کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6893398 | 1445561 | 2017 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A Simplified Nonlinear Model of Vertical Vortex-Induced Force on Box Decks for Predicting Stable Amplitudes of Vortex-Induced Vibrations
ترجمه فارسی عنوان
یک مدل غیر خطی ساده شده نیروی تحریک گردابی عمودی در جعبه های جعبه برای پیش بینی آماری های پایدار از ارتعاشات ناشی از گرداب
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کلمات کلیدی
عرشه جعبه پل ارتعاش ناشی از چرخش عمودی، نیروی ناشی از چرخش عمودی، مدل غیر خطی ساده شده، آزمون تونل باد، مدل مقطعی در مقیاس بزرگ، اندازه گیری همزمان نیرو و ارتعاش،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی کامپیوتر
علوم کامپیوتر (عمومی)
چکیده انگلیسی
Wind-tunnel tests of a large-scale sectional model with synchronous measurements of force and vibration responses were carried out to investigate the nonlinear behaviors of vertical vortex-induced forces (VIFs) on three typical box decks (i.e., fully closed box, centrally slotted box, and semi-closed box). The mechanisms of the onset, development, and self-limiting phenomenon of the vertical vortex-induced vibration (VIV) were also explored by analyzing the energy evolution of different vertical VIF components and their contributions to the vertical VIV responses. The results show that the nonlinear components of the vertical VIF often differ from deck to deck; the most important components of the vertical VIF, governing the stable amplitudes of the vertical VIV responses, are the linear and cubic components of velocity contained in the self-excited aerodynamic damping forces. The former provides a constant negative damping ratio to the vibration system and is thus the essential power driving the development of the VIV amplitude, while the latter provides a positive damping ratio proportional to the square of the vibration velocity and is actually the inherent factor making the VIV amplitude self-limiting. On these bases, a universal simplified nonlinear mathematical model of the vertical VIF on box decks of bridges is presented and verified in this paper; it can be used to predict the stable amplitudes of the vertical VIV of long-span bridges with satisfactory accuracy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering - Volume 3, Issue 6, December 2017, Pages 854-862
Journal: Engineering - Volume 3, Issue 6, December 2017, Pages 854-862
نویسندگان
Le-Dong Zhu, Xiao-Liang Meng, Lin-Qing Du, Ming-Chang Ding,