中文摘要：

采用FLAC3D有限差分软件,建立了斜直交替群桩-土-桥梁结构的动力相互作用特性分析模型,通过数值计算,分别得到了桩身弯矩、桥墩与桥梁结构的位移以及桩体受力特性的变化规律,并将所得结果与全直桩群桩-土-桥梁结构的动力特性进行对比分析.研究结果表明：斜直交替群桩中的斜桩相对其直桩和全直桩群桩的桩身最大弯矩减小约15％.振动结束后,斜直交替群桩的桥墩与桥梁结构具有残留水平位移,全直桩群桩的桥墩与桥梁结构不存在残留水平位移,斜直交替群桩中的斜桩最大水平力沿桩身呈线性变化,两种模型直桩的最大水平力沿桩身变化均不明显.

英文摘要：

The dynamic characteristics analysis model of inclined straight alternating pile group-soil bridge structure was established by means of finite difference software FLAC：~D. Through numerical calculation, the change laws of the bending moments of piles, the displacements of bridge pier and bridge structure as well as the stress characteris- tics were obtained. Then the data were compared with the dynamic interaction characteristics of straight pile group- soil-bridge structure. The results show that the maximum bending moments of inclined piles in inclined straight alternating pile group decrease by about 15 ~ relative to that of straight piles. When the vibration finishes,the bridge pier and bridge structure supported by inclined straight alternating pile group have residual horizontal displacements, but the bridge pier and bridge structure supported by straight pile group have no residual horizontal displacements. The maximum horizontal forces along the inclined pile of inclined straight alternating pile group are linear,and the changes of maximum horizontal force along the straight pile of two models are not obvious.