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Re: Long Span Bridge - Any Thoughts Out There in SEAINT World

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Title: RE: Long Span Bridge - Any Thoughts Out There in SEAINT World
This is similar to what constitutes a "deep" foundation and there IS a deep foundation Foundation !  IMO a long span bridge is one that uses more than one structural system to support/augment it.  The Golden Gate is one that uses vierandiel (spell) trusses and suspension cables.  The spans on it are much greater than the typical highway department or interstate bridge.
 
You can have the same Pratt truss bridge with three spans that crosses a river 300 yards wide as the one with three spans that cross a river 900 yards wide.  The only real difference is in their relative member sizes and their total (truss and orthotropic deck) moments of inertia.  So a long span would be a structure that exceeds this (IMO).
 
Greg
-----Original Message-----
From: Paul Meyer <PMeyer(--nospam--at)HASimons.com>
To: 'seaint(--nospam--at)seaint.org' <seaint(--nospam--at)seaint.org>
Date: Thursday, September 16, 1999 3:25 PM
Subject: RE: Long Span Bridge - Any Thoughts Out There in SEAINT World

Don't have source for this other than intuition, but I would split the world of bridges into three parts:

Short span:  Less than one truck length
Medium span: 1-2 truck lengths
Long Span:  More than two truck lengths.

Truck length being the longest truck allowed in the particular jurisdiction.

-----Original Message-----
From: Rogers, Robert [mailto:Robert.Rogers(--nospam--at)Woolpert.com]
Sent: Thursday, September 16, 1999 07:59
To: 'seaint(--nospam--at)seaint.org'
Subject: Long Span Bridge - Any Thoughts Out There in SEAINT World


Talk about a silent world ......