VOLUME 2 HIGHWAYS STRUCTURES: DESIGN …

1 VOLUME 2 HIGHWAYS STRUCTURES: DESIGN ( substructures AND special STRUCTURES), MATERIALSSECTION 2 special STRUCTURESPART 4BD 51/14 PORTAL AND CANTILEVER SIGN/SIGNAL GANTRIESSUMMARYThis standard sets out the DESIGN criteria and considerations for portal and cantilever sign and/or signal gantries for use over HIGHWAYS . It updates and expands upon BD51/98, which it FOR USE 1. Remove Contents pages from VOLUME 2 and insert new Contents pages for VOLUME 2 dated May Remove BD51/98 from VOLUME 2, Section 2 which is superseded by this Standard and archive as Insert BD51/14 into VOLUME 2, Section Archive this sheet as : A quarterly index with a full set of VOLUME Contents Pages is available separately from The Stationery Office LtdDESIGN MANUAL FOR ROADS AND BRIDGESMay 2014 DESIGN MANUAL FOR ROADS AND BRIDGESTHE HIGHWAYS AGENCYTRANSPORT SCOTLANDLLYWODRAETH CYMRU WELSH GOVERNMENTTHE DEPARTMENT FOR REGIONAL DEVELOPMENTNORTHERN IRELANDP ortal and Cantilever Sign/Signal GantriesSummary.

2 This standard sets out the DESIGN criteria and considerations for portal and cantilever sign and/or signal gantries for use over HIGHWAYS . It updates and expands upon BD 51/98, which it 51/14 VOLUME 2, Section 2, Part 4 VOLUME 2 Section 2 Part 4 BD 51/14 May 2014 Amend NoPage NoSignature & Date of incorporation of amendmentsAmend NoPage NoSignature & Date of incorporation of amendmentsREGISTER OF AMENDMENTSR egister of amendments May 2014 VOLUME 2 Section 2 Register of Amendments Part 4 BD 51/14 Amend NoPage NoSignature & Date of incorporation of amendmentsAmend NoPage NoSignature & Date of incorporation of amendmentsREGISTER OF AMENDMENTSMay 2014 VOLUME 2 highway STRUCTURES.

3 DESIGN ( substructures AND special STRUCTURES), MATERIALSSECTION 2 special STRUCTURESPART 4BD 51/14 PORTAL AND CANTILEVER SIGN/SIGNAL GANTRIESC ontentsChapter1 Introduction 2 Gantry Type Selection and DESIGN Procedures3 General Principles4 Limit State Design5 Actions 6 General Requirements7 Performance and other requirements for Passively Safe Gantries8 Notification 9 Normative References10 Informative References11 EnquiriesAnnexesA Sign structure FiguresB Risk Assessment and Cost Benefit Analysis for Passively Safe and Non-Passively Safe GantriesC Typical Equipment and Cabling D AppearanceE Dynamic Analysis

4 For a dynamically sensitive GantryF DESIGN of Gantries with Permanent Maintenance AccessG Table of Gantry FeaturesDESIGN MANUAL FOR ROADS AND BRIDGESV olume 2 Section 2 Chapter 1 Part 4 BD 51/14 Introduction May 2014 1/11. This Standard supersedes BD51/98, IAN85/07 and IAN86/07. The main changes are:a) Compliance with Eurocodes and removal of references to superseded structural DESIGN standards;b) Incorporating requirements from Interim Advice Notes IAN 85 and IAN 86;c) Restriction of scope to structural DESIGN only scheme DESIGN is not covered in this Standard;d) Removal of detailed itemisation of gantry equipment This Standard covers the DESIGN of Portal and Cantilever Sign and Signal Gantries (see Annex A Figure 1) and sets out their structural DESIGN requirements in accordance with the Overseeing Organisation s requirements for the use of Eurocodes.

5 It is intended for use in designing permanent and temporary structures which wholly span or are partially cantilevered over the carriageway, hard shoulder and/or hard strip for the purpose of supporting large signs and/ or motorway type signals and/or message signs, such as, but not exclusively, the examples shown in Annex A Figure 1, but excluding cantilever or other traffic signal masts which are covered in BD94 DESIGN of Minor Structures (DMRB ). This Standard specifies criteria and advice for the structural DESIGN of sign and signal gantries of portal and cantilever types for use on trunk roads including motorways (and all purpose roads in Northern Ireland), where any part of the sign or motorway signal and their supporting structure is mounted over the carriageway, central reserve, hard shoulder and/or hard strip.

6 They may be constructed of steel, aluminium, concrete or composite metal and concrete. Other materials may also be considered in accordance with clause The selection of suitable sign and signal configurations is outside the scope of this Scheme DESIGN is not covered by this document. It is assumed that the gantry positions are determined as part of the scheme DESIGN . This Standard only considers the position of the gantry where it has a direct implication on the structural Mandatory SectionsSections of this Standard containing mandatory requirements are identified by being contained in boxes. These requirements must be complied with or a prior agreement to a Departure from Standard must be obtained from the Overseeing Organisation.

7 The text outside boxes contains advice and explanation, which is commended to users for 1 VOLUME 2 Section 2 Introduction Part 4 BD 51/141/2 May 2014 Mutual The requirements and guidance on this document are given on the basis that the construction and/or maintenance of sign and signal gantries will be carried out using the Specification for highway Works (MCHW ). However, products conforming to equivalent standards and specifications of other member states of the European Union and tests undertaken in other member states may be acceptable in accordance with the terms of the 104 and 105 Series of Clauses of that Administration Not This Standard must be used forthwith on all projects for the assessment, DESIGN , construction, operation and maintenance of motorway and all-purpose trunk roads (and all roads in Northern Ireland)

8 Except where procurement of works has reached a stage at which, in the opinion of the Overseeing Organisation, its use would result in significant additional expense or delay progress (in which case the decision must be recorded in accordance with the procedure required by the Overseeing Organisation).Definitions and Specific definitions applicable for this Standard are given below. Carriageway For the purposes of this Standard, the carriageway width is taken to be the traffic running surface which includes all traffic lanes, hard shoulders, hard strips and marker strips, between raised kerbs. In the absence of raised kerbs, it is the width between safety fences, less the amount of set-back.

9 The carriageway width should be measured in a direction at right angles to the line of the raised kerbs, lane marks or edge marking. Eurocodes For the purpose of this Standard, Eurocodes should be taken to include the UK National Annexes and relevant requirements of associated Published Documents. Gantry Generic term for structure supporting signs, signals, Variable Message Signs (VMS) and other equipment. Gantry includes single or multiple portals, single and double cantilevers and combinations of same. Managed Motorway Gantry Managed motorway gantries are those that are designed specifically for use on Managed Motorway Schemes.

10 These gantries have not been designed for possible re-use without modification across the 2 Section 2 Chapter 1 Part 4 BD 51/14 Introduction May 2014 1/3 Outreach of Cantilever Length of cantilever from traffic face of support to tip. Passively Safe Gantries Passively safe gantries are those that are designed to yield or detach under vehicle impact in order to limit injury to the vehicle occupants. Published Documents For the purpose of this Standard, Published Documents contain non- contradictory complementary information (NCCI) to assist in the application of Eurocode Principles. Sign A device carrying directional or other informational message, route information at the approach to a junction.