Structures Design Guidelines | Jan 2007
7 - Widening and Rehabilitation |

# Chapter 7 - Widening and Rehabilitation

## 7.1 General

### 7.1.1 Load Rating (07/06) July 2006 - Revised entire section per TDB C06-01. Jan 2005 - Revised entire section per TDB C05-01. Revised strength or service limit to less than 1.0 for the FL120 Permit Vehicle.

A. Before preparing widening or rehabilitation plans, review the inspection report and perform a load rating in accordance with SDG 1.7
. If the LRFR Design Inventory load rating (Strength or Service) is less than 1.0, use LRFR Appendix D.6 to determine the LFD rating factors for the existing bridge. If any rating for design vehicles is below 1.0, replacement or strengthening is preferred.

B. If the rehabilitation or strengthening of a bridge does not produce a LRFR inventory rating greater than or equal to 1.0, calculate and report the appropriate rating factors using LRFR Appendix D.6 and a Variance or Exception is required. Design all bridge widening or rehabilitation projects in accordance with SDG 7.3
.

Commentary: The State Maintenance Office should be contacted by the District regarding any calculated operating ratings for existing bridges Service or Strength, less than 1.0 for the FL-120 Permit Vehicle on any state road to assure appropriate permitting operations.

### 7.1.2 Bridge Deck - See Chapter 4.

### 7.1.3 Expansion Joints - See Chapter 6
.

### 7.1.4 Traffic Railing - See Chapter 6
.