How is the camber for a prestressed concrete beam accounted for in the bridge beam seat? Is it the mid-span camber that is used to make the beam seat adjustment? If my final camber is an upward deflection, do I raise the beam seat to make up for the camber or lower it? I am thoroughly confused...
I am looking for some direction on checking the fatigue for a 3-span slab bridge (40ft-50ft-40ft) that needs to be designed following the AASHTO Standard Spec since it is part of a rehab of an existing bridge. In Section 8.16.8.3 it gives the formula for the fatigue stress range that is not to...
I need to analyze an existing girder to determine if it can support an additional load my client wants to be placed on it in the form of a new larger concrete barrier wall. My existing plans are from 1971 and the bridge inventory says the bridge was built in 1973. The design data from the...
The current AASHTO Bridge Design Spec. defines dv, effective shear depth, as the distance between the resultants of the tensile and compressive forces due to flexure. The commentary says this can be determined as dv=Mn(As*fy+Aps*Aps). For a non-prestressed rectangular section with no...
I need to design a headwall/foreslope wall & footing with a cutoff wall for a reinforced concrete box culvert using LRFD. Is there any design guidance available for this? The earth will be 6" deep at the back of the headwall and rise at a 2:1 slope. I plan to use dowel bars to connect the...
