كليدواژه :
پل , خرپا , مهاربند كمانش تاب , بتن مسلح , نگارش , تحليل تاريخچه زماني غير خطي
چكيده فارسي :
متصل نمودن دو برج توسط يك پل مياني مي تواند يكي از راهكارهاي كنترل جابجايي و هم چنين استهلاك انرژي به حساب آيد. اين مقاله به بررسي انواع نيازهاي انرژي در سازه ساختمان بلند 40 و 60 طبقه مي پردازد كه در هر كدام از آنها دو هسته بتن مسلح با ارتفاع يكسان توسط يك پل خرپايي به يكديگر متصل شده اند. خرپاي پل از المان هاي كمانش تاب تشكيل مي شود. در ابتدا اين سازه با بكارگيري روش تحليل طيفي طبق آيين نامه هاي معتبر طراحي مي شود و در ادامه با تهيه مدل غيرخطي سازه در نرم افزار PERFORM-3D و انجام تحليل تاريخچه زماني تحت اثر زلزله هاي دور و نزديك انرژي ورودي، انرژي جنبشي، انرژي ميرايي و انرژي غيرالاستيك مورد بررسي قرار مي گيرد و مشاركت ديوار و پل در اتلاف انرژي مطالعه مي شود. دو رويكرد مفصل يگانه و مفصل گسترده براي هسته در نظر گرفته مي شود. در رويكرد مفصل يگانه، فقط در پاي هسته بتن مسلح اجازه مفصل پلاستيك داده مي شود و بقيه نواحي هسته بتن مسلح به صورت الاستيك مدل مي شود و تحليل تاريخچه زماني غيرخطي انجام مي شود. در رويكرد مفصل گسترده، كل هسته قابليت گسترش پلاستيسيته را دارد. بطور متوسط در رويكرد مفصل گسترده، سهم هسته ها حدود 48 درصد و سهم پل با اعضاي كمانش تاب حدود 52 درصد از انرژي غيرالاستيك تحت كل نگاشت هاي اعمال شده را شامل مي شود و اين اعداد در رويكرد مفصل يگانه به ترتيب حدود 34 و 66 درصد است.
چكيده لاتين :
The efficiency of the RC core system in buildings that are taller than 35 to 40 story is modestly reduced. In these structures, connecting two towers with a bridge can be considered as one of the solutions for controlling displacement and also energy dissipation. This paper examines the types of energy needs in high-rise buildings of 40 and 60 floors, each of which has two reinforced concrete core of the same height with a truss bridge. The trusses of the bridge are made by buckling restrained elements. Initially, this structure is designed using the response spectrum analysis method according to the valid codes. This paper examines the types of energy needs in high-rise buildings of 40 and 60 floors, each of which has two reinforced concrete core of the same height with a truss bridge. The trusses of the bridge are made by buckling restrained elements. Initially, this structure is designed using the response spectrum analysis method according to the valid codes. Then, by constructing a non-linear model of the structure in the PERFORM-3D software and performing a time history analysis subjected to the near and far fault ground motions, kinetic energy, input energy, damping energy, and non-elastic energy are studied, and the contribution of the wall and bridge is studied in energy dissipation. Single plastic hinge and extended plastic hinge approaches are considered for the core. In a single plastic hinge approach, only a plastic joint is allowed at the bottom of the RC core, and the rest of the RC core regions are elastic, and nonlinear time histories analysis is done. In an extended plastic hinge approach, the entire core has the ability to expand plasticity. On average, in extended plastic hinge approach the core share is about 48%, and the share of the bridge with buckling restrained members is about 52% in term of non-elastic energy, and these values are 34% and 66% in the single plastic hinge approach. Then, by constructing a non-linear model of the structure in the PERFORM-3D software and performing a time history analysis subjected to the near and far fault ground motions, kinetic energy, input energy, damping energy, and non-elastic energy are studied, and the contribution of the wall and bridge is studied in energy dissipation. Single plastic hinge and extended plastic hinge approaches are considered for the core. In a single plastic hinge approach, only a plastic joint is allowed at the bottom of the RC core, and the rest of the RC core regions are elastic, and nonlinear time histories analysis is done. In an extended plastic hinge approach, the entire core has the ability to expand plasticity. On average, in extended plastic hinge approach the core share is about 48%, and the share of the bridge with buckling restrained members is about 52% in term of non-elastic energy, and these values are 34% and 66% in the single plastic hinge approach. Studied structures, connecting two towers with a bridge can be as one of the solutions for controlling displacement and also energy dissipation.
