Moving ships and other objects drifting on water often impact a bridge’s pile foundations. The mechanical model of the piles-bridge structure under horizontal forcing was established, and a time-domain ap-proach based on Finite-difference Method was developed for analyzing the dynamic response of the piles-bridge structure. For a single pile, good agreement between two computed results validated the present approach. The slenderness ratio of the pile, the pile2soil stiffness ratio and the type of the structure influence the dynamic response of the piles2bridge structure. The computed results showed that the stiffness of the structure deter-mines the dynamic response of the piles2bridge structure under horizontal forcing.

建立了考虑桩土界面可以滑移、土体存在极限阻力的单桩分析模型，采用位移协调法分析了单桩的荷载传递特性。在此基础上，研究了桩顶荷载水平对两桩相互作用系数的影响，建立了考虑桩顶荷载水平的相互作用系数计算公式。并将上述方法应用于群桩的分析，获得了群桩的荷载沉降特性。本文提出的单桩和群桩弹塑性分析方法克服了目前应用较多的弹性理论法夸大桩土相互作用的缺点。单桩和群桩荷载沉降曲线的分析结果和实测数据吻合，说明了该方法的合理性。

提出了一种求解埋置于分层土中的框架结构受侧向瞬态荷载作用时的动力响应的简单方法。通过与其它方法比较可知，它具有良好的精度和稳定性。这种方法的桩周土模型采用Winkler假定，它将框架结构的各梁柱单元联结起来，从而求得整个结构的动力响应。通过动力分析评价了不同形式的框架结构的动力特性，参数研究揭示了框架结构的刚度、框架材料与土的刚度比、冲击力作用时间以及荷载作用位置等因素对框架结构横向振动的影响。由于它克服了传统的静力法不能考虑结构的惯性力以及土的粘滞阻尼和动刚度的缺点，因而具有更广泛的适用范围。

Based on the Winkler hypothesis, a model for analysis of the flexural response of an ocean trestle embedded in layered soil to horizontal impact of a moving mass is developed. By use of the transfer matrix in time domain, one can calculate the flexural dynamic response of a single pile. Then, by use of the boundary conditions of piles at the pile top, the dynamic re-sponse of the structure is analyzed. By use of the model proposed in this paper, the interactive force between the moving mass and the structure can be computed based on Work's kinetic energy theorem and Newton iterative method. Thus the ap-proach does not have to assume the interactive force, while the traditional method have to. The approach more accords with the engineering practice than the traditional method and it is convenient for engineering design.

提出一种桩基质量的模糊评定方法，该方法的特点是：用类比法对非定量因素定量化，建立隶属函数；根据各因素之间的重要性，用层次分析（AHP）法确定因素权重；采用加权平均模型作为综合评判模型；用非对称贴近度法划分桩基质量等级；并结合工程实例进行验证分析。