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Structural Health Monitoring-Bridge Bearingss

With the new procedure for the permanent monitoring by the acousto-elastical stress measurement changes in the structures can be recognized in time into civil engineerings. The world-wide only on-line procedure permits the measurement of loads and stress situations directly in the building. With ultrasonic the stress in the building directly and in real time is seized. All changes can be transferred immediately on-line by Internet or radio. The sensors are brought either directly into the building or later attached to endangered places. Design features such as carriers or bridge bearings can be supervised particularly simply. The sensors are constantly at or active in the building. The simple structure and the small size permit comprehensive application at all buildings from steel or concrete. Into all engineering structures can be measured static loads and tensions and small dynamic changes. In the procedure many important civil engineerings could be supervised world-wide. The costs of such a monitoring are small. The collapse of buildings accompanies with a measurable change of the tensions and loads. These are correlated with the world-wide available stove data of seismic events and examined for plausibility. Thus also a monitoring of buildings of all kinds on damage is possible by disasters (earthquake, ground slips, mudslide etc.).

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Structural Health Monitoring-Bridge Bearingss

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  1. Acousto-elastical stress measurement-a new procedure for the geotechnical on-line monitoring fmj@ibj-technology.com F.-M. Jäger IBJ Technology Ingenieurbüro Jäger 1

  2. Acousto-elastical stress measurement-which is that ? Transmitter Reciver ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ Ultrasonic Ping the running time is measured IBJ Technology Ingenieurbüro Jäger 2 Acousto-elastical stress measurement

  3. Acousto-elastical stress measurement-which is that ? Transmitter Reciver Stress or load ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ Ultrasonic Ping the running time is measured the new running time is smaller IBJ Technology Ingenieurbüro Jäger 3 Acousto-elastical stress measurement

  4. 1 Physical fundamentals higher stress causes higher speed the ultrasonic longitudinal wave • Cl = Speed of sound • = Poisson's ratio P = Density E = Young's modulus (modulus of elasticity) IBJ Technology Ingenieurbüro Jäger 4 Acousto-elastical stress measurement

  5. Acousto-elastical effect Stress PING SPEED TIME IBJ Technology Ingenieurbüro Jäger 5 Acousto-elastical stress measurement

  6. acousto-elastical effect Stress PING SPEED 50°K Heating up Run time increase 10,6‰ IBJ Technology Ingenieurbüro Jäger 6 Acousto-elastical stress measurement

  7. acousto-thermal effect Stress PING SPEED 50°K Heating up Run time increase 10,6‰ IBJ Technology Ingenieurbüro Jäger 7 Acousto-elastical stress measurement

  8. The solution for the sensor Measurement of the running time + temperature The ultimate solution for digital acousto-elastical Sensors TDC = Time -to-Digital Converter Dimension 5 x 5 Millimeters 1-channel double resolution with typ. 45 ps Up to 1 million measurements per second IBJ Technology Ingenieurbüro Jäger 8 Acousto-elastical stress measurement

  9. The solution for the sensor TDC = Time -to-Digital Converter Measurement of the running time + temperature The ultimate solution for digital acousto-elastical Sensors • 1-channel double resolution with typ. 45 ps • Up to 1 million measurements per second • Dimension 5 x 5 Millimeters IBJ Technology Ingenieurbüro Jäger 9 Acousto-elastical stress measurement

  10. The solution for the sensor TDC = Time -to-Digital Converter Measurement of the running time + temperature The ultimate solution for digital acousto-elastical Sensors • 1-channel double resolution with typ. 45 ps • Up to 1 million measurements per second • Dimension 5 x 5 Millimeters example IBJ Technology Ingenieurbüro Jäger 10 Acousto-elastical stress measurement

  11. running time 2 Sensitivy and factors of influence 3150 µs Sensor thickness 10 mm running time change as function of the temperature 3050 µs temperature -26°C +80C IBJ Technology Ingenieurbüro Jäger 11 Acousto-elastical stress measurement

  12. 2 Sensitivy and factors of influence Runn time as function of the stress Sensor thickness 25 mm the end of the sensor is 1 Giga Pa 1 x 103 N/mm2 Runn time ⇒ 3050 µs 80°C 26°C Stress IBJ Technology Ingenieurbüro Jäger 12 Acousto-elastical stress measurement

  13. 2 Sensitivy and factors of influence Speed of the ultrasonic wave as function of the stress ⇒ Speed ⇒ Stress ⇒ 3050 µs C 26°C Independently of sensor thickness IBJ Technology Ingenieurbüro Jäger 13 Acousto-elastical stress measurement

  14. 3 Measurement under the hydraulic press C equipment hydraulic press, concrede body and elastomeric bearing IBJ Technology Ingenieurbüro Jäger 14 Acousto-elastical stress measurement

  15. 3 Measurement under the hydraulic press Stress concentration over the sensor C IBJ Technology Ingenieurbüro Jäger 15 Acousto-elastical stress measurement

  16. 3 Measurement under the hydraulic press Data Aqusition System DASYLab 9 C experimental setup DASYLab 9 computation “sigma is” IBJ Technology Ingenieurbüro Jäger 16 Acousto-elastical stress measurement

  17. 3 Measurement under the hydraulic press Methods of the sensor assembly primary bedding in the concrete secondary put in boreholes / embed into expansive cement C experimental loads setting IBJ Technology Ingenieurbüro Jäger 17 Acousto-elastical stress measurement

  18. 4 Field measurement at a building of the federal motorway the sensor installation into Boreholes 25 mm diameter stress sensor BBS_10_DS C IBJ Technology Ingenieurbüro Jäger 18 Acousto-elastical stress measurement

  19. 4 Field measurement at a building of the federal motorway Measurement of the running time with ultrasonic material testing set C Measuring box with TDC IBJ Technology Ingenieurbüro Jäger 19 Acousto-elastical stress measurement

  20. 4 Field measurement at a building of the federal motorway ⇒ running time ⇒ sigma / stress ⇒ temperature ⇒ sensor-serialnumber Screen of the Windows program for the measurement sigma determination (stress) C Measurement equipment IBJ Technology Ingenieurbüro Jäger 20 Acousto-elastical stress measurement

  21. 4 Field measurement at a building of the federal motorway object of the measurement BAB 9, Munich-Berlin ⇒ C IBJ Technology Ingenieurbüro Jäger 21 Acousto-elastical stress measurement

  22. 4 Field measurement at a building of the federal motorway object of the measurement BAB 9, Munich-Berlin ⇒ C IBJ Technology Ingenieurbüro Jäger 22 Acousto-elastical stress measurement

  23. 4 Field measurement at a building of the federal motorway object of the measurement ⇒ C IBJ Technology Ingenieurbüro Jäger 23 Acousto-elastical stress measurement

  24. 4 Field measurement at a building of the federal motorway object of the measurement ⇒ 27 reinforced elastomeric bearings ⇒ C IBJ Technology Ingenieurbüro Jäger 24 Acousto-elastical stress measurement

  25. 4 Field measurement at a building of the federal motorway object of the measurement Cross section of the bridge 27 reinforced elastomeric bearings Reinforced elastomeric bearing ⇒ ° ° ° 27 acusto- elastical sensors sensor 1 sensor 2 sensor 3 C IBJ Technology Ingenieurbüro Jäger 25 Acousto-elastical stress measurement

  26. 4 Field measurement at a building of the federal motorway hydraulic lifting C IBJ Technology Ingenieurbüro Jäger 26 Acousto-elastical stress measurement

  27. 4 Field measurement at a building of the federal motorway ⇒ ⇒ Bore hole for the sensor C IBJ Technology Ingenieurbüro Jäger 27 Acousto-elastical stress measurement

  28. 4 Field measurement at a building of the federal motorway ⇒ ⇒ Preparatory hole C IBJ Technology Ingenieurbüro Jäger 28 Acousto-elastical stress measurement

  29. 4 Field measurement at a building of the federal motorway Sensor inserted C IBJ Technology Ingenieurbüro Jäger 29 Acousto-elastical stress measurement

  30. 4 Field measurement at a building of the federal motorway secondary mounting / embed intoshrink-free mortal Sensor C IBJ Technology Ingenieurbüro Jäger 30 Acousto-elastical stress measurement

  31. 4 Field measurement at a building of the federal motorway Elastomeric bearing assigned C IBJ Technology Ingenieurbüro Jäger 31 Acousto-elastical stress measurement

  32. 4 Field measurement at a building of the federal motorway after hydraulic sinking the first measurement under load C IBJ Technology Ingenieurbüro Jäger 32 Acousto-elastical stress measurement

  33. 4 Field measurement at a building of the federal motorway bridges on the elastomer bearings hydraulics cylinder dismounts C IBJ Technology Ingenieurbüro Jäger 33 Acousto-elastical stress measurement

  34. 4 Field measurement at a building of the federal motorway sensor-lines up eastward C IBJ Technology Ingenieurbüro Jäger 34 Acousto-elastical stress measurement

  35. 4 Field measurement at a building of the federal motorway sensor-lines up to the west C IBJ Technology Ingenieurbüro Jäger 35 Acousto-elastical stress measurement

  36. 4 Field measurement at a building of the federal motorway all sensors inserted mobile measurement or permanently everything a question of the costs ⇒ ⇒ ⇒ ⇒ C IBJ Technology Ingenieurbüro Jäger 36 Acousto-elastical stress measurement

  37. 5 Results of measurement C IBJ Technology Ingenieurbüro Jäger 37 Acousto-elastical stress measurement

  38. 5 Results of measurement traffic load change 40 N/mm2 30 N/mm2 20 N/mm2 Dynamic load measurement bearing 20 IBJ Technology Ingenieurbüro Jäger 38 Acousto-elastical stress measurement

  39. 5 Results of measurement traffic load change 40 N/mm2 30 N/mm2 20 N/mm2 . . . . . . .10 secunds Dynamic load measurement bearing 20 4 measurements/sec; the new TDC more than 1000 are time faster IBJ Technology Ingenieurbüro Jäger 39 Acousto-elastical stress measurement

  40. advantage of the acousto-elastical stress measurement: 6 View on applications • Low cost on-line measurement • Practically indestructibly • No measuring range delimitation upward • Measurement in the heap of debris and fracturing zone • Measurement in the water • Inexpensive lost probe IBJ Technology Ingenieurbüro Jäger 40 Acousto-elastical stress measurement

  41. 6 View on applications Rock stress measurement Frac with expansive cements IBJ Technology Ingenieurbüro Jäger 41 Acousto-elastical stress measurement

  42. 6 View on applications IBJ Technology Ingenieurbüro Jäger 42 Acousto-elastical stress measurement

  43. 6 View on applications IBJ Technology Ingenieurbüro Jäger 43 Acousto-elastical stress measurement

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