کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6754719 | 509536 | 2016 | 23 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effect of prestress force magnitude and eccentricity on the natural bending frequencies of uncracked prestressed concrete beams
ترجمه فارسی عنوان
اثر نیروی پیشدستی و بیحرکتی بر فرکانس های خمشی طبیعی تیرهای بتنی پیش رونده نشده
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کلمات کلیدی
خروجی تنها تجزیه و تحلیل مودال تجربی، بتن پس از کشیدگی، مدلسازی رگرسیون خطی، فرکانس خمیدگی پایه، آزمون خمشی 3 نقطه،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی عمران و سازه
چکیده انگلیسی
This paper describes the outcome of static 3-point bending testing and output-only experimental modal analysis on 9 post-tensioned concrete beams. Static 3-point bending testing and dynamic impact testing were conducted on each of the 9 beams at different levels of post-tensioning force. The Fast Fourier Transform (FFT) was implemented on the dynamic accelerometer impact data, and the fundamental frequencies of the simply supported post-tensioned concrete beams were determined by a peak-picking algorithm at each post-tensioning load level. The tests were repeated 10 times at each impact location to ensure repeatability of the experiment. There were 3 impact locations per post-tensioning load level, and there were 11 post-tensioning load levels at which the beams were tested. A first-order linear regression model was then applied to the measured fundamental bending frequencies with increasing post-tensioning load. Statistical significance tests were subsequently conducted on the recorded data to determine if any statistically significant changes in fundamental bending frequency with increasing post-tensioning load was observed, for both static and dynamic results. The results obtained for the static 3-point bending tests were then compared and contrasted with the results obtained from dynamic testing. No statistically significant relationship between natural frequency and post-tensioning load level was found for these uncracked concrete beams.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Sound and Vibration - Volume 365, 17 March 2016, Pages 22-44
Journal: Journal of Sound and Vibration - Volume 365, 17 March 2016, Pages 22-44
نویسندگان
Darragh Noble, Maria Nogal, Alan O׳Connor, Vikram Pakrashi,