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STRUCTURAL HEALTH EVALUATIONS AND MONITORING

Ambient vibration tests allow for an in-depth analysis of structures.

Our structural testing method is non-destructive and rapid and can provide crucial information pertaining to the structure. Using our highly sensitive Larzé sensors and 3D-SAM software, the frequencies, mode shapes and damping ratios can be extracted and determined directly from a physical, on-site test. This kind of testing has the following benefits:

  • Short-test times (1 day)

  • Temporary testing without the need for permanent instrumentation

  • Only simple building dimensions and elevations needed

  • No need to create detailed finite-element models

  • Test conducted under operational conditions of the structure

The process gives an in-depth look at the structure at that point in time and can be used in conjunction with previous and future tests to monitor change in structural properties over time. This can be used to calibrate numerical models, find hidden defects within the structure or used to periodically monitor the structure's health as it ages or if damage occurs.

This service was used on the following featured projects :

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Simplified

Baseline

   •   Simplified ambient vibration test

   •   Derivation of main modes, natural frequencies, mode

       shapes and damping ratios

   •   This test creates a baseline that may be used for

       future comparisons and structural health monitoring

   •   Obtained data can be used to calibrate finite element

       models, increasing their reliability and creating

       more cost-efficient retrofit schemes

Complete

Baseline

   •   Accurate natural frequency derivation

   •   Mode shape rendering and damping ratio derivation

   •   Accurate derivation of higher modes and torsional

       modes of irregular structures

   •   This test creates a baseline that may be used for

       future comparisons and structural health monitoring

   •   Detailed report of findings by our team of experts

   •   Obtained data can be used to calibrate finite element

       models, increasing their reliability and creating

       more cost-efficient retrofit schemes

Non-destructive Condition Assessments

Our technology can be applied to highly specific project needs:

   •   Assessing in-plane flexibility of building floors and

       roofs

   •   Specialized analysis for specific structural

       components such as joints to understand the true

       behaviour of the structure

   •   Identify integrity discontinuity within structures or

       between structural blocks

    •  Evaluating the required net-gap between

       structural blocks to mitigate the seismic impact

       hazard

   •   Lateral stiffness derivation per story

   •   Detection of soft-stories

   •   Find resonance frequencies of floors and

       machinery to mitigate excessive floor vibrations

   •   Modal analysis of walls for blast-tests

Periodic

Monitoring

After an in-depth baseline test, complete or simplified tests are done every few months, after a natural disaster, after retrofitting or during standard visual inspections. These can be compared to the initial conditions to view any unseen changes in the structure's integrity, and  to detect damage.

• Complete: Full-service tests examining the

                   frequency, mode shapes and                           modal curvature

• Simplified: Quick tests solely monitoring

                   structural frequency at a

                   reduced, competitive price

Permanent

Monitoring

Permanent structural health monitoring solutions using our ShakeLog System can detect damage and assess integrity over time by monitoring the following:

• Simplified threshold alarms

• Structural frequency

 

• Deriving mode shapes

• Modal curvature comparisons

• Structural drift computation

• Feeding data into external or pre-existing

  systems

• Custom sensing parameters

Contact us today for more information on how we can help your projects

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