Portal and Cantilever Sign/Signal Gantries - TII …

1 Portal and Cantilever Sign/Signal Gantries DN-STR-03010. December 2014. DN Design Standards TRANSPORT INFRASTRUCTURE IRELAND (TII) PUBLICATIONS. About TII. Transport Infrastructure Ireland (TII) is responsible for managing and improving the country's national road and light rail networks. About TII Publications TII maintains an online suite of technical publications, which is managed through the TII. Publications website. The contents of TII Publications is clearly split into Standards' and Technical' documentation.

2 All documentation for implementation on TII schemes is collectively referred to as TII Publications (Standards), and all other documentation within the system is collectively referred to as TII Publications (Technical). This system replaces the NRA Design Manual for Roads and Bridges (NRA DMRB) and the NRA Manual of Contract Documents for Road Works (NRA MCDRW). Document Attributes Each document within TII Publications has a range of attributes associated with it, which allows for efficient access and retrieval of the document from the website.

3 These attributes are also contained on the inside cover of each current document, for reference. For migration of documents from the NRA and RPA to the new system, each current document was assigned with new outer front and rear covers. Apart from the covers, and inside cover pages, the documents contain the same information as previously within the NRA or RPA systems, including historical references such as those contained within NRA DMRB and NRA MCDRW. Document Attributes TII Publication Title Portal and Cantilever Sign/Signal Gantries TII Publication DN-STR-03010.

4 Number Activity Design (DN) Document Set Standards Stream Structures (STR) Publication Date December 2014. Document 03010 Historical NRA BD 51. Number Reference NRA DMRB and MCDRW References For all documents that existed within the NRA DMRB or the NRA MCDRW prior to the launch of TII Publications, the NRA document reference used previously is listed above under historical reference'. The TII Publication Number also shown above now supersedes this historical reference. All historical references within this document are deemed to be replaced by the TII.

5 Publication Number. For the equivalent TII Publication Number for all other historical references contained within this document, please refer to the TII Publications website. Volume 2 Section 2. Part 4. NRA BD 51/14. Portal and Cantilever Sign/Signal Gantries December 2014. St. Martin's House, Waterloo Road, Dublin 4 Tel: +353 1 660 2511 Fax +353 1 668 0009. Email: Web: Summary: This standard sets out the design criteria and considerations for Portal and Cantilever sign / signal Gantries for use over national roads.

6 It updates and replaces the NRA Addendum to BD 51/98. Published by National Roads Authority, Dublin 2014. NRA DESIGN MANUAL FOR ROADS AND BRIDGES. VOLUME 2 ROADS STRUCTURES: DESIGN (SUBSTRUCTURES. AND SPECIAL. STRUCTURES), MATERIALS. SECTION 2 SPECIAL STRUCTURES. PART 4. NRA BD 51/14. Portal AND Cantilever Sign/Signal . Gantries . Contents Chapter 1. Introduction 2. General Design Principles 3. Limit State Design 4. Actions 5. General Design Requirement 6. References 7. Enquiries APPENDIX A: NRA Gantry Figures APPENDIX B: Typical Equipment APPENDIX C: Appearance APPENDIX D: Dynamic Analysis for a Dynamically Sensitive Gantry APPENDIX E: Design of Gantries with Permanent Maintenance Access APPENDIX F: Table of Gantry Features December 2014 i National Roads Authority Volume 2 Section 2.

7 Design Manual for Roads and Bridges Part 4 NRA BD 51/14. 1. INTRODUCTION. Background This Standard supersedes the NRA Addendum to BD51/98. The main changes are: a) Compliance with Eurocodes and removal of references to superseded structural design standards;. b) Restriction of scope to structural design only scheme design is not covered in this Standard;. c) Removal of detailed itemisation of gantry equipment provision. Scope This Standard covers the design of Portal and Cantilever sign and signal Gantries (see Appendix A.

8 Figures) and sets out their structural design requirements in accordance with the National Roads Authority's requirements for the use of Eurocodes. 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 Appendix A, but excluding Cantilever or other traffic signal masts which are covered in NRA BD 94 Design of Minor Structures.

9 This Standard specifies criteria and advice for the structural design of sign and signal Gantries of Portal and Cantilever types for use on national roads including motorways, 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. The selection of suitable sign and signal configurations is outside the scope of this standard. Refer to the NRA MCDRW Series 1800 Volume 4, Road Construction Details, for further information pertaining to the structural form of permissible sign supports.

10 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 design. Definitions and Abbreviations Specific definitions applicable for this Standard are given below: a) 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.