بررسی اثرات الاستیک هوا ناشی از باد
ترجمه نشده

بررسی اثرات الاستیک هوا ناشی از باد

عنوان فارسی مقاله: بررسی اثرات الاستیک هوا ناشی از باد بر ساختمانهای بلند توسط آزمون تونل بادی با استفاده از یک دستگاه لرزش اجباری دو محوری
عنوان انگلیسی مقاله: Investigation on wind-induced aero-elastic effects of tall buildings by wind tunnel test using a bi-axial forced vibration device
مجله/کنفرانس: سازه های مهندسی – Engineering Structures
رشته های تحصیلی مرتبط: مهندسی عمران
گرایش های تحصیلی مرتبط: سازه
کلمات کلیدی فارسی: ساختمان بلند، بار باد، لرزش اجباری دو محوری، اثر الاستیک هوا، لرزش ناشی از باد
کلمات کلیدی انگلیسی: Tall building، Wind load، Bi-axial forced vibration، Aero-elastic effect، Wind-induced vibration
نوع نگارش مقاله: مقاله پژوهشی (Research Article)
نمایه: Scopus – Master Journals List – JCR
شناسه دیجیتال (DOI): https://doi.org/10.1016/j.engstruct.2019.06.008
دانشگاه: School of Civil Engineering, Wuhan University, Wuhan 430072, PR China
ناشر: الزویر - Elsevier
نوع ارائه مقاله: ژورنال
نوع مقاله: ISI
سال انتشار مقاله: 2019
ایمپکت فاکتور: 3.604 در سال 2018
شاخص H_index: 114 در سال 2019
شاخص SJR: 1.628 در سال 2018
شناسه ISSN: 0141-0296
شاخص Quartile (چارک): Q1 در سال 2018
فرمت مقاله انگلیسی: PDF
تعداد صفحات مقاله انگلیسی: 11
وضعیت ترجمه: ترجمه نشده است
قیمت مقاله انگلیسی: رایگان
آیا این مقاله بیس است: خیر
آیا این مقاله مدل مفهومی دارد: ندارد
آیا این مقاله پرسشنامه دارد: ندارد
آیا این مقاله متغیر دارد: ندارد
کد محصول: E12438
رفرنس: دارای رفرنس در داخل متن و انتهای مقاله
فهرست انگلیسی مطالب

Abstract


1. Introduction


2. Tall building description


3. Wind tunnel test


4. Analysis of test data


5. Test results and analysis


6. Conclusions


Acknowledgments


References

نمونه متن انگلیسی مقاله

Abstract


Wind-induced vibrations of tall buildings certainly change wind effects on the structures, which is the so-called aero-elastic effect. To date, the approach to identify the aero-elastic effect is still sparse. In this paper, a bi-axial forced vibration device is developed to evaluate the aero-elastic effects of tall buildings via wind tunnel tests. The device can simulate the first-order bi-axial vibration of building models. Furthermore, the surface pressure and the top displacement of the oscillating model can be synchronously measured. The aerodynamic damping ratio and aerodynamic stiffness were identified through analyzing the aero-elastic force acting on the oscillating model. The effects of aero-elastic parameters on wind-induced responses and equivalent static wind loads of a 347 m tall building were examined and analyzed. The results show that for a return period of 100 years, the aerodynamic damping is positive while the aerodynamic stiffness is negative. Aerodynamic stiffness is much smaller than the structural stiffness and therefore it has a negligible effect on natural frequency of the building. Considering the aero-elastic effects, the maximum top displacement and acceleration decrease by approximately 4% and 10% respectively, and meanwhile, the base shear and base moment induced by equivalent static wind loads decrease by approximately 1%. This investigation indicates that wind tunnel test using such kind of biaxial forced vibration device is an effective approach to identify aero-elastic parameters of tall buildings and even other tall slender structures.


Introduction


The aerodynamic elastic effects induced by aero-elastic parameters, especially by aerodynamic damping ratio, should be considered when evaluating wind-induced responses of tall slender buildings with low frequency and damping ratio [1,2]. Currently, there are mainly two types of methods to investigate the aero-elastic effect by wind tunnel tests: the aero-elastic test [2–۷] and the forced vibration test [8–۱۱]. In the former method, the aerodynamic damping ratio is identified based on the random structural responses. The results from this method, however, are highly discrete. Moreover, the results identified by different technique are varied, and meanwhile, the identified results greatly depend on the selection of sample [1]. Compared with the aeroelastic wind tunnel tests, the forced vibration wind tunnel tests possess a number of advantages including large signal-to-noise ratio, simple recognition algorithm and high recognition stability [12]. In the late 1980s, Steckley [12] designed a pivot mode activator, based on which a pendulum model can perform harmonic vibrations around the bottom axis with a given frequency and amplitude. This device was the first one to be used to identify aerodynamic elastic parameters of tall buildings. The influence of the harmonic motion with different amplitudes and frequencies on aerodynamic force coefficients and spectra of tall buildings with a square section was analyzed by a multi-point pressure measurement wind tunnel test in Canada [9].

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