Deck Overhang Loads

Deck Overhang Loads can be optionally added by the user in the Deck Placement Sequence command. These loads include:

Deck Overhang
Construction
Finishing machine

Each load type is entered separately because different dead load factors are applied to each.

The following Assumptions are used:

The overhang bracket ties into the top/bottom of web as shown in Figure 2
All bracket loads are uniform except for the finishing machine
½ of the deck weight and construction load is on the exterior girder and ½ of the deck weight and construction load is on the bracket
For grillage analysis the equations in Article C6.10.3.4 are used to estimate the maximum flange lateral bending moments in the flanges due to the lateral bracket forces
- Moment due to a statically equivalent uniformly distributed lateral bracket force:
- Moment due to a statically equivalent concentrated lateral bracket force assumed placed at the middle of the unbraced length:
Flanges are continuous with adjacent unbraced lengths

The user computes and enters F into the Deck Placement Dialog where F represents the following:

For deck placement loads F is in k/ft = deck_load * tan(alpha)
For construction loads F is in k/ft = const_load * tan(alpha)
For finishing machine or other equipment loads F is in k = finish_machine * tan(alpha)

As described above, LEAP Bridge Steel will compute the lateral bending moments on the exterior girder flanges and use those to compute the lateral bending stresses (Article 6.10.1.6) that are used in local and lateral torsional buckling code checks. Flange lateral bending stresses that result from deck overhang analysis are combined with flange lateral bending stresses that result from cross frame analysis.