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Re: Runway beam[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Runway beam
- From: Roger Turk <73527.1356(--nospam--at)compuserve.com>
- Date: Sun, 7 Feb 1999 14:08:29 -0500
What about a vertical miter? Long span bridges have used finger joints to accommodate very large expansions --- I think up to *6 feet* on the Verazanno Narrows bridge --- but this would be impractical on a runway beam. With a vertical miter, you would not have a gap problem, nor would you have a thin section problem. A. Roger Turk, P.E.(Structural) Tucson, Arizona Stan Mulder wrote: . > ...the trolley wheel needs to be continuously supported. The small wheels . > (~5 to 6 ins diameter) also cannot move over gaps larger than about 1/8 . > ins otherwise the gap interferes with the with the movement. The flanges . > also need to be perfectly level at joints. Mitring the flange tends to . > weaken the flange in cross bending because the wheels are close to the . > edges of the flange, with a impact load applied at the tip of the taper. . >
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