Aisc Design Guide 2

Steel Design Guide Series
Steel and Composite Beams with

Web Openings

Steel Design Guide Series

Steel and Composite Beams with Web Openings
Design of Steel and Composite Beams with Web Openings
David Darwin Professor of Civil Engineering University of Kansas Lawrence, Kansas

A M E R I C A N

I N S T I T U T E

OF

S T E E L

C O N S T R U C T I O N

© 2003 by AmericanInstitute of Steel Construction, Inc. All rights reserved. This publication or any part thereof must not be reproduced in any form without permission of the publisher.

Copyright  1990 by American Institute of Steel Construction, 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 presentedin 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 for any specific application without competent professional examination and verification of its accuracy, suitablility, 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 this information 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 liabilityarising 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 to time 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 theinitial publication of this edition. Printed in the United States of America Second Printing: September 1991 Third Printing: October 2003

© 2003 by American Institute of Steel Construction, Inc. All rights reserved. This publication or any part thereof must not be reproduced in any form without permission of the publisher.

TABLE OF CONTENTS
INTRODUCTION . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 1 4.5 Example 3: Composite Beam with Unreinforced Opening . . . . . . . . . . . . . . . . . . . . . 27 4.6 Example 4: Composite Girder with Unreinforced and Reinforced Openings . . . . . . . . 30 BACKGROUND AND COMMENTARY . . . . . . . . . . 5.1 G e n e r a l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2 Behavior of Members with Web Openings . . . . .5.3 Design of Members with Web Openings . . . . . . 5.4 Moment-Shear Interaction . . . . . . . . . . . . . . . . . . 5.5 Equations for Maximum Moment Capacity . . . . 5.6 Equations for Maximum Shear Capacity . . . . . . 5.7 Guidelines for Proportioning and Detailing Beams with Web Openings . . . . . . . . . . . . . . . . . 5.8 Allowable Stress Design . . . . . . . . . . . . . . . . . . . .DEFLECTIONS.............................. 6.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2 Design Approaches . . . . . . . . . . . . . . . . . . . . . . . . 6.3 Approximate Procedure . . . . . . . . . . . . . . . . . . . . . 6.4 Improved Procedure . . . . . . . . . . . . . . . . . . . . . . . 6.5 Matrix A n a l y s i s . . . . . . . . . . . . . . . . . . . . . . . . . .. REFERENCES................................ 37 37 37 40 41 42 44 48 50 51 51 51 51 52 53 55

DEFINITIONS AND NOTATION . . . . . . . . . . . . . . . 3 2.1 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 N o t a t i o n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 DESIGN OF MEMBERS WITH WEB OPENINGS 3.1 G e n e r a l . . . . . . . . . . ....