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PGSuper
4.1
Precast-prestressed Girder Bridges
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PGSuper
4.1
Precast-prestressed Girder Bridges
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Define the general layout of the bridge.
| Item | Description |
|---|---|
| Bridge Line Offset | Enter the offset from the alignment to the bridge line. |
| Girder Family | Select a general type of girder from the drop down list |
| Girder Type | Select a specific type of girder. Check the box below the list if this girder type is to be used for the entire bridge. |
| Number of Girders | Use the up/down arrows to select the number of girders. Check the box below if this number of girders is to be used in all spans. |
| Spacing Type | Select the spacing type to be used |
| Girder Spacing | Enter the girder spacing, locate the girders transversely, and select the measurement datum. See Bridge Modeling in the User Guide and Girder Spacing in the Technical Guide for additional details. |
| Joint Spacing | Enter the joint width between adjacent girders, locate the girders transversly, and select the measurement datum. See Bridge Modeling in the User Guide and Girder Spacing in the Technical Guide for additional details. |
| Top Width | Select a top width type and enter the top width dimensions. Top width types are Symmetric (the top flange is symmetric about the centerline of the girder), Centered CG (the length of the top flange on the left and right side of the girder centerline are automatically computed such that the center of gravity of the girder is coincident with the girder centerline), and Asymmetric (the top flange is asymmetric and defined by unique left and right overhangs measured from the girder centerline). |
| Girder Connectivity | For adjacent girders, select the transverse connectivity. The girder connectivity influences the live load distribution factor calculations. |
| Girder Orientation | Select the girder orientation. Some girders are not aligned with their webs plumb. Girders can be oriented such that their top flanges parallel the roadway surface |
| Deck Type | Select the type of deck to be used |
A description of the bridge, along with the assumed cross section type for live load distribution factor calculations, is given.
The Bridge Line is an arbitrary line that parallels the alignment. This line can represent anything, though it is most commonly used for the centerline of the bridge. Many of the bridge geometry parameters, such as transverse location of girders and the edge of deck, can be located by an offset from the Alignment or the Bridge Line.
The list of deck types depends of the girder family and spacing type.
| Deck Type | Description |
|---|---|
| Composite Cast-In-Place Deck | The deck is a composite, cast in place concrete deck. The plan view deck geometry is defined by a sequence of station and offset parameters on the Deck Geometry and Materials tab. |
| Composite Stay-In-Place Deck Panels | The deck is constructed of partial depth stay in place concrete deck panels and a cast in place topping. This deck system is composite with the girder. The plan view deck geometry is defined by a sequence of station and offset parameters on the Deck Geometry and Materials tab. |
| Composite Cast-In-Place Overlay | This deck type is a composite, cast in place concrete deck used with adjacent girders. The plan view deck geometry is defined by the overall perimeter of the girders. |
| Nonstructural Overlay | This deck type is a cast in place concrete overlay used with adjacent girders. The plan view deck geometry is defined by the overall perimeter of the girders. This deck type serves as a wearing surface and contributes dead load to the structure, however it is nonstructural so it does not contribute to the capacity of the structure. |
| No Deck | Use this option when roadway surface is integral with the girder elements. Examples of this include adjacent voided slabs, box beams, and deck bulb tee girders. |
The general layout of the bridge defined in this window is for a simple, uniform bridge with the same type of girder in all spans and the same girder spacing in all spans. More complex bridges can be defined. Each girder can be a different type, though all girders must be in the same family. That is, for example, you can use several different types of slab girders in a span, but you cannot mix slab girders with other girder types. Each span can also have a unique number of girders and unique girder spacing. See the following for additional information:
1.8.16