联结式排桩隔振系统及其数值模拟

发布时间：2018-11-07 11:29

【摘要】：在低频入射波作用下,传统的自由式排桩结构的隔振效果并不理想。基于此,提出了一种新型的排桩隔振结构,即联结式排桩,并建立了数值模型对其隔振效果进行数值模拟。为了建立联结式排桩的隔振计算模型,利用序列Fourier变换及边界元方法,建立了波数域内桩土耦合的边界元模型。基于上述边界元模型,利用桩顶和梁端的联结条件,波数域内的周期性条件及上部联结梁的传递矩阵,建立了波数域内联结式排桩的计算模型。对排桩波数域内的解进行序列Fourier逆变换,即得空间域内排桩的解。基于所建立的模型,本文研究了在圆形载荷作用下,单排及双排联结式排桩的隔振效果。数值结果表明,联结式排桩的隔振效果要明显优于自由式排桩,因此,联结式排桩是一种更为有效的隔振设施。
[Abstract]:Under the action of low frequency incident wave, the isolation effect of the traditional free pile structure is not ideal. Based on this, a new type of vibration isolation structure with row piles is proposed, that is, the connected pile row structure, and the numerical model is established to simulate the vibration isolation effect of the structure. In order to establish the vibration isolation model of coupled piles, the boundary element model of pile-soil coupling in wavenumber domain is established by using the sequential Fourier transform and the boundary element method. Based on the above boundary element model, using the connection condition between the top and the end of the pile, the periodic condition in the wavenumber domain and the transfer matrix of the upper connecting beam, the calculation model of the connecting pile row in the wavenumber domain is established. The solution in the wavenumber domain of the row pile is transformed by the sequence Fourier inverse transformation, that is, the solution of the pile row in the space domain is obtained. Based on the established model, the vibration isolation effect of single row and double row connection piles under circular load is studied in this paper. The numerical results show that the vibration isolation effect of the connected piles is better than that of the free type piles, so the connected piles are a more effective vibration isolation device.
【作者单位】：江苏大学土木工程与力学学院;
【基金】：国家自然科学基金项目(51078171)
【分类号】：TU473

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