, e.g. on bridges; steel CCTV masts mounted on foundations in the ground. The requirements for CCTV masts mounted on other structures eg gantries are outside the scope of this Standard; cantilever masts made from steel for traffic signals and/or speed cameras. This Standard excludes the design requirements for permanent and temporary cantilever sign and signal gantries for which BD 51 (DMRB 2.2.4) shall be used; fixed vertical road traffic sign/signal posts. This Standard excludes the electronic design requirements of certain traffic signs, as defined in EN 12899-Part 1.

Notes: (i) Guidance and background information in the use of BS EN 40-3-1 and BS EN 40-3-3 for the design of lighting columns is given in PD6547: 2004 This Standard covers the use of The Institution of Lighting Engineers Technical Report Number 7, High Masts for Lighting and CCTV, 2000 Edition (amended 2003), Sections 1 and 2 (ILE TR7) for the design of CCTV masts. This Technical Report was originally developed for high mast lighting and has been revised to include CCTV masts as they have similar features.

(ii)

February 2007

1/1

Chapter 1 Introduction

Volume 2 Section 2 Part 1 BD 94/07

Notes: (i) The structural requirements for lattice structures are outside the scope of this Standard; refer to BS8100 or any other relevant standard. The structural requirements for passively safe structures should comply with this Standard but the passive safety characteristics of such structures are dealt with in EN 12767 with guidance in TA 89. In Northern Ireland this Standard applies to minor structures on all classes of road

(ii)

schemes for the construction and improvement to roads designated by the Overseeing Authority. Where this Standard duplicates or covers requirements in existing standards during a period of co-existence, it shall take precedence unless otherwise agreed with the Overseeing Organisation.

(iii)

Equivalence 1.3 Where minor structures are procured through a contract incorporating the Specification for Highway Works (MCHW 0 to 6) products conforming to equivalent standards or specifications of other member states of the European Economic Area will be acceptable in accordance with the terms of the 104 and 105 Series of Clauses of that Specification. Any contract not containing these Clauses must contain a suitable clause of mutual recognition having the same effect regarding which advice should be sought. 1.4 Where this Standard requires tests to be carried out the results of tests undertaken by a body or laboratory in a member state of the European Economic Area will be accepted provided that the body or laboratory offers suitable and satisfactory evidence of technical and professional competence and independence. This requirement will be satisfied if the body or laboratory is accredited in a member state of the European Economic Area in accordance with the relevant parts of the EN 45000 series of standards for the tests carried out. Implementation 1.5 This Standard should be used forthwith on all schemes for the construction and improvement of trunk roads, including motorways, currently being prepared, provided that, in the opinion of the Overseeing Organisation, this would not result in significant additional expense or delay progress. Design Organisations should confirm its application to particular schemes with the Overseeing Organisation. Where the Overseeing Organisations contract documents are based on the Specification for Highway Works (MCHW 1) use of this Standard is mandatory. In Northern Ireland this Standard should be used on all

1/2

February 2007

Volume 2 Section 2 Part 1 BD 94/07

Chapter 2 General Principles

2. GENERAL PRINCIPLESSiting 2.1 The siting of minor structures shall accord with the TDs and TAs as shown in Table 1 as relevant to the structure considered. This shall include consideration of visibility by the approaching traffic.

TD9 Lighting columns Cantilever masts CCTV masts Road traffic signs

TD18

TD19

TD23

TD33

TD34

TA74

Table 1: TDs and TAs NOTE: Where possible cantilever masts should not be located on under-bridges.

Layout 2.2 All elements of minor structures shall comply with the clearances specified in TD 27 (DMRB 6.1.2) after allowing for deflections due to dead, live, wind and High Vehicle buffeting loads. 2.3 The clear new construction headroom for routes other than high load routes shall be 5,700 mm minimum, as defined in TD 27 Table 8 (DMRB 6.1.2) for Footbridges and Sign/Signal Gantries. Where cantilever masts are sited on high load routes, the clear new construction headroom shall be 6,4