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Specification for Structural Steel Buildings ______

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Specification for Structural Steel Buildings ______ _________________________ Specification for Structural Steel Buildings _________________________ PUBLIC REVIEW DRAFT DATED March 2, 2015 Supersedes the Specification for Structural Steel Buildings dated June 22, 2010 and all previous versions of this specification. Approved by the AISC Committee on Specifications AMERICAN INSTITUTE OF STEEL CONSTRUCTION One East Wacker Drive, Suite 700 Chicago, Illinois 60601-1802 Copyright © 20?? by American Institute of Steel Construction 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 for any 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 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 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 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 the initial publication of this edition. Printed in the United States of America 1 Symbols 2 3 Some definitions in the list below have been simplified in the interest of 4 brevity. In all cases, the definitions given in the body of the Specification 5 govern. Symbols without text definitions, used only in one location and 6 defined at that location are omitted in some cases. The section or table 7 number in the righthand column refers to the Section where the symbol is 8 first used. 9 10 Symbol Definition Section 11 2 2 12 ABM Cross-sectional area of the base metal, in. (mm ) ...................... J2.4 2 2 13 Ab Nominal unthreaded body area of bolt or threaded part, in. (mm )J3.6 2 2 14 Abi Cross-sectional area of the overlapping branch, in. (mm )Table K3.2 2 2 15 Abj Cross-sectional area of the overlapped branch, in. (mm )Table K3.2 2 2 16 Ac Area of concrete, in. (mm ) ..................................................... I2.1b 2 2 17 Ac Area of concrete slab within effective width, in. (mm ) ......... I3.2d 2 2 18 Ae Effective net area, in. (mm ) ........................................................ D2 19 Ae Summation of the effective areas of the cross section based on the 2 2 20 reduced effective width, be, in. (mm ) ...................................... E7.2 2 2 21 Afc Area of compression flange, in. (mm ) .................................... G3.1 2 2 22 Afg Gross area of tension flange, in. (mm ) .................................. F13.1 2 2 23 Afn Net area of tension flange, in. (mm ) ..................................... F13.1 2 2 24 Aft Area of tension flange, in. (mm ) ............................................. G3.1 2 2 25 Ag Gross cross-sectional area of member, in. (mm ) ..................... B3.3 2 2 26 Ag Gross area of composite member, in. (mm ) ............................. I2.1 2 2 27 Agv Gross area subject to shear, in. (mm ) ....................................... J4.2 2 2 28 An Net area of member, in. (mm ) ................................................ B4.3 2 2 29 An Area of the directly connected elements, in. (mm ) ....... Table D3.1 2 2 30 Ant Net area subject to tension, in. (mm ) ........................................ J4.3 2 2 31 Anv Net area subject to shear, in. (mm ) .......................................... J4.2 2 2 32 Apb Projected area in bearing, in. (mm ) ............................................. J7 2 2 33 As Cross-sectional area of steel section, in. (mm ) ....................... I2.1b 2 2 34 Asa Cross-sectional area of steel headed stud anchor, in. (mm ) ... I8.2a 2 2 35 Asf Area on the shear failure path, in. (mm ) ................................. D5.1 2 2 36 Asr Area of continuous reinforcing bars, in. (mm ) ......................... I2.1 37 Asr Area of adequately developed longitudinal reinforcing steel within 38 the effective width of the concrete slab, in.2 (mm2) .................. I3.2d 2 2 39 At Net area in tension, in. (mm ) ............................................. App. 3.4 40 Aw Area of web, the overall depth times the web thickness, dtw, 41 in.2 (mm2) ................................................................................... G2.1 2 2 42 Awe Effective area of the weld, in. (mm ) ........................................ J2.4 2 2 43 A1 Loaded area of concrete, in. (mm ) .......................................... I6.3a 44 A1 Area of steel concentrically bearing on a concrete support, 45 in.2 (mm2) ....................................................................................... J8 46 A2 Maximum area of the portion of the supporting surface that is 47 geometrically similar to and concentric with the loaded area, in.2 48 (mm2) ............................................................................................. J8 Specification for Structural Steel Buildings, public review draft dated March 2, 2015 AMERICAN INSTITUTE OF STEEL CONSTRUCTION 2 49 B Overall width of rectangular HSS member, measured 90 to the 50 plane of the connection, in. (mm) ................................... Table D3.1 51 Bb Overall width of rectangular HSS branch member or plate, 52 measured 90 to the plane of the connection, in. (mm) ............. K1.1 53 Be Effective width of rectangular HSS branch or plate, measured 90 54 to the plane of the connection, in. (mm)………………………K1.2 55 Bei Effective width of the overlapping branch, in. (mm)...…Table K3.2 56 Bej Effective width of the overlapping branch, in. (mm)...…Table K3.2 57 Bbi Overall width of the overlapping branch, in. (mm) ................... K3.2 58 Bbj Overall width of the overlapped branch, in. (mm) .................... K3.2 59 Bp Width of plate, measured 90 to the plane of the connection, 60 in. (mm) ........................................................................... Table K2.2 61 B1 Multiplier to account for P- effects .................................... App.8.2 62 B2 Multiplier to account for P- effects .................................... App.8.2 63 C HSS torsional constant ............................................................... H3.1 64 Cb Lateral-torsional buckling modification factor for nonuniform 65 moment diagrams ......................................................................... F1 66 Cd Coefficient accounting for increased required bracing stiffness at 67 inflection point ............................................................... App. 6.3.1a 68 Cf Constant from Table A-3.1 for the fatigue category ............ App. 3.3 69 Cm Coefficient accounting for non-uniform moment ............ App. 8.2.1 70 Cp Ponding flexibility coefficient for primary member in a 71 flat roof ............................................................................... App. 2.1 72 Cr Coefficient for web sidesway buckling ................................... J10.4 73 74 Cs Ponding flexibility coefficient for secondary member in a 75 flat roof ............................................................................... App. 2.1 76 CvB Web shear buckling coefficient ................................................ G2.1 77 CvPB Web shear post buckling strength coefficient………………. ..G2.1 6 6 78 Cw Warping constant, in. (mm ) ...................................................... E4 79 C1 Coefficient for calculation of effective rigidity of encased 80 composite compression member ............................................... I2.1b 81 C2 Edge distance increment ................................................... Table J3.5 82 C3 Coefficient for calculation of effective rigidity of filled composite 83 compression member ................................................................ I2.2b 84 D Outside diameter of round HSS, in. (mm) ....................... Table B4.1 85 D Outside diameter of round HSS main member, in. (mm) .......... K1.1 86 D Nominal dead load, kips (N) ...................................................... B3.9 87 Db Outside diameter of round HSS branch member, in. (mm) ....... K1.1 88 Du In slip-critical connections, a multiplier that reflects the ratio of the 89 mean installed bolt pretension to the specified minimum bolt 90 pretension ................................................................................... J3.8 91 E Modulus of elasticity of steel = 29,000 ksi (200 000 MPa) ............... 92 ......................................................................................... Table B4.1 1.5 1.5 93 Ec Modulus of elasticity of concrete = wfcc , ksi ( 0.043wfcc , 94 MPa) ......................................................................................... I2.1b 95 Es Modulus of elasticity of steel = 29,000 ksi (200 000 MPa) ..... I2.1b Specification for Structural Steel Buildings, public review draft dated March 2, 2015 AMERICAN INSTITUTE OF STEEL CONSTRUCTION
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