6894

6436

كارشناسي ارشد

سازه

اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران

1390

[هفده]، 160ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

فرهاد بهنام فرد

مجتبي ازهري

2/5/91

محمدعلي رهگذر، كياچهر بهفرنيا

1396/09/14

كتابنامه

عمران

مهندسي عمران

ID6436

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

161 Moment Rotation Behavior of Welded Connections in Steel Structures Ehsan Soleimani e soleimani@cv iut ac ir Date of Submission February 28 2012 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors Dr Farhad Behnamfar farhad@cc iut ac ir AbstractStructural elements are linked through connections to form a structure If all aspects of true behavior ofconnection were not considered in design it acts as weak part of structure and decrease accuracy of analysis andconsequently cause problems in serviceability and safety of building Generally connections are considered aspinned or rigid in modeling but actually all them behave as semi rigid connections Many researches have been conducted in connection behavior during past decades Behavior curves consist ofmoment rotation curve were derived through some of these investigations to evaluate rotation of connectionscaused by moment in the joint Moment rotation curves are used to study effect of considering connections inanalysis of structure Welded connections are widely used in Iran But unfortunately there is few study on theseconnections specially on their behavior curves Failure in welded connections in buildings during earthquakes leads to incorrect beliefs about their behavior Experts in this field believe that connections designed based on codes regulations should not have seriousproblems Investigations on behavior of these connections after Northridge 1994 Cobe 1995 earthquakes confirm their proper behavior when are correctly reinforced Current study has been conducted to derive moment rotation curves of some welded connections based on FEMmodeling of these connections To achieve this goal firstly five experimental specimens are verified by FEMmodeling of these specimens to confirm modeling ability Then 210 specimens for 5 type of welded connectionare modeled in ABAQUS FEM software The Connections types are Double Web Angle Top and Seat Angle Top Angle with Stiffened Seat Moment Connection with Cover Plate and Moment Khorjini Connection A three parameter tangent inverse model has proposed for moment rotation behavior of these connections Theparameters are initial stiffness plastic stiffness and reference moment With these three parameters and usingtangent inverse model Moment rotation curve for connections can be derived Large part of this study is aboutdetermination of proposed model s parameters These parameters were determined with using semi analyticalrelations and have been compared with FEM results Also a macro model Torsion spring Model from each 5type of mentioned connections has been comprised with FEM response Result of this comparison show thatproposed model is efficient for modeling of connections KeywordsMoment Rotation curve weld stress strain curve Beam to column connections Semi rigid connections Finiteelement model

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مجتبي ازهري

محمدعلي رهگذر، كياچهر بهفرنيا