dabbler101
Structural
- Sep 21, 2005
- 8
Hello all,
I am currently working on some preliminary design calculations for a bridge in Lee, MA that spans over the Housatonic River. The design span is 100', and the cross section is composed of (6) 48" deep spread box beams. Unfortunately, due to several site constraints, the bottoms of all six beams are below the ten year design flood elevation.
Sec. 3.18.1.1.2 of the AASHTO Standard Specifications for Highway Bridges states:
"In cases where the corresponding top of water elevation is above the low beam elevation, stream flow loading on the superstructure shall be investigated. The stream flow pressure action on the superstructure may be taken as Pmax with a uniform distribution"
My question is do I solely need to investigate the stream flow loading on the fascia beam, or do I need to look at stream flow loading on all beams below the design flood elevation?
Any help with this would be greatly appreciated.
Regards,
Jim
I am currently working on some preliminary design calculations for a bridge in Lee, MA that spans over the Housatonic River. The design span is 100', and the cross section is composed of (6) 48" deep spread box beams. Unfortunately, due to several site constraints, the bottoms of all six beams are below the ten year design flood elevation.
Sec. 3.18.1.1.2 of the AASHTO Standard Specifications for Highway Bridges states:
"In cases where the corresponding top of water elevation is above the low beam elevation, stream flow loading on the superstructure shall be investigated. The stream flow pressure action on the superstructure may be taken as Pmax with a uniform distribution"
My question is do I solely need to investigate the stream flow loading on the fascia beam, or do I need to look at stream flow loading on all beams below the design flood elevation?
Any help with this would be greatly appreciated.
Regards,
Jim