Shaking table test research of single piles with towering structures
(2.School of Architecture and Material Engineering, Hubei University of Education, Wuhan, China 430000)
(3.College of civil Engineering and Architecture of Hainan University, Haikou, Hainan Province, China 570228)
【Abstract】The lateral seismic response of towering structures (wind turbines, bridges with high pier, et al.) is one of the main factors that influence the seismic stability, and it is meaningful to carry out the related research for the prevention and disaster mitigation of these structures. Lateral seismic response of pile foundations is studied in this paper based on the shaking table test of single pile. Firstly, the pre-event memory of acceleration data is used to identify the noise component and determine the frequency edges for filter. Then the acceleration response is compared with Gohl’s shaking table test, so as to illustrate the influence of superstructure on lateral seismic response. Then test data recorded by different sensors are used to calculate the same physical quantity in order to evaluate the quality of test data. After that, the dynamic p–y response of soil-pile is studied. The results show that (1) the pre-event memory can be used as frequency edges for filter combining with signal–to–noise ratio after FFT transformation; (2) the superstructure has a great effect on the lateral acceleration response. In contrast to Gohl’s test, the acceleration amplification coefficient is only 0.59 times, but the displacement response amplitude is 10.5 times; (3) the type of pile foundations and site conditions can influence the p–y response greatly. In contrast to Wilson’s test, the maximum lateral displacement of this test is 1/13 of it; (4) there exists a great stiffness difference at different side of the pile which has a negative effect on the stability of superstructures and is rarely mentioned in the test with usual superstructures.
【Keywords】 shaking table test; single pile; towering structure; lateral seismic response; seismic prevention;
(Translated by LIU T)
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