Bayou
Civil/Environmental
- Jan 7, 2002
- 88
I have a question on the modeling of parallel bridges in HEC-2. This is a standard boulevard set of two lane bridges. Each 200-foot, 3-span bridge is 35 feet across, seperated by 30 feet. The low chords are above the 100-year by 2 feet. However the floodplain is about 1500 feet wide.
What is the appropiate method of modeling?
The options I've come up with involve:
1) modeling the bridges as one 70 foot bridge using normal bridge, but this doesn't give a true representation of the
ineffective flow area at the true faces.
2) modeling the bridges as two decks with normal bridge, but does upset the program with that little of expansion
space
3) modeling with special bridge as one long bridge, but
the wsel doesn't hit the low chord
Any suggestions would be helpful.
What is the appropiate method of modeling?
The options I've come up with involve:
1) modeling the bridges as one 70 foot bridge using normal bridge, but this doesn't give a true representation of the
ineffective flow area at the true faces.
2) modeling the bridges as two decks with normal bridge, but does upset the program with that little of expansion
space
3) modeling with special bridge as one long bridge, but
the wsel doesn't hit the low chord
Any suggestions would be helpful.