Substructure Help

Auto Load Generation: Structure DL Screen

The Auto Load Generation: Structure DL screen is used for auto generation of dead loads. Select the appropriate check boxes to include or not include the dead load of slabs and girders as superstructure dead loads acting on the pier cap at the bearing point locations. Then, input the appropriate unit weights.

There are four options available to generate the composite dead loads:

  • Using Simple Span Distribution

    To generate the dead load using the simple span distribution for barriers and wearing surface, select the appropriate check boxes to include or not include the dead load. Then, enter the appropriate unit weights and load per foot.

  • Using Continuous Beam Model

    If you would like to compute dead loads of the superstructure considering the continuity of spans and supports, select this option.

  • Entering a Composite Reaction

    To generate the dead load by entering a total composite reaction, select this option and enter the value of the composite dead load reaction. This option may be used for bridges which are either continuous over the pier and a DL reaction from superstructure is already computed. For multiple column pier or hammerhead pier, only vertical reaction is to be specified. However, for integral pier, vertical reaction and an associated moment may be specified.

  • Importing the Composite Dead Load Reaction

    This option appears differently depending upon currently selected Pier Type. When selected pier type is not integral, this option allows to import reactions from Precast/Prestressed Girder. When the selected pier is integral, this option allows importing Precast/Prestressed Girder reactions.

    When the dialog for dead load is opened with flared bridge, the only option available is to import the reactions from Precast/Prestressed Girder. All other options are disabled including the check boxes for slab and girder weight. That will be imported from Precast/Prestressed Girder as well.

    Using this option you can import Precast/Prestressed Girder or CIP RC/PT Girder computed support reactions into the program. However, you will first need to export the results from Precast/Prestressed Girder/CIP RC/PT Girder using File: Export to Substructure. For a non-integral pier, select this option and click Import to open the Import Load Reactions from Precast/Prestressed Girder screen. For importing reaction from CIP RC/PT Girder, see Import Load Reactions from CIP RC/PT Girder screen.