r - The Hong Kong Polytechnic University

Bridge-Deck
Alignment
A6
A5
A4
D
A3
A2
A1
Bridge-Deck
Alignment
Longitudinal Acceleration of Tower =
Lateral Acceleration of Tower =
Torsional Acceleration of Tower =
Vertical Acceleration of Tower =
A
1
+ A 4
2
A
2
+ A 5
2
TAN-1
A
2
- A
5
D
A
3
+ A 6
2
(when the data is
significant)
A i = Acceleration time-history data record where i = 1, 2, 3, 4, 5, and 6.
Note: All 3D-Accelerometers at a deck section must be installed in the same vertical plane.
Figure 22 Arrangement of Accelerometers in Tower Section
Type of
Input Data
Type of Data
Processing
Type of Data
Classification
Type of Data
Analysis
Type of Derived
Parameters
Type of Plots
Vertical
Acceleration
Data
Linear
Spectrum
Analysis
Vertical Flexural
Deck Modes
Acc-F(3D)
at one or
more
Sections
Eigen
Analyzed
Results
TMU-1
TMU-2
TMU-3
TMU-4
TMU-6
TMU-7
Ane (U3D)
Ane (U2D)
Data Editing
Acceleration
Data Arithmetic
Processing
Selection of
Data at the same
time period as
the acceleration
data considered
Data Editing &
Classification
Lateral
Acceleration
Data
Torsional
Acceleration
Data
Longitudinal
Acceleration
Data
Steel
Deck-Section
Temperature
Concrete
Deck-Section
Temperature
Concrete
Tower-Section
Temperature
Asphalt
Pavement
Temperature
Air
Temperature
Curve
Fitting
Analysis
Power
Spectrum
Analysis
Coherence
Spectrum
Analysis
Time-Averaging
Statistics
Analysis
Lateral Flexural
Deck Modes
Torsional Flexural
Deck Modes
Longitudinal
Flexural Deck Modes
Lateral Flexural
Tower Modes
Torsional Flexural
Tower Modes
Longitudinal
Flexural Tower Modes
Maximum, Mean,
Minimum, Standard
Deviation, etc.
Time-Series Plots of All Raw
& Processed Data
Linear Spectrum Diagrams
(Real-Part)
Linear Spectrum Diagrams
(Imaginary-Part)
Power Spectrum Diagrams
(with Frequencies Extraction
by Peak-Picking)
Coherence Spectrum Diagrams
(between 2 Sections)
Mode Shapes Determination
(by Curve Fitting of the Peaks
of the Imaginary Part of the
Frequency Response Function)
Comparison Plots of Measured
Frequencies and Analyzed
Frequencies (by Finite Element
Analysis – either ANSYS /
Multiphysics or MD/NASTRAN)
Temperature References in
Steel Deck-Section, Concrete
Deck-Section, Concrete
Tower-Section, Asphalt
Pavement and Air
Wind References at
Deck-Levels and Tower-Tops
Deck &
Tower Winds
Figure 23 Flow Diagram of Customized Software Tools for Global Dynamic Features Monitoring
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