Fig. 1. Installation procedure of large-circular-steel-pipe (Ssenyondo et al., 2017)
Fig. 2. Schematic diagram of wheatstone bridge circuit
Fig. 3. Measurement system
Fig. 4. Schematic diagram of small-scaled circular steel pipe installed in soil tank
Fig. 5. Normalized strain according to gauge location at different water levels
Fig. 6. Frequency response for microtremor measured using strain gauge at 2.5 cm location with water level of 25 cm
Fig. 7. Frequency response of strain gauge for water level of 25 cm
Fig. 8. Frequency response of strain gauge for water level of 40 cm
Fig. 9. Frequency response of strain gauge for water level of 55 cm
Fig. 10. Frequency response of strain gauge for water level of 70 cm
Fig. 11. Normalized acceleration signals according to different water levels
Fig. 12. Frequency response for microtremor measured using accelerometer
Fig. 13. Frequency response of accelerometer after hammer impacting
Fig. 14. Maximum frequency according to water level
참고문헌
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