r - The Hong Kong Polytechnic University

青 衣
Tsing Yi
昂 船 洲
Stonecutters
昂 船 洲 大 桥
Stonecutters
Bridge
at North &
South Side
4W
3W
2W
1W
藍 巴 勒 海 峽
Rambler Channel
North
SCB Location Plan
SEGMENT NO.32
South
Sensor Location :
Sensor Tag-Name :
Deck Level
Deck32_N+Deck32N_S - FDAU
Channel
2/s4 /Hz)
Date of time-series data collected: 2011-03-24
Duration: 10:39:00 to 14:39:00 (4 hours)
Duration per frame = 30 mins
Time Reference of Time-Series
Data Collected :
Duration of Time-Series
Acceleration Data Analyzed :
Location of Time-Series Data
Collected :
Date: 2011-03-24 Time Started:
10:39:00
Time Ended: 14:39:00
4 Hours
Chainage : 42+6390 Mid Main Span
Deck Segment No. 32
Vertical (Z) Power Spectrum (m
Type of Window for Data
Hanning Window
Sampling :
Data Ov erlapping :
50%
Duration of 1 Frame :
30 Minutes
Sampling Rate :
102.4 Hz
Number of Data Points Per Data 184,320
Frame :
Number of Data Frames
15
Considered :
Data Filtering :
De-trendi ng
Frequency Resolution (= Ite m 8 / 0.000555556 Hz
Item 9) :
Method of Acceleration Data Fast Fourier Transform (FFT)
Analysis :
Method of Frequencies
Extraction :
Power Spectrum with Peak-Picking
Mean Wind Speed on Deck-Level : 2.05 m/s (10-Minute Mean)
Mean Air Temperature / Mean
Steel Temperature :
16.4 Deg. C / 17.5 Deg. C
Analysed
Frequency (Hz)
Measured
Frequency (Hz)
A01
M01
A03
A02 A04
M02
M03
M04
A05
M05
A07 A08
A13 A15
A06 A09 A10 A11 A12 A14 A16
M06
M07
M08
M09
M10
M11
M12
A17 A18 A19
M13
A20
M14
A21 A23
A22
M15
Mean Relative Humidity :
Software Tools :
Name of Acceleration Data
Logger Used :
98.4 %
MATLAB Signal Processing &
Analysis
TMB-FDAU (16-Bi t Sequential Data
Logger)
Figure 38 Vertical Flexural Deck Frequencies Extraction by Power Spectrum
青 衣
Tsing Yi
昂 船 洲 大 桥
Stonecutters
Bridge
at North &
South Side
昂 船 洲
Stonecutter
s
4W
3W
2W
1W
藍 巴 勒 海 峽
Rambler Channel
North
SCB Location Plan
Sensor Location :
Deck Level
SEGMENT NO.32
South
Sensor Tag-Name :
Time Reference of Time-Series
Data Collected :
Deck32_N+Deck32N_S - FDAU
Channel
Date: 2011-03-24 Time Started:
10:39:00
Time Ended: 14:39:00
Duration of Time-Series
Acceleration Data Analyzed :
4 Hours
Location of Time-Series Data
Collected :
Chainage : 42+6390 Mid Main Span
Deck Segment No. 32
Type of Window for Data
Sampling :
Hanning Window
Data Ov erlapping :
50%
Duration of 1 Frame :
30 Minutes
Sampling Rate :
102.4 Hz
Number of Data Points Per Data
Frame :
184,320
Number of Data Frames
Considered :
15
Data Filtering :
De-trendi ng
Frequency Resolution (= Ite m 8 /
Item 9) :
0.000555556 Hz
Method of Acceleration Data
Analysis :
Fast Fourier Transform (FFT)
Method of Frequencies Extraction : Power Spectrum with Peak-Picking
Mean Wind Speed on Deck-Level : 2.05 m/s (10-Minute Mean)
Mean Air Temperature / Mean
Steel Temperature :
Mean Relative Humidity :
Software Tools :
16.4 Deg. C / 17.5 Deg. C
98.4 %
MATLAB Signal Processing &
Analysis
Name of Acceleration Data Logger TMB-FDAU (16-Bi t Sequential Data
Used :
Logger)
Figure 39 Comparison of Measured and Analyzed Vertical Flexural Deck Frequencies
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