板桩丁坝在瞬态横向冲击作用下的动力响应分析
Analytical study on dynamic responses of sheet-pile groin subjected to transient lateral impulse
摘要：
近年来，为了抵抗涌潮的冲击，提出了一种由排桩和系板组成的新型板桩丁坝结构。然而，对结构在涌潮作用下的动力响应问题，以往的研究还不够深入。本文提出了板桩丁坝在瞬态横向激励下动力响应的解析解。为了考虑纵向和弯曲振动，桩和板分别采用一维杆和梁理论进行模拟。桩周土采用动力温克勒地基模型模拟。激励被认为是一个横向集中点荷载作用在前面的桩。在此基础上，在时域内建立控制方程，在频域内求解，最后利用离散逆傅立叶变换得到时域响应。通过与有限元模拟和模型试验结果的比较，验证了解析解的准确性。通过参数分析，研究了板、桩和土的性质对动力响应的影响。
英文摘要：
A novel structure of sheet-pile groin consists of row piles and tied sheet has been introduced to resist the impact of tidal bore in recent years. However, the dynamic responses of the structure under tidal bore have not been carefully studied before. This paper proposed an analytical solution for the dynamic responses of the sheet-pile groin subjected to a transient lateral excitation. In order to take the flexural and longitudinal vibrations into consideration, the piles and the sheet are modeled by the Timoshenko beam (TB) theory and a one-dimensional rod, respectively. The soil around the piles is simulated by the dynamic Winkler foundation model. The excitation is considered by a lateral concentrated point load acting on the front pile. On this basis, the governing equations are constructed in time domain and solved in frequency domain, while the time-domain responses are finally obtained using the discrete Inverse Fourier Transform. The accuracy of the presented analytical solution is validated by comparing with the results obtained from the FEM simulation and a model test. The effects of properties of the sheet, the piles and the soil on the dynamic responses are investigated through a comprehensive parametric study.
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