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ANSI/AISC 341-16An American National StandardSeismic Provisionsfor Structural Steel BuildingsJuly 12, 2016Supersedes the Seismic Provisions for Structural Steel Buildingsdated June 22, 2010 and all previous versionsApproved by the Committee on SpecificationsAMERICAN INSTITUTE OF STEEL CONSTRUCTION130 East Randolph Street, Suite 2000, Chicago, Illinois 60601www.aisc.orgBlue Cover A341-16.indd 15/15/2017 11:37:03 AM
ANSI/AISC 341-16An American National StandardSeismic Provisionsfor Structural Steel BuildingsJuly 12, 2016Supersedes the Seismic Provisions for Structural Steel Buildingsdated June 22, 2010 and all previous versionsApproved by the Committee on SpecificationsAMERICAN INSTITUTE OF STEEL CONSTRUCTION130 East Randolph Street, Suite 2000, Chicago, Illinois 60601www.aisc.orgAISC SP SPEC 341 01 FM.indd 15/5/17 1:45 PM
9.1-iiAISC 2016byAmerican Institute of Steel ConstructionAll rights reserved. This book or any part thereofmust not be reproduced in any form without thewritten permission of the publisher.The AISC logo is a registered trademark of AISC.The information presented in this publication has been prepared by a balanced committeefollowing American National Standards Institute (ANSI) consensus procedures andrecognized principles of design and construction. While it is believed to be accurate, thisinformation should not be used or relied upon for any specific application without competentprofessional examination and verification of its accuracy, suitability and applicability by alicensed engineer or architect. The publication of this information is not a representationor warranty on the part of the American Institute of Steel Construction, its officers, agents,employees or committee members, or of any other person named herein, that this informationis suitable for any general or particular use, or of freedom from infringement of any patent orpatents. All representations or warranties, express or implied, other than as stated above, arespecifically disclaimed. Anyone making use of the information presented in this publicationassumes all liability arising from such use.Caution must be exercised when relying upon standards and guidelines developed by otherbodies and incorporated by reference herein since such material may be modified or amendedfrom time to time subsequent to the printing of this edition. The American Institute of SteelConstruction bears no responsibility for such material other than to refer to it and incorporateit by reference at the time of the initial publication of this edition.Printed in the United States of AmericaSeismic Provisions for Structural Steel Buildings, July 12, 2016American Institute of Steel ConstructionAISC SP SPEC 341 01 FM.indd 25/5/17 1:45 PM
9.1-iiiPREFACE(This Preface is not a part of ANSI/AISC 341-16, Seismic Provisions for Structural SteelBuildings, but is included for informational purposes only.)AISC 360, Specification for Structural Steel Buildings (ANSI/AISC 360-16) is intended tocover common design criteria. Accordingly, it is not feasible for it to also cover all of thespecial and unique problems encountered within the full range of structural design practice. This document, Seismic Provisions for Structural Steel Buildings (ANSI/AISC 341-16)(hereafter referred to as the Provisions), is a separate consensus standard that addresses onesuch topic: the design and construction of structural steel and composite structural steel/reinforced concrete building systems specifically detailed for seismic resistance.The Symbols, Glossary, and Abbreviations are all considered part of this document.Accompanying the Provisions is a nonmandatory Commentary with background information and nonmandatory user notes interspersed throughout to provide guidance on thespecific application of the document.A number of significant technical modifications have also been made since the 2010 edition of the Provisions, including the following: Inclusion of ASTM A1085/A1085M material New provisions for diaphragms, chords and collectors, particularly horizontaltruss diaphragms Inclusion of Ry in Table D1.1 for more accurate slenderness limits and to avoiduse of lower Fy values for dual-certified material Requirement that simultaneous inelasticity be considered for columns participating in two or more seismic force resisting systems Clearer provisions on required strength of column splices and bases, includinga reduced shear for column bases, returning the requirements to closer to thosein the 2005 Provisions Allowance for non-full strength connections in special moment frames Option to use partial-joint-penetration groove welds in moment-frame columnsplices Revised and clarified continuity plate, doubler plate, and associated weldingprovisions Multi-tiered braced frame provisions for ordinary concentrically braced frames,special concentrically braced frames, and buckling-restrained braced frames Numerous revisions to special plate shear wall requirements New application of composite plate shear wall system using concrete-filledsteel panel walls Power-actuated fasteners permitted in the protected zone up to a certain diameter New criteria to prequalify connections for composite moment framesSeismic Provisions for Structural Steel Buildings, July 12, 2016American Institute of Steel ConstructionAISC SP SPEC 341 01 FM.indd 35/5/17 1:45 PM
9.1-ivPREFACEThe AISC Committee on Specifications, Task Committee 9—Seismic Design is responsible for the ongoing development of these Provisions. The AISC Committee on Specificationsgives final approval of the document through an ANSI-accredited balloting process, andhas enhanced these Provisions through careful scrutiny, discussion and suggestions forimprovement. The contributions of these two groups, comprising well more than 80 structural engineers with experience from throughout the structural steel industry, is gratefullyacknowledged. AISC further acknowledges the significant contributions of the BuildingSeismic Safety Council (BSSC), the Federal Emergency Management Agency (FEMA), theNational Science Foundation (NSF), and the Structural Engineers Association of California(SEAOC).This specification was approved by the Committee on Specifications:R. Shankar Nair, ChairmanPatrick J. Fortney, Vice-ChairmanAllen AdamsTaha D. Al-ShawafWilliam F. BakerJohn M. Barsom, EmeritusReidar BjorhovdeRoger L. Brockenbrough, EmeritusCharles J. CarterGregory G. DeierleinCarol J. DruckerW. Samuel EasterlingDuane S. Ellifritt, EmeritusBruce R. Ellingwood, EmeritusMichael D. EngelhardtShu-Jin Fang, EmeritusSteven J. Fenves, EmeritusJames M. FisherJohn W. Fisher, EmeritusTheodore V. Galambos, EmeritusLouis F. GeschwindnerRamon E. GilsanzLawrence G. GriffisJohn L. Gross, IIIJerome F. HajjarPatrick M. HassettTony C. HazelRichard A. Henige, Jr.Mark V. HollandJohn D. HooperNestor R. IwankiwWilliam P. Jacobs, VRonald J. JanowiakLawrence A. KloiberLawrence F. KruthJay W. LarsonRoberto T. LeonJames O. MalleyDuane K. MillerLarry S. MuirThomas M. MurrayDouglas A. Rees-EvansRafael SabelliThomas A. SabolBenjamin W. SchaferRobert E. Shaw, Jr.Donald R. ShermanW. Lee ShoemakerWilliam A. ThorntonRaymond H.R. Tide, EmeritusChia-Ming UangAmit H. VarmaDonald W. WhiteRonald D. ZiemianCynthia J. Duncan, SecretaryThe Committee honors former members, David L. McKenzie, Richard C. Kaehler andKeith Landwehr, and advisory member, Fernando Frias, who passed away during this cycle.Seismic Provisions for Structural Steel Buildings, July 12, 2016American Institute of Steel ConstructionAISC SP SPEC 341 01 FM.indd 45/5/17 1:45 PM
PREFACE9.1-vThe Committee gratefully acknowledges the following task committee (TC 9—SeismicDesign) for their development of this document.James O. Malley, ChairmanC. Mark Saunders, Vice ChairmanMichel BruneauGregory G. DeierleinRichard M. DrakeMichael D. EngelhardtTimothy P. FraserSubhash C. GoelJerome F. HajjarRonald O. HamburgerJames R. HarrisPatrick M. HassettJohn D. HooperLawrence KloiberRoberto T. LeonBonnie E. ManleyPatrick S. McManusJohn A. RolfesRafael SabelliThomas A. SabolBahram M. ShahroozRobert E. Shaw, Jr.W. Lee ShoemakerKurt D. SwenssonRobert TremblayJamie WinansLeigh Arber, SecretarySeismic Provisions for Structural Steel Buildings, July 12, 2016American Institute of Steel ConstructionAISC SP SPEC 341 01 FM.indd 55/5/17 1:45 PM
Seismic Provisions for Structural Steel Buildings, July 12, 2016American Institute of Steel ConstructionAISC SP SPEC 341 01 FM.indd 65/5/17 1:45 PM
9.1-viiTABLE OF CONTENTSSYMBOLS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxxiGLOSSARY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxxviiiABBREVIATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xlvPROVISIONSA.B.C.GENERAL REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A1.Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A2.Referenced Specifications, Codes and Standards . . . . . . . . . . . . . . . . . . . . . . 2A3.Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. Material Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. Expected Material Strength. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3. Heavy Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4. Consumables for Welding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4a. Seismic Force-Resisting System Welds . . . . . . . . . . . . . . . . . . . . . . . . .4b. Demand Critical Welds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5. Concrete and Steel Reinforcement . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33456667A4.Structural Design Drawings and Specifications. . . . . . . . . . . . . . . . . . . . . . . .1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. Steel Construction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3. Composite Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7788GENERAL DESIGN REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9B1.General Seismic Design Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9B2.Loads and Load Combinations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9B3.Design Basis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101. Required Strength. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102. Available Strength. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10B4.System Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10B5.Diaphragms, Chords and Collectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102. Truss Diaphragms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10ANALYSIS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12C1.General Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12C2.Additional Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12C3.Nonlinear Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Seismic Provisions for Structural Steel Buildings, July 12, 2016American Institute of Steel ConstructionAISC SP SPEC 341 01 FM.indd 75/5/17 1:45 PM
9.1-viiiD.TABLE OF CONTENTSGENERAL MEMBER AND CONNECTIONDESIGN REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13D1.Member Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. Classification of Sections for Ductility. . . . . . . . . . . . . . . . . . . . . . . . .1a. Section Requirements for Ductile Members. . . . . . . . . . . . . . . . . . . . .1b. Width-to-Thickness Limitations of Steel and Composite Sections. . . .2. Stability Bracing of Beams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2a. Moderately Ductile Members. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2b. Highly Ductile Members. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2c. Special Bracing at Plastic Hinge Locations . . . . . . . . . . . . . . . . . . . . .3. Protected Zones. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4. Columns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4a. Required Strength. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4b. Encased Composite Columns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4c. Filled Composite Columns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5. Composite Slab Diaphragms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5a. Load Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5b. Nominal Shear Strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6. Built-Up Structural Steel Members. . . . . . . . . . . . . . . . . . . . . . . . . . . .1313131317171818202020202323232324D2.Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. Bolted Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3. Welded Joints. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4. Continuity Plates and Stiffeners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5. Column Splices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5a. Location of Splices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5b. Required Strength. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5c. Required Shear Strength. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5d. Structural Steel Splice Configurations . . . . . . . . . . . . . . . . . . . . . . . . .5e. Splices in Encased Composite Columns. . . . . . . . . . . . . . . . . . . . . . . .6. Column Bases. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6a. Required Axial Strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6b. Required Shear Strength. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6c. Required Flexural Strength. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7. Composite Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8. Steel Anchors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2424242525262626272727272828293031D3.Deformation Compatibility of Non-SFRS Members and Connections. . . . . 31D4.H-Piles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. Design Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. Battered H-Piles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3. Tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4. Protected Zone. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3232323232Seismic Provisions for Structural Steel Buildings, July 12, 2016American Institute of Steel ConstructionAISC SP SPEC 341 01 FM.indd 85/5/17 1:45 PM
TABLE OF CONTENTSE.9.1-ixMOMENT-FRAME SYSTEMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33E1.Ordinary Moment Frames (OMF). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. Basis of Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3. Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4. System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5. Members. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5a. Basic Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5b. Protected Zones. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6. Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6a. Demand Critical Welds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6b. FR Moment Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6c. PR Moment Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .333333333333333434343435E2.Intermediate Moment Frames (IMF). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. Basis of Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3. Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4. System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4a. Stability Bracing of Beams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5. Members. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5a. Basic Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5b. Beam Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5c. Protected Zones. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6. Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6a. Demand Critical Welds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6b. Beam-to-Column Connection Requirements . . . . . . . . . . . . . . . . . . . .6c. Conformance Demonstration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6d. Required Shear Strength. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6e. Panel Zone. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6f. Continuity Plates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6g. Column Splices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .363636363636363637373737383838393939E3.Special Moment Frames (SMF). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. Basis of Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3. Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4. System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4a. Moment Ratio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4b. Stability Bracing of Beams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4c. Stability Bracing at Beam-to-Column Connections. . . . . . . . . . . . . . .5. Members. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5a. Basic Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39393940404041424343Seismic Provisions for Structural Steel Buildings, July 12, 2016American Institute of Steel ConstructionAISC SP SPEC 341 01 FM.indd 95/5/17 1:45 PM
9.1-xTABLE OF CONTENTS5b.5c.6.6a.6b.6c.6d.6e.6f.6g.Beam Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Protected Zones. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Demand Critical Welds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Beam-to-Column Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Conformance Demonstration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Required Shear Strength. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Panel Zone. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Continuity Plates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Column Splices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43434444444545464850E4.Special Truss Moment Frames (STMF). . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. Basis of Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3. Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3a. Special Segment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3b. Nonspecial Segment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4. System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4a. Special Segment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4b. Stability Bracing of Trusses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4c. Stability Bracing of Truss-to-Column Connections . . . . . . . . . . . . . . .4d. Stiffness of Stability Bracing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5. Members. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5a. Basic Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5b. Special Segment Members . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5c. Expected Vertical Shear Strength of Special Segment . . . . . . . . . . . . .5d. Width-to-Thickness Limitations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5e. Built-Up Chord Members. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5f. Protected Zones. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6. Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6a. Demand Critical Welds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6b. Connections of Diagonal Web Members in the Special Segment. . . . .6c. Column Splices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . dinary Cantilever Column Systems (OCCS). . . . . . . . . . . . . . . . . . . . . . .1. Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. Basis of Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3. Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4. System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4a. Columns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4b. Stability Bracing of Columns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5. Members. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5a. Basic Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5b. Column Flanges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56565656565656565656Seismic Provisions for Structural Steel Buildings, July 12, 2016American Institute of Steel ConstructionAISC SP SPEC 341 01 FM.indd 105/5/17 1:45 PM
TABLE OF CONTENTSE6.F.9.1-xi5c. Protected Zones. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6. Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6a. Demand Critical Welds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6b. Column Bases. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56565656Special Cantilever Column Systems (SCCS). . . . . . . . . . . . . . . . . . . . . . . . .1. Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. Basis of Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3. Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4. System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4a. Columns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4b. Stability Bracing of Columns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5. Members. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5a. Basic Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5b. Column Flanges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5c. Protected Zones. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6. Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6a. Demand Critical Welds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6b. Column Bases. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5757575757575757575757585858BRACED-FRAME AND SHEAR-WALL SYSTEMS. . . . . . . . . . . . . . . . . . . . . 59F1.F2.Ordinary Concentrically Braced Frames (OCBF). . . . . . . . . . . . . . . . . . . . .1. Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. Basis of Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3. Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4. System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4a. V-Braced and Inverted V-Braced Frames . . . . . . . . . . . . . . . . . . . . . . .4b. K-Braced Frames. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4c. Multi-Tiered Braced Frames. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5. Members. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5a. Basic Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5b. Slenderness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5c. Beams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6. Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6a. Brace Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7. Ordinary Concentrically Braced Frames aboveSeismic Isolation Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7a. System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7b. Members. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5959595959596060616161626262Special Concentrically Braced Frames (SCBF). . . . . . . . . . . . . . . . . . . . . . .1. Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. Basis of Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3. Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4. System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6262636364626262Seismic Provisions for Structural Steel Buildings, July 12, 2016American Institute of Steel ConstructionAISC SP SPEC 341 01 FM.indd 115/5/17 1:45 PM
9.1-xiiTABLE OF teral Force Distribution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .V- and Inverted V-Braced Frames. . . . . . . . . . . . . . . . . . . . . . . . . . . . .K-Braced Frames. . . . . . . .
(This Preface is not a part of ANSI/AISC 341-16, Seismic Provisions for Structural Steel Buildings, but is included for informational purposes only.) AISC 360, Specification for Structural Steel Buildings (ANSI/AISC 360-16) is intended to cover common design criteria. Accordingly, it is not feasible for it to also cover all of the
