ارائه و بررسي اتصالات مختلط تير فولادي و ستون بتني

چكيده انگليسي :

Behavior Evaluation of Steel Beam Concrete Column Composite Connections Hassan Zibasokhan h zibaskhan@cv iut ac ir Date of Submission May 25 2011 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisors Dr Farhad Behnamfar farhad@cc iut ac ir Dr Kiachehr Behfarnia kia@cc iut ac ir AbstractSteel beam concrete column composite structures have been widely studied during recent decades Suchstructures have lots of benefits including lower weight of the structure in large spans more ductility andenergy absorption specifications in contrast with concrete structures easy accomplishment of the criteria strong column weak beam and faster construction in contrast with concrete structures One of the mostimportant parts of such composite structures are their connections Up to now wide varieties of experimentson composite steel beam concrete column composite structures have been performed Since there exists lotsof ambiguities regarding the behavior of such connections most of codes are silent about the issue Mostresearches worked on the behavior of composite structures have focused on through beam type and a fewnumbers on through column type connections The main goal of this study is to present some details for through column type bending connection of steelbeam concrete column composite structures and to study the behavior of these connections and then tocompare them with concrete and steel connections To do this first the modeling procedure in the finiteelement software ABAQUS is briefly described and then three connections including steel concrete andcomposite connections are investigated by the software and accuracy results are verified by comparing themwith experimental results Then six different RCS connections are presented where steel cover plate has beenadopted in order to connect the beam to the column Connecting steel beam to concrete column is performedby three methods direct connection of beam to jacket using connection plates on flange level and usingoverall connection plates on flange level Connection of the jacket to column is performed by two methods studs and using channel for transfer shear Result of some samples is compared with result of PCI code forstuds in order to define acceptable capacity range Using result of this study a criteria for defining stud failurein the software is derived At the next step proposed connections are evaluated using ABAQUS software Comparing results ofsimulating with steel connection and monolithic concrete connection demonstrates that studs will fail beforecausing plastic hinge at beams Connection with channel and direct connection of flange have an ultimateload as steel joint and monolithic joint while connections having channel and plate on the flange level showa higher ultimate load Ductility of these three connections is as steel connection and more than concreteconnection Several parametric studies are performed on the presented connections which demonstrate that any increasein axial load while having confinement can postpone failure of studs and increases the ductility ofconnections having studs These studies also reports that decreasing in the thickness of steel jackets to lessthan the thickness of the flange can dramatically decrease the ultimate load of the connection while itsincrease to more levels than the thickness of the flange has fewer impacts Also in connections with plates onthe flange level sensitivity to thickness of the jacket highly decreases At the end of the thesis some initialdesign recommendations are presented based on the obtained computational results KeywordsSteel Beam Concrete Column composite connection Non linear Static Analysis FiniteElement Model Ductility Rigidity Strength Concrete Connection Steel Connection

زيباسخن، حسن

ارائه و بررسي اتصالات مختلط تير فولادي و ستون بتني

تحليل استاتيكي , مدل المان محدود , شكل پذيري , سختي , مقاومت