Various systems used in real time monitoring of high rise buildings and bridges

1. SysEng (s) Pte. Ltd
Real Time Structural
Monitoring System
(Hong Kong North East Tower)

4. Construction
Phases of a 420 m
High Tower Block in
the Region

5. Configuration
Level 33
RS485
Network
Level 53
RS485
Network
Level 65
RS485
Network
2.4 GHz
Highway
Central
monitoring
Station
SMS Alert
System

6. Construction at
Stage 1 of the
420 m Tower
Block
Level 33

7. Strain Gages and Displacement Sensors
Strain gage installation
with redundancy
On site
measurement system
Displacement
sensor

8. Monitoring Station at Construction Site

9. SysEng (s) Pte. Ltd
Real Time Structural
Monitoring System
(Marina Bay Sand Hotel Tower)

10. Cast-in VW Strain Gage
•To measure the vertical force
•from the superstructure
Welded VW Strain Gage
•To measure the
tension/compression force on the
support beam between the vertical
and slope core

11. x
L
x = Lsinθ
Where L is floor height
D
Ln-2Ln-1Ln
L1L3L2
Tilt meter
Proposed method for tower tilt measurement

12. Proposed installation location
Proposed installation location to form
a sensor array to detect tower
movement profile at the vertical core
and slope core

13. Total Lateral Displacement at level n
Xi = D + ∑ Li sin θi
D
Individual floor level lateral
displacement can be determined by
using
•Displacement sensor as the referencing datum
•Accumulated lateral movement resolved from
tilting angle detected by tilt meter
X i
X i
X i
X i
X i
X i
D
How to determine the lateral displacement

14. T3 East (slope) displacement
GL64 (30 Nov 09)
0
10
20
30
40
50
60
-30 -20 -10 0 10 20 30 40 50
mm
Level
T3 GL64
Expected
T3 E GL64
The expected lateral movement vs. the actual measured movement
The comparison between the
expected lateral movement (modeling)
and the actual lateral movement from
sensor array
• the movement profile is similar
•The maximum difference between the
actual and expected is 10mm

15. mid span
Cast-In Strain Gage
Cross section view
side view
Proposed installation location for
Embedded VWSG in
PT Beam

16. SysEng (s) Pte. Ltd
Human Comfort Measurement
(ORD Building)

17. Tower 1 Level 9 Human Foot Fall
Human Comfort test
for multi floor level for ORQ
Structure Human Comfort standard (ISO 2631) Testing Service

18. Building vibration noise level test
For multi floor level
(Office and M&E)

19. SysEng (s) Pte. Ltd
Long Term
Structure Health Monitoring
(Republic Plaza)
(The Sail)

20. a) Long Term Building Monitoring at
280 m Republic Plaza since 1995

21. Remote Monitoring of the 280m High
Republic Plaza
 Measures the Wind Load and Seismic
conditions experienced by the Building
 NTU conducts the Full Scale Research while
SysEng (S) designs and install the
Instrumentation
 The system operates automatically since 1995
 The system can be controlled remotely and
measured data are via modems

22. Transducers at Republic Plaza
 (Top) Ultra sonic
Anemometer to
measure Wind
Direction & Speed
 (Top & Bottom)
Servo
Accelerometers to
measure vibrations
 GPS receivers to
measure
displacements

23. Central Monitoring System
 16 Channels,16 bits,
Sample & Hold
 Multi-tasking for data
logging and file transfer
 6 hours UPS
 Operates continuously 24
hours
 Lightning and Voltage
surge protection

24. SysEng (s) Pte. Ltd
SysEng Server System for
Real Time Monitoring Service

26. Our real time monitoring systems track record

27. SysEng (s) Pte. Ltd
Measurement proposal for
Mumbai International Airport

28. Structure information
Project Facts
Project Area: 4,843,759 ft
Building Height: 45 m
Number of support pillar: 28
Number of Stories: 4

29. Proposal for
mega structure deflection measurement
Consideration
• To provide a direct measurement method for deflection movement
due to unbalance of loading during construction period
• To provide dynamic deflection info of the mega structure
• to provide an overview on all the 28 mega structure deflection info
in a single screen
• To provide an alert/ warning feature on loading activities when the
deflection is breaching the design limit
• Easy installation, minimize effect on the construction schedule
• On site standalone system, easy to maintain and operate

30. displacement
sensor
Side View
movement
vertical movement due to
unbalance loading
Proposal for
mega structure deflection measurement
•During installation of steel structure will cause a vertical deflection
of the top portion of the mega structure
•The installed vertical displacement sensor (V) will able to detect
the dynamic movement of the top portion of the mega structure
•The datum of the vertical displacement sensor is refer to the floor
level which is no direct link to the mega structure
V
H

31. Proposal for
mega structure deflection measurement
displacement
sensor
Plan View
sensor
measurement
system
pillar lateral movement
due to unbalance loading
movement
movement
H
V
V
H
•During installation of steel structure may cause a bending moment
n the pillar portion of the mega structure
•This bending moment will translate into horizontal deflection
•The installed horizontal displacement sensor (H) will able to detect
the dynamic movement of the bending moment of the mega
structure
•The datum of the horizontal displacement sensor is refer to the
floor level which is no direct link to the mega structure

32. Proposal for
mega structure deflection measurement
Central
Monitoring System
On-site Measurement
Station
Mega Structure #1
Mega Structure #28
•The On-site Measurement Station (MS) will collect all the dynamic
info and send it back to the Central Monitoring System (CMS)
•When receiving info from MS, the CMS will do:
•Check and analysis the data
•Display the info on the CMS display
•Send alert/ warning when info is breaching design limit
•Achieve data to database

33. SysEng (s) Pte. Ltd
Thank You