تعیین موقعیت بهینه مهاربازویی و کمربند خرپایی در سازه های بلند مرتبه با سطح مقطع غیر یکنواخت

نوع مقاله: مقاله عمران

نویسندگان

1 دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته کرمان

2 دانشگاه شهید باهنر کرمان

چکیده

در این مقاله، محل بهینه سیستم مهار بازویی و کمربند خرپایی در ارتفاع سازه های بلند با سیستم ترکیبی قاب محیطی و هسته مرکزی همراه با مهار بازویی و کمربند خرپایی با احتساب تغییرات ممان اینرسی قاب محیطی در ارتفاع مورد بررسی قرار گرفته است. سازه قاب محیطی و هسته مرکزی بر اساس روش پیوسته با یک تیر طره با مقطع قوطی شکل مدل شده است. اثر مهار بازویی و کمربند خرپایی بر روی هسته مرکزی به صورت فنر پیچشی در محل قرارگیری سیستم مهار بازویی و کمربند خرپایی در ارتفاع سازه در نظر گرفته شده است. با استفاده از قضایای لنگر سطح و اصل رویهم گذاری، روابطی جهت محاسبه تغییر شکلهای سازه بدست آمده و سپس با در نظر گرفتن انرژی سیستم معادل بر اساس تغییر شکلهای بدست آمده، موقعیت بهینه مهار بازویی و کمربند خرپایی در سازه بلند تحت بار گسترده مثلثی بر اساس حداکثر نمودن انرژی جذب شده توسط فنر معادل، محاسبه شده است. در نهایت گرافی جهت تعیین موقعیت بهینه مهار بازویی و کمربند خرپایی با احتساب تغییرات ممان اینرسی قاب محیطی تحت بار گسترده مثلثی پیشنهاد شده است. صحت و کارایی روش پیشنهادی با استفاده از یک مثال عددی و مقایسه با روش های ارائه شده توسط سایر محققین و همچنین نتایج حاصل از آنالیز کامپیوتری نرم افزار SAP2000 بررسی شده است. نتایج بیانگر دقت قابل قبول روش پیشنهادی می باشد که بر اساس نتایج بدست آمده، موقعیت بهینه، در محدوده میانی ارتفاع سازه قرار دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Determination Optimum Location of Outrigger and Belt Truss System in Tall Buildings with Non-Uniform Cross Section

نویسندگان [English]

  • Hamid Raeisi 1
  • Mohsen Malekinejad 1
  • Reza Rahgozar 2
چکیده [English]

 In this paper, optimum location of outrigger and belt truss system of tall structures with combined system of framed tube, shear core, outrigger and belt truss with non-uniform cross section of frame tube system along the height of structure is investigated. Framed tube and shear core under lateral loads are modeled as a cantilevered beam with box cross section using continuum approach. Effects of outrigger and belt truss systems shear core is modeled as a rotational spring placed at the location of belt truss and outrigger system. Relations for calculating deformations of the equivalent structure are obtained using moment area and superposition theories. Then, considering total energy of the system based on obtained relation of deformations and maximizing absorbed energy by equivalent spring, the optimum location of outrigger and belt truss in tall structures under triangularly distributed loads along structure’s height is obtained. In addition, the graphs are presented for different moment of inertia of frame tube system that can be used for determining optimum location of belt truss and outrigger system. Accuracy and efficiency of the proposed method is investigated by a numerical example and comparing the results with those obtained by computer analysis and other researchers. The results show that the proposed method reasonably accurate and optimum location is middle height of the structure.

کلیدواژه‌ها [English]

  • Tall Structure
  • Frame Tube
  • Shear Core
  • Outrigger and Belt Truss
  • Non-Uniform Cross Section
  • Optimum Location
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