Table Of Content

IRC:112-2020 CODE OF PRACTICE FOR CONCRETE ROAD BRIDGES (First Revision) Published by: INDIAN ROADS CONGRESS Kama Koti Marg, Sector-6, R.K. Puram, New Delhi-110 022 july, 2020 Price : ` 1500/- (Plus Packing & Postage) IRC:112-2020 First Published : November, 2011 Reprinted : December, 2012 Reprinted : J une, 2014 (Incorporating all Amendments/ Errata published in Indian Highways upto June, 2014) Reprinted : November, 2016 First Revision : J uly, 2020 (Incorporating all Amendments/ Errata published in Indian Highways upto June, 2020) (All Rights Reserved. No part of this publication shall be reproduced, translated or transmitted in any form or by any means without the permission of the Indian Roads Congress) Printed by India Offset Press, Delhi - 110 064 1100 Copies IRC:112-2020 SECTION 1 CONTENTS S.No. Description Page No. Section 1 Contents Personnel of the Bridges Specifications and Standards Committee i-ii Section 2 Introduction 1 Section 3 Definitions and Notations 3 3.1 Terms and Definitions 3 3.2 Notations 9 Section 4 General 14 4.1 Scope 14 4.2 Underlying Assumptions 14 Sections 5 Basis of Design 15 5.1 Aims of Design 15 5.2 Limit State Philosophy of Design 16 5.3 Limit States 16 5.4 Actions and their Combinations 18 5.5 Representative Values of Properties of Materials 19 5.6 Analytical Methods to Evaluate Behaviour of Structures 20 5.7 Design Based on Full Scale Testing 20 5.8 Durability Aspects 20 Section 6 Material Properties and their Design Values 22 6.1 General 22 6.2 Untensioned Steel Reinforcement 22 6.3 Prestressing Steel 25 6.4 Concrete 28 Section 7 Analysis 40 7.1 General Provisions 40 7.2 Analyses for Serviceability Limit States 42 7.3 Analyses for Ultimate Limit States 43 7.4 Torsional Effects 43 7.5 Combined Global and Local Effects 44 7.6 Structures and Structural Frames 44 IRC:112-2020 7.7 Composite Concrete Construction 46 7.8 Structural Effects of Time-Dependent Properties of Concrete 48 7.9 Prestressed Members and Structures 49 7.10 Design and Detailing for Curved Tendons in Thin Sections 52 7.11 Special Load Transferring Devices 54 Section 8 Ultimate Limit State of Linear Elements for Bending and Axial 55 Forces 8.1 Scope 55 8.2 Strain and Stress Distribution at Ultimate Limit State 55 8.3 Biaxial Bending 58 Section 9 Ultimate Limit State of Two and Three Dimensional Elements for 61 Out of Plane and in Plane Loading Effects 9.1 Scope 61 9.2 One-Way and Two-Way Slabs and Walls 61 9.3 Sub-elements of Box Structures 61 9.4 General Solution for Two-Way Slabs, Walls and Shell Elements 61 Section 10 Ultimate Limit State of Shear, Punching Shear and Torsion 64 10.1 Scope 64 10.2 Design of Flexural Members for Shear 64 10.3 Design Method 68 10.4 Design for Punching Shear 79 10.5 Torsion 85 Section 11 Ultimate Limit State of Induced Deformation 88 11.1 General 88 11.2 Simplified Criteria for Second Order Effects 89 11.3 Method of Analysis for Obtaining the Second Order Effects 92 11.4 Lateral Instability of Slender Beam 98 Section 12 Serviceability Limit State 100 12.1 General 100 12.2 Stress Limitation 100 12.3 Limit State of Cracking 101 12.4 Limit State of Deflection 108 Section 13 Prestressing Systems 110 13.1 General 110 IRC:112-2020 13.2 Anchorages for Post Tensioning Systems 110 13.3 Mechanical Couplers 111 13.4 Sheathing Ducts and Joints 111 13.5 Anchorage Block Design and Detailing 113 13.6 Protective Grouting 117 13.7 Protection of Post Tensioned Tendons and Anchorages 117 Section 14 Durability 118 14.1 General 118 14.2 Common Mechanisms Leading to the Deterioration of Concrete 118 Structures 14.3 Design for Durability 118 14.4 Additional Provisions for Specific Mechanisms of Deterioration 121 Section 15 Detailing: General Requirements 124 15.1 General 124 15.2 Reinforcing Steel 124 15.3 Prestressing Units 136 15.4 Coated Steels 141 Section 16 Detailing Requirements of Structural Members 142 16.1 General 142 16.2 Columns of Solid Section 142 16.3 R.C. Walls and Wall Type Piers 144 16.4 Hollow Piers/Columns 144 16.5 Beams 145 16.6 Solid Slabs 150 16.7 Corbels 154 16.8 Articulations 155 16.9 Deep Beams 155 16.10 Members with Unbonded Tendons 156 16.11 Concentrated Forces 156 16.12 Forces Associated with Change in Direction 158 16.13 Indirect Supports 158 16.14 Anchorage Zones for Post Tensioning Forces 159 Section 17 Ductile Detailing for Seismic Resistance 160 17.1 General 160 IRC:112-2020 17.2 Concrete Piers/Columns 160 17.3 Foundations 166 Section 18 Materials, Quality Control and Workmanship 168 18.1 General 168 18.2 Untensioned Steel 168 18.3 Prestressing Steel 170 18.4 Material Ingredients of Concrete 172 18.5 Mix Proportions of Concrete 175 18.6 Acceptance Criteria 179 18.7 Self-Compacting Concrete 180 18.8 Grouting 182 18.9 Quality Control and Workmanship 186 18.10 Design Consideration for Construction stage 195 Normative Annexures A-1 Actions, Design Situations and Combination of Actions 196 A-2 Additional Information and Data about Properites of Concrete and Steel 201 A-3 List of Standards and other Normative References 210 A-4 Structural Design by Working Loads / Allowable Stresses Method (Deleted) A-5 Test on Mild Steel and Corrugated HDPE Sheathing Ducts 214 A-6 Design Consideration for Construction Stages 222 A-7 State wise Average Annual Relative Humidity 225 Informative Annexures B-1 Concrete Shell Elements 231 B-2 Mechanisms of Deterioration of Concrete Structures 238 B-3 Effect of Live Loads on Deck Slabs 240 IRC:112-2020 PERSONNEl OF THE BRIDGES SPECIFICATIONS AND STANDARDS COMMITTEE (as on 6th December, 2019) 1. Pandey, I.K. Director General (Road Development) & Special Secretary to Govt. of India, (Convenor) Ministry of Road Transport and Highways, New Delhi 2. Balakrishna, Y Additional Director General, Ministry of Road Transport and Highways, (Co-convenor) New Delhi 3. Kumar, Sanjeev Chief Engineer (R), S,R&T, Ministry of Road Transport & Highways, Transport (Member-Secretary) Bhavan, New Delhi Members 4. Bagish, Dr. B.P. Chief Engineer (Retd.), Road Construction Department, Bihar 5. Banerjee, A.K. Member (Technical) (Retd.), National Highway Authority of India 6. Basa, Ashok Managing Director, CEM Consultant (P) Ltd. 7. Bhide, D.A. Vice President (Design), MRMPL 8. Bhowmick, Alok Managing Director, B&S Engineering Consultants Pvt. Ltd., UP 9. Chakrapani, R.V. Managing Director, Aarvee Associate, Hyderabad 10. Gairola, Col. Pradeep GM (Project), BRIDCUL, Dehradun 11. Garg, Sanjay Chief Engineer, Ministry of Road Transport and Highways, New Delhi 12. Ghoshal, A. Principal Advisor, STUP Consultants (P) Ltd. Kolkata 13. Gupta, Dr. Supratic Assistant Professor, IIT Delhi 14. Heggade, V.N. CEO, STUP Consultants Pvt. Ltd., Mumbai 15. HOD Bridge Division, CRRI (G.K. Sahu), CSIR-CRRI, New Delhi 16. Jaigopal, R.K. MD, Struct Geotech Research Laboratories (P) Ltd. Bengaluru 17. Jatkar, Mohan Advisor, Gammon India Ltd. 18 Kataria, Ranjan Executive Director (Technical), Delhi Metro 19. Koshi, Ninan DG(RD)&AS (Retd.), Ministry of Surface Transport, New Delhi 20. Maheshwari, Dr. B.K. Professor, IIT Roorkee 21. Managing Director, RSRDC (M.G. Maheshwari, MD) RSRDC, Jaipur 22. Managing Director, UPSBC (Ranjan Mittal, MD) UPSBC, Lucknow 23. Manisekar, Dr. R. Sr. Scientist, CSIR-SERC, Chennai, Tamil Nadu 24. Mishra, Dr. Sudhir Professor (CE), IIT Kanpur 25. Nirmal, S.K. Secretary General, IRC 26. Patankar, V.L Addl. Director General (Retd.), Ministry of Road Transport and Highways, New Delhi 27. Prasad, Mathura Superintending Engineer, PWD Delhi 28. Puri, S.K. DG(RD)&SS (Retd.), Ministry of Road Transport and Highways, New Delhi 29. Rao, P. Ravinder Engineer-in-Chief (R&B) State Roads, CRN, PPP & RDC, Telangana i IRC:112-2020 30. Director General, BRO (Anil Kumar, Chief Engineer) Border Road Organization 31. Sharan, G. DG(RD)&SS (Retd.), Ministry of Road Transport and Highways, New Delhi 32 Sharma, R.S. Managing Director, Sugam Technocrats Pvt. Lt., New Delhi 33. Sinha, B.K. Chief Engineer, Ministry of Road Transport and Highways, New Delhi 34. Sinha, N.K. DG(RD)&SS (Retd.), Ministry of Road Transport and Highways, New Delhi 35. Subbhiya, Ravindra Chief Design Engineer, L&T, Chennai 36. Tandon, Prof. Mahesh Managing Director, Tandon Consultants (P) Ltd., New Delhi 37. Tawade, D.O. Member (Technical) (Retd.), National Highway Authority of India (NHAI), New Delhi 38. The Engineer-in-Chief, MES Military Engineer Service (MES), New Delhi (Sharma AVSM, Lt. Gen. Suresh) 39. Viswanathan, T Consultant, Delhi Corresponding Members 1 Manjure, P.Y. Director, Freyssinet Prestressed Concrete Co. Ltd, Mumbai 2 Sinha, Prof. Ravi Professor, IIT Mumbai 3 Subbarao, Dr. Harshavardhan Chairman & Managing Director, Construma Consultancy (P) Ltd. Mumbai Ex-Officio Members 1 President, (Basar, Toli), Chief Engineer, PWD Arunachal Pradesh Indian Roads Congress 2 Director General (Road (Pandey, I.K.), Ministry of Road Transport and Highways, New Delhi Development) & Special Secretary to Govt. of India 3 Secretary General, Nirmal, Sanjay Kumar Indian Roads Congress ii