SysEng (s) Pte. Ltd

Real Time Structural

Monitoring System(Hong Kong North East Tower)

Construction

Phases of a 420 m

High Tower Block in

the Region

Configuration

Level 33

RS485

Network

Level 53

RS485

Network

Level 65

RS485

Network

2.4 GHz

Highway

Central

monitoring

Station

SMS Alert

System

Construction at

Stage 1 of the

420 m Tower

BlockLevel 33

Strain Gages and Displacement Sensors

Strain gage installation

with redundancy

On site

measurement systemDisplacement

sensor

Monitoring Station at Construction Site

SysEng (s) Pte. Ltd

Real Time Structural

Monitoring System(Marina Bay Sand Hotel Tower)

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

x

L

x = Lsinθ

Where L is floor height

D

Ln-2

Ln-1

Ln

L1

L3

L2

Tilt meter

Proposed method for tower tilt measurement

Proposed installation location

Proposed installation location to form

a sensor array to detect tower

movement profile at the vertical core

and slope core

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

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

mid span

Cast-In Strain Gage

Cross section view

side view

Proposed installation location for

Embedded VWSG in

PT Beam

SysEng (s) Pte. Ltd

Human Comfort Measurement (ORD Building)

Tower 1 Level 9 Human Foot Fall

Human Comfort test

for multi floor level for ORQ

Structure Human Comfort standard (ISO 2631) Testing Service

Building vibration noise level test

For multi floor level

(Office and M&E)

SysEng (s) Pte. Ltd

Long Term

Structure Health Monitoring (Republic Plaza)

(The Sail)

a) Long Term Building Monitoring at

280 m Republic Plaza since 1995

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

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

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

SysEng (s) Pte. Ltd

SysEng Server System for

Real Time Monitoring Service

Our real time monitoring systems track record

SysEng (s) Pte. Ltd

Measurement proposal for

Mumbai International Airport

Structure information

Project Facts

Project Area: 4,843,759 ft

Building Height: 45 m

Number of support pillar: 28

Number of Stories: 4

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

displacement

sensor

Side View

mo

vem

ent

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

VH

Proposal for

mega structure deflection measurement

displacement

sensor

Plan View

sensor

measurement

system

pillar lateral movement

due to unbalance loading

movement

mo

vem

ent

HV

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

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

SysEng (s) Pte. Ltd

Thank You