Shaking Table Test Of Seismic Pile-Soil-Structure Interaction

The seismic pile-soil-structure interaction (SPSSI) is the focus of geotechnical engineering and earthquake engineering, and is the important reseach topic for the economic development and seismic engineering of bridge. The current methods of pile seismic design are farily backward and are of shortcomings, and are lack of the verification of earthquakes and model tests. In the thesis, based on the seismic tests of pile foundations of Xiamen-Zhangzhou Bay Bridge, a series of scale model shaking table tests of pile in different soil were performed. This thesis has the goals of providing insight into mechamism of seismic pile-soil-structure interaction (SPSSI), the dynamic behaviors of pile in earthquake and the mechamism of pile damage in the earthquake and discussing the seismic design method of pile foundation applied in the project of Xiamen-Zhangzhou Bay Bridge.Taking into account the liquefaction, even serious liquefaction in the site of Xiamen-Zhangzhou Bay Bridge and the seismic design mothod of pile foundation that the m=0 in the liquefiable layer, a free field test (FF) and four 1/30 model pile shaking table tests, including the non-liquefiabe field test (NLF), liquefiable layer removed test (LLR), non-sandwich field test (NSF) and sandwich field test (SF), were performed in the research.In addtition, lots of data processing works are involved in the shaking table test, and validity of the research work is concerned directly by the efficency and quality of the data processing. Hence, in the thesis, taking the LLR for example, the thoughts and the process of data processing in MATLAB program are expounded, and the method of shaking table test data processing is generalized, which provides the experience for the further, same tests and build the foundation for the development of method of shaking table test data processing. Furthermore, the method of decomposing the frequency is suggested, which offers a concise, straightforward and effective method for analyzing the effect of inertial interaction and the kinematic interaction to the SPSSI and can serve as a reference for this type test.Consequently, the strain data of the LLR is analized deeply and in detail in this thesis. In the process of analyzing the LLR, the effect of inertial interaction and the kinematic interaction to the SPSSI is studied, applying the ideal of decomposing the frequency. The results show that, anyway, the moment respose of pile is always maily determined by the structural systerm, that is, the inertial interaction holds the leading position and the kinematic interaction contributes little in SPSSI under the small motion, the middle motion or strong motion; the siemic response of low frequency band affects the middle and lower part of pile more, while the seismic response of high frequency band affects the top part of pile more;The max moments are appeared at the pile cap or the interface of pile and soil.