توصيفگر ها :
كاهش نيرو , ضريب اضافه مقاومت , معيار گسيختگي , معيار نهايي سازه , بارگذاري جانبي،قائم و زلزله , آناليز ديناميكي , روش تحليلي،رياضي و مركب , درصد صلبيت , آرماتور فلزي , آئين نامه 2800 , بادبندي هاي فولادي
چكيده انگليسي :
Abstract Nowadays concrete has found a particular situation in building industry as an initialmaterial with appropriate characteristics During the past decades with development of thereinforced concrete structures in the world and requirement of buildings construction inthe short time the usage of the precast concrete structure has been more significant One ofthe resisting systems against seismic loading in these buildings is steel bracing with directconnections predicated avance The reason is easy realization economic problems andmaking the windows in the braced bays in comparison with the bays with shear walls andalso the advantage of weight loss in this system However there are not sufficient informations about seismic behaviour of prec tconcrete structures with steel bracing Nowadays the most important part of seismicdesign of structures is carried out based on equivalent static method and calculation ofseismic forces from linear spectrum of an earthquake with application of a structuralreduction factor which contains the design philosophy The reduction factor is acoefficient that contains inelastic behaviour and shows hidden resistance and ductility ofstructures in the inelastic zone With attention of behaviour factor signification in structuralseismic design seemsthe determination of this factor is necessary The aim of this researchis to determine of behavoiur factor for the precast concrete frames braced by steelelements For this purpose the precast concrete frames with three bays have been used The bays width is equal to 6 meters and the story height is equal to 3 meters Some parameters like the number of stories 4 8 12 stories the rigidity percentageofframe precast connection of beam to column 0 25 50 75 and 100 the number ofbraced bays lor 2 bays the position of braced bays the effective stiffness coefficient forthe reinforced concrete members the lateral load pattern effects of eccentric bracing andevaluation of 3 dimensional frames on the reduction factor have been investigated therigidity percentage of zero stands for hinge connection and rigidity percentage of 100 stands for rigid connections and rigidity percentagesof 25 50 and 75 stands for semirigid connections To receive this goal the static pushover analyseshave been used V fI s I
