Experimental Investigation on Seismic Resonance Behavior of Pile Foundation Structures Under Scouring Condition


Abstract eng:
Dynamic response mechanism of soil-pile-structure system (SPSS) is a complicated problem in the field of earthquake engineering. To this end, a series of shake table tests were carried out to investigate the seismic resonance behavior of SPSS. A reinforced concrete (RC) specimen comprised of a lumped mass representing the superstructure, a single pier, and a cap supported by a 2×2 pile group was constructed and embedded into unitary dry sand. First the dynamic properties of SPSS were investigated using white noise input. In order to excite resonance response of each fundamental vibration modes, three sinusoidal waves with the same peak acceleration of 0.1g with frequencies of 2Hz, 7Hz and 15Hz were utilized. To represent the scouring phenomena, which is common for the foundation of bridges over waterways, soil layers were removed. The acceleration response of the structure and sand, as well as curvature of pier and foundation, were detected. The results showed that the SPSS has three fundamental vibration modes, which are dominated by the motion of superstructure, pile-cap and soil layers, respectively. Due to the resonance effect between earthquake input and certain vibration modes, seismic response of SPSS varied significantly when the frequency of the dynamic loading changed. This underlines the importance of studying the careful selection of ground motion inputs for seismic design of bridges that have the possibility of a scoured foundation.

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Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 4628.:
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