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RE: Design of knee braced steel frame for support of a crane on a trolley

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I would treat it as a K brace per section 2213.8.4.2 along with the
requirements for Nonconcentric brace per 2213.8.4.3.

	-----Original Message-----
	From:	Khosrownia, Ghassem SPK
[SMTP:GKhosrownia(--nospam--at)spk.usace.army.mil]
	Sent:	Friday, December 03, 1999 3:01 PM
	To:	'seaint(--nospam--at)seaint.org'
	Subject:	RE: Design of knee braced steel frame for support of
a crane on a trolley

	Ben, what if it was a building, then what would the UBC require?
Would
	moment frame be close enough?

	-----Original Message-----
	From: Yousefi, Ben [mailto:Ben.Yousefi(--nospam--at)ci.sj.ca.us]
	Sent: Friday, December 03, 1999 2:57 PM
	To: 'seaint(--nospam--at)seaint.org'
	Subject: RE: Design of knee braced steel frame for support of a
crane on
	a trolley


	You're on the right track. Section 2213.8.6 allows the use of table
16-p for
	non-building structures. Since your frame falls into the category of
all
	other structures, R=2.9 should be appropriate. And you need only
comply with
	requirements of 2213.8.3.

	Ben Yousefi, SE
	San Jose, CA

		-----Original Message-----
		From:	Simon Solorio [SMTP:simon(--nospam--at)solorio.com]
		Sent:	Friday, December 03, 1999 12:34 PM
		To:	seaint(--nospam--at)seaint.org
		Subject:	Design of knee braced steel frame for
support of a
	crane on a trolley

		I'm design knee braced frames for support of a crane on a
trolley.
		The size in plan view is 48' x 24' with for columns at each
corner
	with
		steel beams connecting the columns at the top.
		I need some feed back on what the "R" value is for a knee
braced
	steel
		frame. (UBC 1997, seismic zone 4)

		I'm considering the structure a nonbuilding structure (UBC
section
	1634), so
		would the "R" value be 2.9 per table 16-P?

		thanks in advance for any comments.

		Simon Solorio, PE