Florida DOT

Beam shapes and LRFD configuration for Florida DOT

PGSuper Professional Only

This PGSuper configuration is included with PGSuper Professional and implements beam shapes and LRFD settings as per the Florida DOT STRUCTURES DESIGN
GUIDELINES, January 2018

Implemented Girder Shapes

  • Florida I Beam (FIB) (all shapes)
  • Florida U Beam (FUB) (all shapes)
FIB Beams

Florida I Beams
FUB Beams

Florida U Beams

Assumptions and Limitations

  • Florida Structure Design Guidelines, January 2018
  • Based on AASHTO LRFD Bridge Design Specifications, 8th Edition, 2017
  • Stress and camber calculations for the design of simple span, pretensioned components based upon the use of transformed section properties.
  • Prestress losses are computed using LRFD [5.9.3.3], Approximate Estimate of Time-Dependent Losses. Users must modify the loss method directly for any structures not using this method.
  • A load factor of 0.8 is used for live load in the Service III limit state
  • Railing load is distributed to 3 nearest girders
  • Max Pjack force before debonding not checked from “Index 20010 Series Prestressed Florida-I Beams (Rev. 01/16)”
  • Live Load Distribution Factors [2.9] AASHTO standard methods are used. Florida range of applicability modifications are ignored.
  • Limits for partially debonded strands set to 30% of all strands
  • PGSuper is not able to directly design the “dormant” top strands. However, the FIB library sections utilize two adjustable straight strands located a the top of the girder. These strands will be jacked at 0.75*fpu, which gives a prestressing force close to that of the four partially jacked “dormant” strands. The jacking force for this group can then be modified manually to the jacking force desired by the engineer.
  • From SDG 4.3.1.C: “When analyzing stresses of simple span beams, limit stresses in accordance with LRFD [Table 5.9.4.1.2-1] with the exception that for the outer 15 percent of the design span of straight longitudinal beams, tensile stress at the top of beam at release may be taken as 0.24 * sqrt(f’ci)”. PGSuper assumes that the beam will be detailed with adequate longitudinal rebar to achieve the higher stress limit per LRFD 5.9.4.1.2. Therefore a limit value of 0.24 * sqrt(f’ci) is applied to the entire beam.
  • Splitting Reinforcement Requirements [SDG 4.3.1.D] are not implemented.
  • 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. 
  • Checking and automated design for lifting and hauling is disabled.
  • Strand slope check is disabled
  • Harped strand hold down check is disabled

PGSuper Set Up Instructions

This configuration is included in PGSuper Professional and its use is restricted to licensed users only. PGSuper Professional users can access the configuration as follows:

  • Open PGSuper Professional
  • Click File | Configure PGSuper
  • Select the PGSuper Professional sever
  • Select the Florida DOT library

References

Revision History

  • October 11, 2018 - Initial Release

Developer

  • BridgeSight Staff

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.