Thank you HotRod10 for the reply and the information. I was following the guidance provided in the FHWA Publication No. FHWA-NHI-15-058 Link. In Design Step 5.6.7.1 it calculates final camber and then states, "This camber is used to determine bridge seat elevations." If I was going to include...
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 am in the process of obtaining the most recent inspection reports which should indicate if the structure has any section loss and what the extent of that loss is if any. Thanks!
PT99 & bridgebuster thank you for the information. I actually calculated out the 0.55*Fy = 19.8 ksi and was hesitant to make the assumption that this was the 20,000 psi I was seeing. Thanks!
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...
Thank you for the very helpful response. I agree that my headwall, which we also refer to as a foreslope wall, will just be a soil erosion stop. It will be a separate pour after the culvert is placed. Since it really doesn't take any load, is it acceptable to just provide temperature and...
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...
