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Cover of Design and Construction Guidelines for the Delivery of Large Cantilever and Gantry Structures

Pattern and Construction Guidelines for the Delivery of Large Cantilever and Gantry Structures

Publication no: AP-G95-21
ISBN: 978-1-922382-46-7
Published: 19 January 2021

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This guideline documents consistent advice for the design and construction of large cantilever and gantry structures that is aligned with national and international best practice.

Over recent years there take been a number of incidents of structural failures of sign and high mast lighting structures across Australia and New Zealand, primarily due to poor design and construction practices. In addition to the obvious unacceptable prophylactic risks and property damage caused by such incidents, these failures create substantial unforeseen operational costs to repair and modify these assets. This oft results in significant traffic delays and imparts reputational impairment to the governing road authority and other parties involved.

An all-encompassing literature review and stakeholder engagement process formed the basis of this project. It identified gaps in guidance in the delivery of cantilever and gantry structures, as well as examples of good practice in their design and construction and lessons learnt from past failures.

This guidance document should exist read alongside relevant standards and is intended for use by all stakeholders involved in the delivery of cantilever and gantry structures including:

state road agencies
local government agencies
designers, contractors and fabricators.

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Summary
Definitions
Abbreviations
i. Introduction to the Guideline
- 1.1 Introduction
- 1.2 Purpose
- 1.iii Scope
  - i.3.ane Limitations
- 1.four Methodology
- ane.v Guideline Structure
2. Delivery Approach
- two.1 Design General Principles
- 2.2 Standards and Guidance Documents
- 2.three Matters for Resolution
3. Design
- 3.1 Design Life
- 3.2 Clearances
  - 3.2.1 Horizontal Clearance
  - three.two.ii Vertical Clearance
- 3.3 Deflection Limits
- 3.four Current of air Loading
  - 3.4.ane Terrain Category
  - 3.four.2 Solidity Ratio
  - 3.4.three Shielding Gene
  - 3.iv.4 Drag Coefficient
  - 3.4.5 Disquisitional Wind Loading for Wind-Induced Vibrations
  - three.4.6 Wind Loading for Fatigue
- iii.5 Dynamic Analysis
  - three.v.1 Dynamic Interaction Between a Span and an Attached Gantry
- 3.6 Fatigue
- 3.7 Detailing
  - 3.7.1 Connections
  - 3.7.ii Bolting
  - 3.seven.three Welding
  - three.7.4 Holes for Drainage and Electrical Conduits
  - 3.7.5 Useful References
- 3.8 Condom in Blueprint
  - three.8.one Responsibilities of the Design Engineer
  - iii.8.2 Other Responsibilities
  - 3.8.3 Safety in Design Workshop
  - 3.8.4 Useful References
iv. Construction
- 4.ane Protective Coatings
  - four.1.1 Considerations at the Blueprint Phase
  - 4.1.ii Considerations During Application
  - four.i.three Fabrication / installation/ storage considerations:
  - 4.1.four Common Issues Impacting Immovability and Part
  - 4.1.5 Useful References
- 4.2 Importation of Steel
  - 4.2.1 Steel Compliance
  - 4.2.2 High Forcefulness Bolt Compliance
  - iv.2.3 Availability and Lead Time
  - 4.2.4 Useful References
- four.3 Common Challenges
  - 4.three.1 Weld Baloney of Base / Splice Plates
  - 4.three.2 Distortion During Galvanisation
  - 4.3.three Connexion Constructability
  - iv.3.4 Tensioning of Bolts
  - iv.3.five Installation of Lock Nuts
  - 4.3.6 Gaps Between Splice Plates
  - 4.iii.7 Grouting Nether Base Plates
  - 4.3.8 Orientation and Installation of Ballast Bolts
  - four.3.9 Useful References
5. Quality
- 5.one Design Stage
- five.2 Construction Phase
References

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