كنترل خسارت زلزله با استفاده از اتصالات خمشي مجهز به ميراگرهاي ويسكوپلاستيك

چكيده انگليسي :

131 Seismic Damage Control Using Moment Connections Equipped with Visco Plastic Dampers Abolhasan Banisheykholeslami A banisheykholeslami@cv iut ac ir 22th January 2013 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Farhad Behnamfar farhad@cc iut ac irAbstract Steel structures in seismic zones are designed for stiffness strength and ductility Stiffness is requiredfor limitation of damage of non structural elements and reduction of the second order effects Strength isrequired for a safe transmission of the acting forces and moments Ductility under cyclic loading leads to thedissipation of the input seismic energy and results in a reduction of the seismic forces In such structures energy absorption is accomplished through plastic deformation in certain areas called plastic hinges Repairing damage after earthquake is very costly time consuming and sometimes impossible Given the slowpace of structural repair and retrofit to cope with future earthquakes the idea of using a control systems in astructure has been proposed Passive control systems are among the most common and cheapest form ofdamage control systems In these systems input earthquake energy dissipation is concentrated in specialdevices with good and stable hysteresis behavior Different types of energy dampers developed and used instructures In this study a new visco plastic damper is developed This damper have been uses viscoelasticmaterial properties and yielding of metallic materials for energy dissipation The proposed damper is highspeed in installation and repairing process after experiencing a strong earthquake By using this damper inbeam to column moment connection plastic deformations can be prevented in the main structural elementssuch as beams and columns the proposed connection systems the stiffness strength and energy dissipationcapacity remains at an acceptable level with respect to conventional moment connections To ensure properbehavior of damper under cyclic loading an example of the damper is built and tested To determine thebehavior of the rubber layer in two of the experiments the damper has been built with no steel elementdissipator Also two specimens armed with steel yielding elements made of low carbon steel and stainlesssteel A304L under cyclic deformation has been tested In each case the damper response as force deformation curves are derived and presented Then to determine the behavior of proposed connection thisconnection system is simulated with ABAQUS and a parametric study is done In each finite elementssample moment drift and energy dissipation curves in the proposed system are presented It is shown that byusing the proposed connection system can be maintain the stiffness strength and ductility are maintained atthe desirable levels and the structure is prevented from seismic damage In addition good hysteresis behaviorand high speed in repairing provides a high potential for its use in design of steel structures Keyword passive energy dissipation visco plastic damper steel moment connection energy dissipation

بني شيخ الاسلامي، ابوالحسن

كنترل خسارت زلزله با استفاده از اتصالات خمشي مجهز به ميراگرهاي ويسكوپلاستيك

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