Structures Design Guidelines | Jan 2009
5 - Superstructure - Steel |

# 5 - Superstructure - Steel

## 5.1 General (01/09) 2009 Jan:Added 5.1.4 Deck Slabs. 2008 Jan: 5.1.B added reference to Guidelines for Design Details. 2007 July: Per TDB C07-06, A- revised to reflect adoption of LRFD 4th edition for both straight and curved bridges. Deleted B and C. 2006 July: Revised per TDB C06-04.Per TDB C05-15, revised 5.1 A.,B., and C. Per TDB C04-04, added 5.1.1 Corrosion Prevention. Added 5.1.D (Constructability Reference).

A. Design straight and curved steel bridge components in accordance with LRFD and the requirements of this chapter. (See SDG I.6 References
for LRFD edition.)

B. Refer to AASHTO/NSBA Steel Collaboration Documents G12.1 Guidelines for Design for Constructability and G1.4 Guidelines for Design Details. http://www.steelbridges.org/

### 5.1.1 Corrosion Prevention

A. To reduce corrosion potential, consider special details that minimize the retention of water and debris.

B. Consider special coatings developed to provide extra protection in harsh environments.

C. Consider the corrosion potential of box structures versus plate girders. Box Girders are preferred compared to plate girders when located in extremely aggressive environments.

D. See the Plans Preparation Manual 2.10.1 for minimum vertical clearances.

### 5.1.2 Girder Transportation

Coordinate the transportation of heavy and/or long girders with the Department’s Permit Office during the design phase of the project.

### 5.1.3 Dapped Girder Ends (07/06) 2006 July - Added section prohibiting dapped girder ends.

Dapped steel box girders or dapped steel plate girders are not permitted.

### 5.1.4 Deck Slabs - See SDG 4.2
for deck slab requirements.