SHM is commonly required for new bridges:

• To provide real-time alerts for unplanned events. These include weather-related incidents (high wind, extreme temperature), earthquakes, overloaded vehicles or impacts from vehicles/ships.
• To record utilisation of key elements, (eg bearings, expansion joints) so that replacement/ intervention can be planned based on the asset’s specific requirements. 
• To monitor aspects that have been problematic in earlier bridge designs, for instance steel deck fatigue or foundation settlement
• To provide long-term bridge performance information. For example, this helps to understand whether a bridge is behaving as designed and whether it will continue to do so.

SHM for existing bridges is usually required in response to a known or suspected problem:

• Actual defects: When defects are found during inspections, such as cracking or evidence of bearing faults
• Vulnerable details: When vulnerable details are suspected in cases where the condition is not easy to check through inspections, for instance the deterioration of post-tensioned concrete structures or concrete half joints, or other hidden defects
• Load carrying capacity: When a bridge fails its numerical assessment

It can also be used as a cost-effective and safer alternative to ongoing periodic manual monitoring of certain defects, with the added benefit of providing a full and consistent data record.

JF Strainstall is independent of equipment manufacturers. Our skill is in knowing which technology to use for each application.

Typical measurements include displacement, deflection, strain, acceleration (vibration), inclination (tilt), settlement, temperature, weather (wind speed, wind direction, pressure, relative humidity, rainfall, sunshine, visibility).

JF Strainstall also deploys third party systems (GNSS, Automatic Total Station, RC Corrosion, Dynamic Weigh-in-Motion, Acoustic Emission Monitoring) and integrates the data in its SAMS™ platform, so that users have one interface to be able to access all data from multiple monitoring hardware systems and even across multiple bridges. All analysis and reports are produced and accessed from the same interface.

JF Strainstall has brought many innovations to the bridge monitoring world, including sensor technologies and data management and visualisation. The latest involves an InnovateUK funded research project (with partners), ‘SmartBridge’, a digital twin combining finite element analysis and deterioration models with SHM.

Monitoring Systems

James Fisher Strainstall is independent of equipment manufacturers. Our skill is in knowing which technology to use for each application.

Typical measurements include displacement, deflection, strain, acceleration (vibration), inclination (tilt), settlement, temperature, weather (wind speed, wind direction, pressure, relative humidity, rainfall, sunshine, visibility).

JFS also deploys third party systems (GNSS, Automatic Total Station, RC Corrosion, Dynamic Weigh-in-Motion, Acoustic Emission Monitoring) and integrates the data in its SAMS™ platform, so that users have one interface to be able to access all data from multiple monitoring hardware systems and even across multiple bridges. All analysis and reports are produced and accessed from the same interface.