Design Manual for Roads and Bridges Highway Structures & Bridges Inspection & Assessment CS 467 Risk management and structural assessment of concrete deck hinge structures (formerly BA 93/09) Revision 1 Summary The use of this document enables the safety and serviceability of concrete hinge deck structures to be assessed and managed, allowing to manage risks and maintain a safe and operational network. Application by Overseeing Organisations Any specific requirements for Overseeing Organisations alternative or supplementary to those given in this document are given in National Application Annexes to this document. Feedback and Enquiries Users of this document are encouraged to raise any enquiries and/or provide feedback on the content and usage of this document to the dedicated Highways England team. The email address for all enquiries and feedback is: [email protected] This is a controlled document. CS 467 Revision 1 Contents Contents Release notes 3 Foreword 4 Publishing information . 4 Contractual and legal considerations . 4 Introduction 5 Background . 5 Assumptions made in the preparation of this document . 5 Abbreviations and symbols 6 Terms and definitions 7 1. Scope 8 Aspects covered . 8 Implementation . 8 Use of GG 101 . 8 2. Risk management process and prioritisation 9 Risk management report . 11 Initial review . 11 Risk assessment for structural assessment . 11 Structural review . 12 Structural assessment . 12 Risk assessment for management . 12 Management plan . 12 Prioritisation of deck hinge structures . 12 3. Initial review 13 4. Risk assessment for structural assessment 14 Risk assessment . 14 Primary risks . 14 Condition risk . 15 Structural risk . 15 Secondary risks . 15 Consequential risk . 16 Vulnerable details risk . 16 Other risks . 16 5. Structural review 17 6. Structural assessment 18 Assessment processes and basis of assessment . 18 Limit States . 18 Assessment actions and assessment action effects . 18 Assessment of resistance . 18 Verification . 18 Methodology for structural analysis of the hinge . 18 Assessment based on strut-and-tie analysis . 19 Allowance for Faulty Construction . 20 Allowance for Deterioration . 21 Fatigue Assessment . 21 1 CS 467 Revision 1 Contents 7. Risk assessment for management 22 Primary risks . 22 Condition risk . 22 Structural risk . 22 Secondary risks . 22 8. Management plan 23 Structures assessed to have sufficient capacity . 23 Structures assessed to have sufficient capacity but with concerns . 23 Sub-standard structures . 24 Management measures . 24 Maintenance inspections . 24 Maintenance activities . 25 Monitoring . 25 Plan for interim measures . 25 Long term solutions . 25 Interim measures . 25 Investigations . 25 Repair . 26 Strengthening . 26 Replacement . 27 9. Normative references 28 10. Informative references 29 Appendix A. Model documents 30 A1 Model risk management report . 30 A2 Model priority list . 31 Appendix B. Guidance on risk assessment 33 B1 General . 33 B2 Primary risk rating . 33 B2.1 Condition risk . 33 B2.2 Structural risk . 37 B3 Secondary risks . 39 B3.1 Consequential risk . 39 B3.2 Vulnerable details risk . 44 B3.3 Other risks . 44 Appendix C. Fatigue assessment 46 C1 Fatigue endurance of reinforcing bars . 46 C2 Local stress in scissor bar . 46 2 CS 467 Revision 1 Release notes Release notes Version Date Details of amendments 1 Apr 2020 Revision 1 (April 2020) This revision is for minor amendments to the England NAA only. Please see the England NAA revision release notes for details. Revision 0 (March 2020) CS 467 document replaces BA 93/09. This full document has been re-written to make it compliant with the new Highways England drafting rules. This document contains updated content on the risk management of bridges with deck hinges and their structural assessment, highlighting requirements and advice for a risk management plan and clarifying the risk assessment methodologies, to fully align with the other associated DMRB documents, still retaining compatibility with the stages of the current management strategy and the existing requirements for structural assessment of deck hinge structures. 3 CS 467 Revision 1 Foreword Foreword Publishing information This document is published by Highways England . This document supersedes BA 93/09, which is withdrawn. Contractual and legal considerations This document forms part of the works specification. It does not purport to include all the necessary provisions of a contract. Users are responsible for applying all appropriate documents applicable to their contract. 4 CS 467 Revision 1 Introduction Introduction Background The use of this document enables the safety and serviceability of deck hinges to be managed and assessed, providing key information that is required to manage risks and maintain a safe and operational network. This document has been developed to replace BA 93/09. The approach for risk management of deck hinge structures has been developed based on.