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Screw displacement pile shaft deformations measured by vibrating wire and fiber optic systems during a static load test
Abstract
This paper describes a full scale static load test performed on a 400 mm diameter screw displacement pile equipped with four different strain measuring systems. Three types of vibrating wire strain gauges (VWSG) were used: global - retrievable, local attached to steel pipe and local concrete embedded. The fourth system was distributed fiber optic sensors based on Rayleigh back scattering (DFOS) - three in the pile cross section. It is generally assumed that the combined cross section deforms equally. However, especially in the upper part of the pile, stress and therefore strain distribution might be non-uniform. In the case of steel tube (installed centrally in the pile axis), additional sliding effect may occur. Pile bending and local shaft imperfection may also affect strain readings, therefore using multiple gauges in a single plane might be necessary for proper result interpretation. Those assumptions were verified in the paper as the differences in readings have significant influence on final load distribution interpretation. Adaptation of several strain measurement techniques in one test allowed their applicability assessment and effectiveness verification.
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- Category:
- Conference activity
- Type:
- publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
- Language:
- English
- Publication year:
- 2022
- Bibliographic description:
- Wiszniewski M., Krasiński A.: Screw displacement pile shaft deformations measured by vibrating wire and fiber optic systems during a static load test// / : , 2022,
- Sources of funding:
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- COST_FREE
- Verified by:
- Gdańsk University of Technology
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