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Re: bridge uplift[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: bridge uplift
- From: "Robert Kazanjy" <rkazanjy(--nospam--at)gmail.com>
- Date: Tue, 13 Feb 2007 15:42:12 -0800
Having interacted with CalTrans bridge folks for number of years but I've never done any bridge design
that said, my associates who are "structures types" but do building not bridges
say "those bridge guys really look at things differently"
One thing I did learn is that the CaTrans folks talk in "bridge directions"
Longitudinal is the direction of the span & transverse is ......well transverse to the longitudinal direction
I would agree with your assessment of
......collect 20 PSF from the entire bridge width and apply it at a point 0.25*(bridge width) as a linear upward force....
Bridge with including traffic deck & sidewalk
Do you have a contact in design group in Sacto? They could
I am struggling with the Caltrans BDS wording regarding the wind uplift:
"3.15.3 Overturning Forces
…an upward force shall be applied at the windward quarter point of the transverse superstructure width. This force shall be 20 pounds per square foot of deck and sidewalk plan area…"
What is this "transverse superstructure" and where is the quarter point of its width? For example, am I supposed to collect 20 PSF from the entire bridge width and apply it at a point 0.25*(bridge width) as a linear upward force?
V. Steve Gordin, SE
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