terratek integrity monitoring of structures

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Terratek carries out dynamic loading tests on structures usingadvanced vibration analysis techniques and state-of-the art

elec tronics. The tests are totally non-destructive and non-

intrusive.

The equipment used to take measurements is a very sensitive 24-bit vibration recorder. It is so accurate that is able to measuredisplacements o the order of magnitude of the wavelength oflight. Therefore there os no need to induce artificial vibrations, aswe measure the response due to ambient loading like wind,traffic, waves or temperature.

This technology has been successfully applied to many structures,

including bridges, steel tower, tall buildings, dams, harbour and

offshore structures.

Dynamic monitoring of structures

Dynamic load testing of structures

Terratek

Av rico Verssimo 901 / 30222621-180 Rio de J aneiro, RJ,

Braziltel 21 2486 3386Contact Dr Beto [email protected]

In Brasil:

Rio de janeiro

Belo Horizonte,

Overseas:

Caracas, Venezuela

Lima, Peru

Kuala Lum ur, Malsia

Small sized vibration recorder

Standard

Measurements and analyses follow the following Standard:

ABNT NBR 15307 Non-destructive testing Dynamic loading

testing on large structures Procedure

The scope of the Pias system is to analyse structural integrity, by

chec king stresses and strains in the whole structural system,

detecting:

o Global structural integrity

o Location and extend of damage;

o Structural behaviour under additional loading;

o Degradation, aging and structural life span.

24-bit Vibration recorder

Scope of measurements

Visit our website: www.terratek.com.br


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Projects

Terratek has successfully tested the following range of structures:

Mosquito RailwayBridge

Harbour structures, TubaroHarbour

Conveyor beltand ship loader

Dynamicloading testof jetty anddolphinstructure

Bridge integrityassessment

Safety check of the

roof of football stadium

200 m high TVtower, Braslia

Offshorestructures

Bridge integrity assessment, BR101 motorway, Brazil

Damage detection on aconcrete dam


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Damage detection on Arealdam

Pias

Amplitude %

0 5 10 15 20 25

Damping

(x10-3)

0

1

2

3

4

5

6

MR

0 1 2 3 4

-9

-8

-7

-6

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-4

Frequenc y (Hz)

PSD Amplitude (g2/Hz x 10-6)

Spectrum Damping

Vibration spectrum and damping

Vibration measurements with time on a structure enable to obtain spectra and damping,by proper mathematical analyses. These data are the bac kbone for understandingstructural behaviour and the effect of damage and aging.

Miningstructures:crushers, Millsand scrubberbuilding


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Mathematical modelling

The next step is to build a dynamic mathematical model of the structure through astructural dynamics software. Initially the model outputs the undamaged behaviour.Then, structural damage is simulated on a trial and error process until the structure outputsresonance frequencies that match with the measurements. At this stage the model iscalibrated and its behaviour matches the actual structure. Then, the mathematicalmodel can be used to check the behaviour under an type of loading.

Curitiba

So Paulo

P1

P2

P3

P4P5

P6

P7

P8

Y

Conveyor belt showingdynamic instability on a slender

column

Damage detection on highwaybridge

Transverse instability duringtrain passage, MosquitoBridge


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Damage level

Dynamic loading tests give the overall damage level of a structure. This information will beused by decision makers and the structural designer to decide on the extend of

rehabilitation works.

Votorantim MiningRPM Kinross Mining

Highway Dept BrazilCVRD Vale do Rio Doce Mining CompanySeebla Consulting Engineering, So PauloRPeotta Harbour Engineering, Rio de J aneiroTecnosonda SA, Rio de J aneiroSonda Engineering Ltd, BrasliaNovacap Braslia

On-line real time vibration measurements

Terratek carries out continous on-line structural monitoring. This enables a continuouscheck on damage level and structural aging. In this case, vibration monitors are fixedon selected structural members on the structure and linked to the internet. Acomputer program analyses vibration data, yielding spectra, velocities, displacementsand damping.

Clients

terratek integrity monitoring of structures

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