high stress at slab continuity

[yaroosh]

Hello, I am working on a precast bridge where there is continuity provided across the slab. I am checking the stress at top of the slab as part of service limit check. I noticed at the supports I am exceeding the 0.19sqrtf'c. I have been thinking of possible solutions such as jacking the prestress at both ends of the beam so it might lower the demand on the slab. However I wonder if any one experienced something like it before on how to address stresses exceeding the tensile limit at the supports.

 

[STrctPono]

yaroosh, there are a couple of key details that you are leaving out of your explanation. Are the tendons continuous across the supports? I.E. is this a segmental or CIP post tensioned superstructure? If this is simply a pretensioned girder bridge with continuity provided by mild reinforcing over the supports then you do not need to satisfy the 0.19sqrtf'c requirement since this area of your bridge would not be considered a precompressed tensile zone.