Kansas DOT

This PGSuper configuration is hosted at PGSuper.com and implements beam shapes and LRFD settings used by the Kansas Department of Transporation (KDOT).

Note that this configuration requires PGSuper 2.4.2 or later.

Implemented Girder Shapes

• Several variations of KDOT Type K3 and K4 I-Beams for harped strand and straight/debonded configurations

Assumptions and Limitations

• Based on 2010 AASHTO Bridge Design Specifications with variations as follows:
• KDOT type K3 and K4 precast I beams only
• Strand slope check is disabled
• Harped strand hold down check is disabled
• Upper limit of 0.2 ksi for concrete tensile stress at release disabled
• Upper limit of 0.2 ksi for concrete tensile stress for lifting disabled
• Maximum stirrup spacing set to 18"
• Railing load is distributed evenly across all girders
• Final tensile stress for Service III set to 0.0948 * sqrt(f'ci) for all exposure conditions
• Horizontal interface shear stress at girder/deck interface is computed using the classic shear flow formula
• For losses, time from stressing to prestress transfer set to 18 hours
• No acceleration for steam or radiant heat curing
• Approximate lump sum per LRFD 5.9.5.3 is selected for the loss computation method
• Checking and automated design for lifting and hauling is disabled. KDOT uses an alternative method based on the 1987 PCI Design Handbook. Use MathCAD sheet at KDOT web site for calc's.
• The design algorithm will not reach an optimal concrete strength for the K4-"Straight" beams. This is because the upper straight strands are modeled using the harping sequence which disallows the algorithm from attempting to debond the lower strands. (That said, this is the best known method for placing upper straight strands in PGSuper). A recommended design approach is to first use the Girder Designer to find the overall strand layout and then reduce concrete strength by debonding lower strands manually.
• Rating criteria has not yet been input. Users needing to perform rating analysis must input parameters manually in order to perform rating analyses. Feedback on recommended rating parameters is appreciated. 

Quality Rating:DRAFT

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PGSuper Set Up Instructions

This configuration is hosted at PGSuper.com. Refer to this tutorial for detailed set up instructions.

References

• Kansas DOT State Bridge Office Home Page. The KDOT Bridge Design Manual, standard plan sheets and other useful information are available via links from this page.
• AASHTO LRFD Bridge Design Specifications,1998-present
• PCI Bridge Manual, Appendix B, AASHTO/PCI Bridge Products
  

Revision History

• February 21, 2011 - Initial Release

Developer

• BridgeSight Staff
• Special thanks to Jeff Ruby at KDOT for his help in the development of these libraries.

Disclaimer

IN NO EVENT WILL WE BE LIABLE TO YOU FOR ANY DAMAGES, INCLUDING ANY LOST PROFITS, LOST SAVINGS, OR OTHER INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING FROM THE USE OR THE INABILITY TO USE THE SOFTWARE (EVEN IF WE OR AN AUTHORIZED DEALER OR DISTRIBUTOR HAS BEEN ADVISED OF THE POSSIBILITY OF THESE DAMAGES, OR FOR ANY CLAIM BY ANY OTHER PARTY.

SOME STATES DO NOT ALLOW THE LIMITATION OR EXCLUSION OF LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.