Chat with us, powered by LiveChat

Careers | Training | Resource!!!

arrow_back_ios

Main Menu

See All Products See All Knowledge See All Services & Support See All Solutions See All About See All Contact Us See All Demo See All Load cells title
arrow_back_ios

Main Menu

See All Acoustic End-of-Line Test Systems See All DAQ and instruments See All Electroacoustic application See All Software See All Transducers See All Vibration Testing Equipment See All Electroacousticsb - OLD unpublished See All Academy See All Resource Center See All Services See All Support See All Applications See All Industries See All Our Business
arrow_back_ios

Main Menu

See All Actuators See All Combustion Engines See All Durability See All eDrive See All Transmission Gearboxes See All Turbo Charger See All DAQ systems See All High precision and calibration systems See All Industrial electronics See All Power Analyser See All S&V Handheld devices See All S&V Signal conditioner See All Accessories for electroacoustic application See All DAQ See All Drivers API See All nCode - Durability and Fatigue Analysis See All ReliaSoft - Reliability Analysis and Management See All Test Data Management See All Utility See All Vibration Control See All Acoustic See All Current / voltage See All Displacement See All Load cells See All Pressure See All Strain Gauges See All Torque See All Vibration See All Temperature See All LDS Shaker Systems See All Power Amplifiers See All Vibration Controllers See All Accessories for modal exciters See All Test Solutions See All Training Courses See All Primers and Handbooks See All Calibration See All Installation, Maintenance & Repair See All Support Brüel & Kjær See All Acoustics See All Asset & Process Monitoring See All Electric Power See All NVH See All OEM Custom Sensors See All Structural Integrity See All Vibration See All Automotive & Ground Transportation See All Business Ethics
arrow_back_ios

Main Menu

See All CANHEAD See All GenHS See All LAN-XI See All MGCplus See All Optical Interrogators See All QuantumX See All SomatXR See All Fusion-LN See All Accessories for industrial electronics See All Handheld Software See All Accessories for S&V handheld devices See All BK Connect / PULSE See All API See All Microphone sets See All Microphone Cartridges See All Acoustic calibrators See All Special microphones See All Microphone Pre-amplifiers See All Sound Sources See All Accessories for acoustic transducers See All Experimental testing See All Transducer Manufacturing (OEM) See All Accessories for strain gauges See All Non-rotating (calibration) See All Rotating See All CCLD (IEPE) accelerometer See All Charge accelerometer See All Impulse hammers / impedance heads See All Cables See All Accessories See All Calibration Services for Transducers See All Calibration Services for Handheld Instruments See All Calibration Services for Instruments & DAQ See All Resources See All Electroacoustics See All Environmental Noise See All Noise Source Identification See All Product Noise See All Sound Power and Sound Pressure See All Vehicle Pass-by Noise See All Production Testing and Quality Assurance See All Machine Analysis and Diagnostics See All Structural Health Monitoring See All High Voltage See All OEM Sensors for the Agriculture Industry See All OEM Sensors for Robotics and Torque Applications See All Structural Dynamics See All Material Properties Testing

HBM’s measurements show: The carrying capacity of the Holmenbrua bridge in Norway is weakened

Holmenbrua: Analyzing the carrying capacity

Increased traffic volume, increased challenges

The load that today’s traffic inflicts on Holmenbrua in Drammen is much higher than what was originally predicted when the bridge was built in the early 1960’s. Due to a significant increase in traffic volume, examinations of the bridge’s construction was initiated to determine if it could withstand the burden it was exposed to or whether improvements were needed. To analyze the impact the increased traffic volume had on Holmenbrua’s construction, HBM was assigned by Rambøll Norge to conduct the necessary measurements on a given area of the underside of the bridge using strain gauges. The strain gauges were attached to five longitudinal steel rods, or rebars, to log tension and compression in the material by the passing of a truck weighing 50 ton. For full exposure of the rebars and to get the best utilization of the strain gauges possible, a part of the concrete around the rebars was removed. “It was essential that the surface of material where we attached the strain gauges was treated” says Herman Lingefelt, project engineer at HBM. “We do this to make sure the strain gauges provide the correct measurements. Even wrong coarseness on the surface can result in the glue not transmitting the strain of steel correctly. In this case, we had to grind away the rust and then brush with sandpaper. It may seem  simple, but it requires a lot of practical know-how.” The strain gauges were adjusted to the environment in which they were to operate in, taking into consideration temperature variations in the area. This was so that they would follow the natural expansion and compression in the material caused by temperature. Because Holmenbrua is located in a moist environment, HBM also used a coating over the measuring points to prevent the gauges from losing their grip due to rust or short circuits in the steel.

Weakened carrying capacity

The results of the measurements were consistent with the deflection the bridge experienced and, based on the measurements made by HBM, Rambøll concluded that the bridge’s capacity was so weakened, that reduced weight limits were recommended. “Measurements like these are very important to uncover security implications that increased load may have on the material in a construction, and shows how important it is to use reliable measurement techniques. Exact knowledge of the bridge's condition is essential for municipal and transport managers,” says Bjarne Hauge of HBM Norway. Rambøll is satisfied with HBM’s cooperation: ”Using one supplier to conduct the measurements was efficient and saved us time. The work HBM did on Holmenbrua was conducted in a precise and accurate way, and we are very pleased with our cooperation”, says Jon Halden at Rambøll Norge.

Related products

No more result to load

The Customer

Rambøll Norge

Modern Slavery Statement     Imprint    Cookie Policy    Privacy Policy    Sitemap    Ethical Business

 

© 2025 Hottinger Brüel & Kjær

 

 

close
nCode logo
Graphics Brand

We haved moved ${referer} to www.hbkworld.com

 

This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.

close
ReliaSoft-Logo-webp
Graphics Brand

We haved moved ${referer} to www.hbkworld.com

 

This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.

close
Prenscia HBM-Logo rgb
Graphics Brand

We haved moved ${referer} to www.hbkworld.com

 

This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.

close
HBM-Logo blue rgb
Graphics Brand

We haved moved ${referer} to www.hbkworld.com

 

This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.

close
logo of Brüel & Kjær (BKSV), experts of sound and vibration measurements from HBK
Graphics Brand

We haved moved ${referer} to www.hbkworld.com

 

This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.