AISC-360 美国钢结构建筑规范

(This Preface is not part of ANSI/AISC 360-16,Specification for Structural Steel Buildings,but is included for informational purposes only.)This Specification is based upon past successful usage,advances in the state of knowledge,and changes in design practice.The 2016 American Institute of Steel Construction's Specification for Structural Steel Buildings provides an integrated treatment of allowable
strength design (ASD)and load and resistance factor design (LRFD),and replaces earlier Specifications.As indicated in Chapter B of the Specification,designs can be made accord-ing to either ASD or LRFD provisions.
This ANSI-approved Specification has been developed as a consensus document using ANSI-accredited procedures to provide a uniform practice in the design of steel-framed buildings and other structures.The intention is to provide design criteria for routine use and not to provide specific criteria for infrequently encountered problems,which occur in thefull range of structural design.
This Specification is the result of the consensus deliberations of a committee of structural engineers with wide experience and high professional standing,representing a wide geo-graphical distribution throughout the United States.The committee includes approximately
equal numbers of engineers in private practice and code agencies,engineers involved in research and teaching,and engineers employed by steel fabricating and producing compa-nies.The contributions and assistance of more than 50 additional professional volunteers working in task committees are also hereby acknowledged.
The Symbols,Glossary,Abbreviations and Appendices to this Specification are an inte-gral part of the Specification.A nonmandatory ommentary has been prepared to provide background for the Specification provisions and the user is encouraged to consult it.
Additionally,nonmandatory User Notes are interspersed throughout the Specification to provide concise and practical guidance in the application of the provisions.
A number of significant technical modifications have also been made since the 2010 edition of the Specification,including the following:
·Adopted an ASTM umbrella bolt specification,ASTMF3l25,that includes Grades A325,A325M,A490,A490M,F1852amdF2280·Adopted new ASTM HSS material specifications.ASTM A1085/A1085 M and A1065/A1065M,that permit use of a design thickness equal to the full nominal thickness of themember Expanded the structural integrity provisions applicable to connection design Added a shear lag factor for welded plates or connected elements with unequal length longitudinal welds The available compressive strength for double angles and tees is determined by the general flexural-torsional buckling equation for members without slender elements·Added a constrained-axis torsional buckling limit state for members with lateral bracing offset from the shear center Revised the available compressive strength formulation for members with slender com-pression elements Reformulated the available flexural strength provisions for tees and double angles Revised the shear strength of webs of certain I-shapes and channels without tension field
action and when considering tension field action·Increased the limit on rebar strength to8 0 ksi for composite columns ·Incorporated provisions for applying the direct analysis method to composite members ·Inserted general requirements to address minimum composite action in composite beams Revised the provisions for bolts in combination with welds
Increased minimum pretension for 1/s-in.-diameter and larger bolts·Increased standard hole sizes and short-slot and long-slot widths for 1-in.-diameter and larger bolts Reorganized the HSS connection design provisions in Chapter K,including reference to Chapter J for some limit states Expanded provisions in Appendix I for direct modeling of member imperfections and inelasticity that may be used with the direct analysis method Inserted a table of properties of high-strength bolts at elevated temperatures in Appendix4 The reader is cautioned that professional judgment must be exercised when data or recommendations in the Specification are applied,as described more fully in the disclaimer notice preceding this Preface.

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