Preface(Fourth Edition)The third edition of the text-book had been published at 2006.Many readers appre-ciate this book comprehensibly.Before the forth edition,some statements errers in thisbook must be revised and emended.These contents are as follows:1.In page 438,the flow chart for calculating web capacity in plate girderis as shownin Fig.8.38 is divided into three parts as shown in Figs.8.38,8.39 and 8.40.2.In page 329,the Table 7.2 for equivalent moment factors of bi-symmetric sectionbeams under loads on shear center is divided into two tables,Tab.7.2 and Tab.7.3.3.The American National Standard Specification for Structural Steel BuildingsANSI/AI360-2005 combines Load and Resistance Factor Design (LRFD)and Allow-able Stress Design (ASD).Designers can be made according to either LRFD or ASDprovisions.In this revised text-book,the ASD method is complemented for the designsof axially loaded columnss,flexural members,beam-columns and plate girders.4.According to the theoretical analysis and test investigations,the stress distribu-tion of lipped stiffened elements is divided into three classes and at the first time,in AI-SI-1996,three corresponding design methods are provided,but in practice,the newNorth Ammerican Specification of the Cold-Formed Thin-Walled Steel Structures NASAISI-2001,only two design methods are provided but not three.5.The behavior of beam-to-column connection of semi-rigid connections and the de-sign of semi-ridig frames are introduced.The comparisons of different beam-to-columnbehaviors,stability designs of semi-rigid and rigid frames and rigidity requirements withnational rolded H-sections are precicated.Readers of the forth edition are urged to communicate with the author regarding allaspects of this book,particularly on identification of errors and auggestions for improve-ment,Chen JiProfessor of Structural EngineeringSchool of Civil EngineeringXi'an University of Architecture Technology·xix·興素村网Z.Z心.ET
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