PGSplice
3.0
Precast-prestressed Spliced Girder Bridges
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The dimensions of diaphragms at abutments and pier can be entered explicitly or the keyword "Compute" can be used to indicate that the height and width of the diaphragm be computed using the bridge geometry. This topic illustrates how the diaphragm dimensions are computed.
The height of the diaphragm is computed as:
Hdia = Hg + "A" + Hgo - tslab
The width of the diaphragm depends on the connection type at the pier.
Roller or hinge boundary condition
Wdia = Width of support.
Wdia = Back Side Bearing Offset - Back Side Support Width/2 + Ahead Side Bearing Offset - Ahead Side Support Width/2
Wdia = Back Side Bearing Offset + Back Side Support Width/2 + Ahead Side Bearing Offset + Ahead Side Support Width/2
If a physical pier model is used, Wdia is the greater of the value computed with the above equation and Wlower.