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1 TABLE OF CONTENTS REINFORCING steel . CHAPTER 7. FILE NO. TITLE DATE. TABLE OF CONTENTS AND INTRODUCTION. Table of Contents Chapter 7 .. 10 Mar2015. Introduction Chapter 7 .. 10 Mar2015. REINFORCING steel PROPERTIES. Physical 10 Mar2015. Area of Rebars Per Foot of Section .. 10 Mar2015. Reinforcing steel Schedule and Bending Diagram .. 10 Mar2015. LAPS AND DEVELOPMENT LENGTHS. Basic Development Lengths - Bars in Tension .. 10 Mar2015. Development Lengths - Bars in Tension .. 10 Mar2015. Development Lengths - Bars in Tension .. 10 Mar2015. Basic Development Lengths - Bars in 10 Mar2015. Development Lengths - Bars in Compression .. 10 Mar2015. Development Lengths - Standard Hooked Bars in Tension.

2 10 Mar2015. Lap Splices - Bars in Tension .. 10 Mar2015. Lap Splices - Bars in Tension Class A .. 10 Mar2015. Lap Splices - Bars in Tension Class B .. 10 Mar2015. Lap Splices - Bars in Tension Class C .. 10 Mar2015. Lap Splices - Bars in Compression .. 10 Mar2015. Modification Factors to Basic Development Lengths .. 10 Mar2015. Modification Factors to Basic Development Lengths .. 10 Mar2015. Welded Wire, Shear Reinforcement and Mechanical Devices .. 10 Mar2015. IDENTIFICATION. Marking System for Reinforcement in Bridges .. 10 Mar2015. Marking System for Reinforcement in Bridges .. 10 Mar2015. * Indicates 11 x 17 sheet; all others are 8 x 11. VOL. V - PART 2. REINFORCING steel DATE: 10 Mar2015.

3 TABLE OF CONTENTS CHAPTER 7 SHEET 1 of 1. FILE NO. INTRODUCTION. Chapter 7 of this manual establishes the practices and requirements regarding the use of reinforcing steel . Development lengths and lap splices in the tables provided in this chapter are intended to assist designer for design and detailing of concrete member. Development length and lap splices shall be determined in accordance with AASHTO LRFD 7th Edition. For concrete with a specified compressive strength greater than 10 ksi, the development length and lap splices shall be calculated in accordance with 2015 AASHTO LRFD 7th Edition Interim or later revisions. References to AASHTO LRFD specifications in the chapter refer to the current AASHTO LRFD.

4 Bridge Design Specifications and VDOT Modifications (IIM-S&B-80). Several major changes to past practices are as follows: 1. Revised and reorganized the entire Section based on AASHTO LRFD. 2. Removed content regarding epoxy-coated reinforcing steel as the VDOT. discontinued the use of the epoxy coated bars and galvanized bars. VOL. V - PART 2. REINFORCING steel DATE: 10 Mar2015. INTRODUCTION CHAPTER 7 SHEET 1 of 1. FILE NO. REINFORCING steel VOL. V - PART 2. DATE: 10 Mar2015. REINFORCING steel PROPERTIES SHEET 1 of 3. PHYSICAL PROPERTIES FILE NO. REINFORCING steel VOL. V - PART 2. DATE: 10 Mar2015. REINFORCING steel PROPERTIES SHEET 2 of 3. AREA OF REBARS PER FOOT OF SECTION FILE NO.

5 REINFORCING steel VOL. V - PART 2. DATE: 10 Mar2015. REINFORCING steel PROPERTIES SHEET 3 of 3. REINFORCING steel SCHEDULE AND BENDING DIAGRAM FILE NO. Basic Development Lengths - deformed Bars in Tension Basic Development Length ldb AASHTO Reinforcement fy = 60 ksi Concrete fc' = ksi ksi ksi ksi Bar Size Dia db Area Ab ldb ldb ldb ldb in in^2 in in in in 3 4 5 6 7 8 9 10 11 14 18 Notes: 1. The basic tension development length ldb in the table above is calculated based on AASHTO LRFD for normal concrete and uncoated straight deformed reinforcement yield strength fy = 60 ksi. 2. Tension development length ld shall be the product of the basic development length, ldb in the table and the modification factor or factors ( ) specified in File , but shall not be less than 12.

6 3. For design convenience, tables in File No. provide the tension development length ld = *ldb based on bar spacing, clear cover and top bars for uncoated deformed reinforcement in normal weight concrete. REINFORCING steel VOL. V - PART 2. DATE: 10 Mar2015. LAPS AND DEVELOPMENT LENGTHS SHEET 1 of 14. BASIC DEVELOPMENT LENGTHS - BARS IN TENSION FILE NO. Development Lengths - deformed Bars in Tension Center to Center Spacing < 6 or Clear Cover < 3 , Reinforcement fy = 60 ksi Development Length ld = *ldb '. Concrete fc = ksi fc' = ksi fc' = ksi fc' = ksi Bar Size Top Bars Others Top Bars Others Top Bars Others Top Bars Others 3 1'-1 1'-0 1'-1 1'-0 1'-1 1'-0 1'-1 1'-0 . 4 1'-5 1'-0 1'-5 1'-0 1'-5 1'-0 1'-5 1'-0.

7 5 1'-9 1'-3 1'-9 1'-3 1'-9 1'-3 1'-9 1'-3 . 6 2'-3 1'-8 2'-2 1'-6 2'-2 1'-6 2'-2 1'-6 . 7 3'-1 2'-2 2'-8 1'-11 2'-6 1'-9 2'-6 1'-9 . 8 4'-0 2'-11 3'-6 2'-6 3'-2 2'-3 2'-10 2'-1 . 9 5'-1 3'-8 4'-5 3'-2 3'-11 2'-10 3'-7 2'-7 . 10 6'-5 4'-7 5'-7 4'-0 5'-0 3'-7 4'-7 3'-3 . 11 7'-11 5'-8 6'-10 4'-11 6'-2 4'-5 5'-7 4'-0 . 14 10'-11 7'-10 9'-6 6'-9 8'-6 6'-1 7'-9 5'-7 . 18 14'-2 10'-2 12'-3 8'-9 11'-0 7'-10 10'-0 7'-2 . Center to Center Spacing 6 and Clear Cover 3 , Reinforcement fy = 60 ksi Development Length ld = *ldb Concrete fc' = ksi fc' = ksi fc' = ksi fc' = ksi Bar Size Top Bars Others Top Bars Others Top Bars Others Top Bars Others 3 1'-0 1'-0 1'-0 1'-0 1'-0 1'-0 1'-0 1'-0 . 4 1'-2 1'-0 1'-2 1'-0 1'-2 1'-0 1'-2 1'-0.

8 5 1'-5 1'-0 1'-5 1'-0 1'-5 1'-0 1'-5 1'-0 . 6 1'-10 1'-4 1'-9 1'-3 1'-9 1'-3 1'-9 1'-3 . 7 2'-6 1'-9 2'-2 1'-6 2'-0 1'-5 2'-0 1'-5 . 8 3'-3 2'-4 2'-10 2'-0 2'-6 1'-10 2'-4 1'-8 . 9 4'-1 2'-11 3'-6 2'-6 3'-2 2'-3 2'-11 2'-1 . 10 5'-2 3'-8 4'-6 3'-3 4'-0 2'-11 3'-8 2'-8 . 11 6'-4 4'-7 5'-6 3'-11 4'-11 3'-6 4'-6 3'-3 . 14 8'-9 6'-3 7'-7 5'-5 6'-10 4'-10 6'-3 4'-5 . 18 11'-4 8'-1 9'-10 7'-0 8'-10 6'-4 8'-0 5'-9 . REINFORCING steel VOL. V - PART 2. DATE: 10 Mar2015. LAPS AND DEVELOPMENT LENGTHS SHEET 2 of 14. DEVELOPMENT LENGTHS - BARS IN TENSION FILE NO. Development Lengths - deformed Bars in Tension (cont'd.). Notes: 1. Values for the development length ld in the tables are for normal weight concrete and reinforcement fy = 60 ksi and have been rounded up to the next highest inch.

9 2. Top bars are horizontal bars with more than 12 fresh concrete cast below the bars. 3. The development length shall not be less than 12 . 4. For bundled bars, development length ld shall be that for the individual bar increased by 20. percent for a three-bar bundle and by 33 percent for a four-bar bundle. 5. For modification factors, see File No. Development Length REINFORCING steel VOL. V - PART 2. DATE: 10 Mar2015. LAPS AND DEVELOPMENT LENGTHS SHEET 3 of 14. DEVELOPMENT LENGTHS BARS IN TENSION FILE NO. Basic Development Lengths - deformed Bars in Compression Reinforcement fy = 60 ksi Basic Development Length ldb AASHTO Concrete fc' = ksi ksi ksi ksi Bar Size Dia db Area Ab ldb ldb ldb ldb in in^2 in in in in 3 4 5 6 7 8 9 10 11 14 18 Notes: 1.

10 The basic compression development length ldb in the table is calculated based on AASHTO. LRFD for normal concrete and straight deformed reinforcement yield strength fy = 60 ksi. 2. The development length ld, for deformed bars in compression shall be the product of the basic development length ldb and applicable modification factors and shall not be less than 8 . 3. For design convenience, the development length ld is provided in File REINFORCING steel VOL. V - PART 2. DATE: 10 Mar2015. LAPS AND DEVELOPMENT LENGTHS SHEET 4 of 14. BASIC DEVELOPMENT LENGTHS - BARS IN COMPRESSION FILE NO. Development Lengths - deformed Bars in Compression Reinforcement fy = 60 ksi Development Length ld = modification factor(s) *ldb '.