r - The Hong Kong Polytechnic University

D 3
D 1
D 2
D 6
D 4
D 5
B
Vertical Displacement =
Lateral Displacement =
Torsional Displacement = TAN -1
Longitudinal Displacement =
D3 + D6
2
D2 + S5
2
| D3 −D6|
B
D1 + D4
2
D i
Note: All GPS at a deck section must be installed in the same vertical plane.
= Direction of time-series GPS data, where i = 1, 2, 3, 4, 5, 7 & 6.
Figure 26 Arrangement of GPS in Steel Deck Section
Type of
Input Data
Type of Data
Processing
Type of Data
Classification
Type of Data
Analysis
Type of Derived
Parameters
Type of Plots
GPS,
Til
Influence
Lines
Analyzed
Results
Correction of
Abrupt Changes
Spikes & Noises
Removal
Displacement
Data
Classification
Deck at ¼
Main Span
Deck at ½
Main Span
Deck at ¾
Main Span
Tower at
1 H
Tower at
2/3 H
Tower at
1/3 H
Tower at
0/3 H
Upper Piers
Time-Averaging
Statistics
Analysis
Curve Fitting
Analysis of
Deck & Tower
Profiles
Displacement
Input Type
Finite Element
Analysis
Displacement
Influence Lines
Validation
in Load Trials
Hourly, Daily, Monthly
Yearly Variations of
Displacements at
GPS and Til
Instrumented Sections
Deformed Line-Profiles
of Deck and Towers
Global Bridge
Deformed Shape with
Strain and Stress
Contours
Derived Stresses at
Dynamic Strain
Instrumented
Steel Deck Sections
Derived Stresses at
Static Strain
Instrumented
Tower-Base and
Pier-Base Sections
Time-Series Plots of All Raw
& Processed Data
Deformed Line-Profiles of
Deck and Towers
Global Bridge Deformed
Shape with Strain and Stress
Contours Illustration
Derived Stress/Force Outputs
at Each Dynamic Strain
Instrumented Deck Sections
or Pre-defined Key Locations
Derived Stress/Force Outputs
at Each Static Strain
Instrumented Tower & Pier
Sections or Pre-defined
Key Locations
(under Strong Lateral Loads)
Plots of Measured & Analyzed
Displacement Influence Lines
at GPS Instrumented
Deck & Tower Sections
Ane (U3D)
Ane (U2D)
Ane (P2D)
TMU-6
D-Str
S-Str
Acc-F(3D)
Selection of
Data at the same
Time period as
the GPS & Til
data considered
Data Editing &
Classification
Deck &
Tower Winds
Air
Temperature
Dynamic &
Static Strains
Deck
Accelerations
Tower
Accelerations
Time-Averaging
Statistics
Analysis
Correlation of
Measured & Analyzed
Displacement
Influence Lines at
GPS instrumented
Deck & Tower Sections
Maximum, Mean,
Minimum, Standard
Deviation, etc.
Comparison Plots of
Derived Stresses &
Measured Stresses
Wind References at
Deck-Levels & Tower-Tops
Acceleration References at
Deck & Tower Sections
Temperature References
in Air
Figure 27 Flow Diagram of Customized Software Tools for Displacements Monitoring
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