A CLOSED FORM SOLUTION FOR FREE VIBRATION ANALYSIS OF TUBE-IN-TUBE SYSTEMS IN TALL BUILDINGS
محل انتشار: ماهنامه بین المللی مهندسی، دوره: 25، شماره: 2
سال انتشار: 1390
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 1,025
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شناسه ملی سند علمی:
JR_IJE-25-2_001
تاریخ نمایه سازی: 17 خرداد 1393
چکیده مقاله:
In this paper the dynamic response of tube-in-tube systems for tall building structures is investigated. Inner and outer tubes are modeled using equivalent continuous orthotropic membranes; inwhich, each tube is individually modeled by a cantilever box beam. By applying the compatibilityconditions on deformation of the two tubes, the governing dynamic equations of the tube-in-tubestructure and their associated boundary conditions are derived using the variational principle of virtualwork. Appling differential calculus with some simplifications, and deriving non-trivial solution of these equations, a closed form solution is presented to obtain natural frequency and mode shape of tube-intube structures. A quick estimate of these quantities is of particular importance at the early stages of tube-in-tube systems design prior to a full dynamic analysis. In order to illustrate the efficiency of the proposed model a symmetrical building is analyzed and comparisons are made with more accurate results obtained by three dimensional computer dynamic analysis and previous published methods
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نویسندگان
m Malekinejad
Department of Civil Engineering, Shahid Bahonar University of Kerman, Kerman, Iran
r Rahgozar
Department of Civil Engineering, Shahid Bahonar University of Kerman, Kerman, IranCorresponding Author