Guide to the De sign of Out-of-Plane Wall An chor age: Based on the 2006/2009 IBC and ASCE/SEI 7-05 ISBN:

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2 Guide to the De sign of Out-of-Plane Wall An chor age: Based on the 2006/2009 IBC and ASCE/SEI 7-05 ISBN: Cover De sign: Dianna Hallmark Man ager of De vel op ment: John Henry Project Editor: Kathleen DeMase Pub li ca tions Man ager: Mary Lou Luif Type set ting: Sue Brock man COPY RIGHT 2010 by NCSEA Published by ICC ALL RIGHTS RESERVED. This pub li ca tion is a copy righted work owned by the National Coun cil of Struc tural Engi - neers Asso ci a tions (NCSEA). With out advance writ ten per mis sion from the copy right owner, no part of this book may be repro duced, dis trib uted or trans mit ted in any form or by any means, includ ing, with out lim i ta tion, elec tronic, opti cal or mechan i cal means (by way of exam ple, and not lim i ta tion, pho to copy ing or record ing by or in an infor ma tion stor age retrieval sys tem). For infor ma tion on per mis sion to copy mate rial exceed ing fair use, please con tact: Pub li ca tions, 4051 West Flossmoor Road, Coun try Club Hills, IL Phone ICC-SAFE ( ). The infor ma tion con tained in this doc u ment is believed to be accu rate; how ever, it is being pro vided for infor ma tional pur poses only and is intended for use only as a guide. Pub li ca tion of this doc u ment by the ICC should not be con strued as the ICC, NCSEA, or the author engag ing in or ren der ing engi neer ing, legal or other pro fes sional ser vices. Use of the infor ma tion con tained in this work book should not be con sid ered by the user to be a sub sti tute for the advice of a reg is - tered pro fes sional engi neer, attor ney or other pro fes sional. If such advice is required, it should be sought through the ser - vices of a reg is tered pro fes sional engi neer, licensed attor ney or other pro fes sional. First Print ing: July 2010 PRINTED IN THE U.S.A.

3 iii Preface This design guide presents a comprehensive summary of and practical applications for out-of-plane wall load provisions and design criteria for both seismic and wind forces as presented in the 2006/2009 International Building Code (2006/2009 IBC) and Minimum Design Loads for Buildings and Other Structures (ASCE/SEI 7-05). The provisions and criteria presented in this book are organized by load type and element type (i.e., structural wall, nonstructural wall, parapet and anchorage) for easy illustration and mental grouping. The material in this book is intended for use by licensed structural engineers or those working directly for licensed structural engineers. Many of the examples in this book require engineering judgment and assumptions made on certain examples may or may not be applicable to an unrelated building being considered separately by a structural engineer. In addition, this design guide focuses on design for out-of-plane loads. Simultaneous demands and/or serviceability criteria may require special design details in some cases. The discussion and examples in Chapters 2 through 4 are based on both the 2009 IBC and the 2006 IBC. Both of these building codes reference ASCE/SEI 7-05 making load determination differences minor. However, Chapters 5 and 6 rely heavily on material standards, some of which have undergone significant changes between the two building codes. Hence, Chapters 5 and 6 have been authored in accordance with the 2006 IBC only. Each example in the book is presented using concept-oriented instruction whereby the problems are independent of previous solutions and minor problem modifications are utilized to maximize learning of key concepts while studying this guide.

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5 v Acknowledgement The following individuals helped the author in preparing some of the examples presented in the Design Guide: Steven Fulmer, Graduate Student, NC State Jordan Panter, Citadel Cadet The author recognizes and thanks the above individuals sincerely for their contribution, which has helped result in the publication of this guide. The author is also highly thankful to the following individuals for reviewing the design examples presented in the Design Guide. Their useful suggestions have resulted in enhancing the clarity of the Design Guide. John Henry, P.E. Badri K. Prasad, P.E., S.E. Bryan D. Frank, P.E., S.E. Michael McLean, Citadel Cadet Joshua Olson, Citadel Cadet The author greatly appreciates the many others that reviewed certain problems in their area of expertise. The National Council of Structural Engineers Associations (NCSEA) acknowledges the hard work of the NCSEA Publications Committee. This group consists of individuals from many backgrounds including: consulting engineering, research, education, design and private practice. Individuals who serve on the NCSEA Publications Committee include: Timothy W. Mays, Ph.D., P.E., Chairman Roberto Leon, Ph.D., P.E. Clem McCarey, P.E. C. Michael Donoghue, P.E. Chun Lau, P.E. Jon P. Kiland, S.E., SECB John Finke, P.E.

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7 vii About the Author Timothy W. Mays, Ph.D., P.E. Dr. Mays received his Bachelor s Degree in Civil Engineering from the University of Memphis in He received both of his graduate degrees from Virginia Tech. His M.S.C.E. research focused on structural/coastal engineering and his Ph.D. research was in the field of structural/earthquake engineering. He is currently an Associate Professor of Civil Engineering at The Citadel in Charleston, SC. After founding both organizations, Dr. Mays served as Executive Director of the Structural Engineers Association of South Carolina and the Structural Engineers Association of North Carolina. Additionally, he currently serves as Chairman of the Structural Technical Group for ASCE SC Section and NCSEA Publications Committee Chairman. He has received two national teaching awards (ASCE and NSPE) and both national (NSF) and regional (ASEE) awards for outstanding research. Most recently, he was honored as the recipient of NCSEA s 2009 Service Award. He is a prolific speaker who sits on several code writing committees and his areas of expertise are code applications, structural design, seismic design, steel connections, structural dynamics and civil engineering aspects of antiterrorism. He is the proud father of Jack, Hudson and Evy, and recently celebrated his tenth year of marriage to his wife Jennifer.

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9 ix Table of Contents Preface...iii Acknowledgement...v About the Author...vii Chapter 1: Introduction Scope Damage to Existing Buildings from Natural Disasters 1 Chapter 2: Code Requirements for Wind and Seismic Forces Scope Components and Cladding Wind Load Determination Methods Method 1 Simplified Procedure Method 2 Analytical Procedure Method 2A Alternate All-Heights Procedure Out-of-Plane Seismic Load Requirements Seismic Design Category A Seismic Design Category B Seismic Design Categories C, D, E and F 21 Chapter 3: Wind Load Determination Scope 27 Chapter 4: Seismic Load Determination Scope 67

10 x Chapter 5: Anchorage Scope 97 Chapter 6: Subdiaphragms Scope 147