ML20138M290

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Informs That Derivation of Unbraced Length Provisions in American Inst of Steel Const Book Re Steel Structures Does Not Apply to Single Angles in Bending,Per 840227 Telcon
ML20138M290
Person / Time
Site: LaSalle Constellation icon.png
Issue date: 02/27/1985
From: Galambos T
MINNESOTA, UNIV. OF, MINNEAPOLIS, MN
To: Hartzman M
NRC
Shared Package
ML20138M288 List:
References
NUDOCS 8511010063
Download: ML20138M290 (3)


Text

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UNIVERSITY OF MINNESOTA Department of Civil and Mineral Engineenng 1 TWIN CITIES 122 Civil and Mineral Engineenng Building 500 Pillsbury Onve S.E.

Minneapohs. Minnesota 55455-0220 (612) 373-2968 3 R - M I9 February 27,1985 Dr. M. Hartzman U.S. Nuclear Regulatory Commission Mail Stop No. P522 Washington, D.C. 20555

Dear Dr. Hartzman,

This is a follow up letter to our phone conversation on the afternoon of Feb.27,1984. The derivation for the unbraced length provisions in the AISC Sec.1.5.1.4.1.5 and 1.5.1.4.5.2.b are given in detail on p. 456,457 and 469 of the book

  • Steel Structures" by G.C. Ssimon and J.E. Johnson (Second Edition, Harper and Row,1980). The derivation follows the work of White, Lay',' E.ee and
  • Galambos which was performed at Lehigh from about 1955 to 1965. This work only applies to plastic bending of wide-flange shapes to provide bracing to the compression flange so that the plastic moment can be attained. The limitation 76 bg / /F in AISC Sec. 1.5.1.4.5.2.b thus does not apply to single angles in bending? The basic allowable stress required is 0.6 F .

y Sincerely yours, f& A =&

T.V. Galambos Professor of Civil Engineering TVG:pab cc: Mr. Kenneth T. Kostal Assistant Manager, Structural Department Sargent and Lundy, Engineers 55 East Monroe St.

Chicago, Ill. 60603 8511010063 851022 PDR ADOCK 05000373 P PDR

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