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چكيده انگليسي :

Numerical Study of Seismic Behavior of Precast Concrete Moment Resistant Reinforced Beam Column Connection Moein oddin Zafari Naeini m zafarinaeini@cv iut ac ir Date of Submission May 4 2011 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisors Dr Morteza Madhkhan madhkhan@cc iut ac ir Abstract Precast concrete structures have been considered due to various advantages in the constructionindustry by the recent decades On the other hand these member joints make problems such that somany failure modes have been observed during earthquakes because of collapses in theseconnections So the joints can be considered as one of the key points in the seismic behavior of thestructures Among these joints significant emphasis must be applied to beam column connection indesign and performance The objective of this thesis is to study the behavior of a type of precast concrete momentresistance beam column connection under lateral loading and to compare the performance of thisconnection to the monolithic connection system by the use of finite element method and nonlinearanalysis in ABAQUS application The precast connection is in the form of a continue beam crossthroughout the column The lower column longitudinal bars have been crossed through the existingholes in the beam and are anchored in a special type of sleeve in the lower part of the top column Itis necessary to explain that sleeves are a type of mechanical joints for connecting the bars In addition to study the performance of the connections the behavior of rebar joints withsleeves must be considered Thus the joint of rebar by the use of sleeve is modeled firstly and afterthe accuracy is ensured numerical analysis of the desired connection is performed using the resultobtained from this phase In the next phase of this thesis dedicated to the modeling of bothmonolithic and precast concrete connections outputs from numerical analysis are verified using theexperimental results Also in this phase the level of consideration of anchorage slip phenomenaeffects of reinforcement embedded in concrete in the models is examined In the third phase of this research study and comparison of the desired precast concrete momentresistant connection and the monolithic connection s behavior under various tensile andcompressive axial loads on the column is performed The results of the numerical analysis indicatevery good performance of precast connection in terms of stiffness strength and ductility comparedto the similar monolithic connection On the other hand the results of modeling reveal that achange in axial load from compression to tension in addition to decreasing stiffness strength andductility of both connections cause the change of fracture mode In case of applying pressure oncolumn failure of models is due to plastic hinges at the face of column in the beams and yieldingof transverse reinforcements in this region While in presence of tensile overload longitudinalreinforcement of the beams at plastic region yield initially like in pressure and at the end of lateralloading longitudinal reinforcement of the columns will yield KeywordsPrecast Concrete Structures Moment Resistant Beam Column Connection Sleeve FiniteElement Method Nonlinear Analysis Anchorage Slip

ظفري نائيني، معين الدين

بررسي عددي رفتار لرزه اي اتصال مقاوم خمشي تير به ستون بتني پيش ساخته

اسليو , روش اجزاي محدود , تحليل غير خطي , لغزش مهاري