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ANSI/AISC 360-05
An American National Standard

Specification
for Structural Steel Buildings
March 9, 2005

Supersedes the Load and Resistance Factor Design Specification for Structural Steel
Buildings dated December 27, 1999, the Specification for Structural Steel Buldings—
Allowable Stress Designand Plastic Design dated June 1, 1989, including Supplement
No. 1, the Specification for Allowable Stress Design of Single-Angle Members
dated June 1, 1989, the Load and Resistance Factor Design Specification for SingleAngle Members dated November 10, 2000, and the Load and Resistance Factor
Design Specification for the Design of Steel Hollow Structural Sections
dated November 10, 2000, and allprevious versions of these specifications.
Approved by the AISC Committee on Specifications and issued by the
AISC Board of Directors

AMERICAN INSTITUTE OF STEEL CONSTRUCTION, INC.
One East Wacker Drive, Suite 700
Chicago, Illinois 60601-1802

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Copyright c 2005
by
American Institute of SteelConstruction, Inc.
All rights reserved. This book or any part thereof
must not be reproduced in any form without the
written permission of the publisher.
The information presented in this publication has been prepared in accordance with
recognized engineering principles and is for general information only. While it is
believed to be accurate, this information should not be used or relied upon forany
specific application without competent professional examination and verification
of its accuracy, suitability, and applicability by a licensed professional engineer, designer, or architect. The publication of the material contained herein is not intended
as a representation or warranty on the part of the American Institute of Steel Construction or of any other person named herein, that thisinformation is suitable for
any general or particular use or of freedom from infringement of any patent or
patents. Anyone making use of this information assumes all liability arising from
such use.
Caution must be exercised when relying upon other specifications and codes developed by other bodies and incorporated by reference herein since such material
may be modified or amended from time totime subsequent to the printing of this
edition. The Institute bears no responsibility for such material other than to refer
to it and incorporate it by reference at the time of the initial publication of this
edition.
Printed in the United States of America

Specification for Structural Steel Buildings, March 9, 2005
AMERICAN INSTITUTE OF STEEL CONSTRUCTION, INC.

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DEDICATION

Professor Lynn S. Beedle

This edition of the AISC Specification is dedicated to the memory of Dr. Lynn S. Beedle,
University Distinguished Professor at Lehigh University. Dr. Beedle served as a faculty
member at Lehigh University for 41 years and won a very large number of professional
and educational awards,including the 1973 T.R. Higgins Award and the 2003 Geerhard
Haaijer Award from AISC. He was a major contributor to several editions of the AISC
Specification and a long-time member of the AISC Committee on Specifications. He was
instrumental in the development of plastic design methodologies and its implementation
into the AISC Specification. He was Director of the Structural Stability Research Councilfor 25 years, and in that role fostered understanding of various stability problems and
helped develop rational design provisions, many of which were adopted in the AISC
Specifications. In 1969, he founded the Council on Tall Buildings and Urban Habitat
and succeeded in bringing together the disciplines of architecture, structural engineering, construction, environment, sociology and politics,...