【摘要】 结合在钱塘江盐官河段对涌潮作用下桩式丁坝动力特性进行的现场测试,首次将有限差分法应用于求解桩式丁坝框架结构受涌潮瞬态荷载作用时的动力响应。其桩周土模型采用Winkler假定,应用有限差分法将桩式丁坝框架结构的各梁柱单元离散后联立起来,从而求得整个结构的动力响应。通过参数研究揭示了结构的形式、结构的刚度、土的剪切波速(即反映桩土相对刚度)对桩式丁坝框架结构横向振动的影响。通过与现场测试结果比较可知,理论计算值与实测值基本吻合,验证了该方法的精度和稳定性。该方法计算过程简单,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,对工程实际具有一定的指导意义。更多还原

【Abstract】 Following the field test of transversal dynamic characteristics of pile groins due to bores in the Yanguan reach of the Qian-tang river,finite difference method was used for the dynamic response analysis of the sheet-pile groin frame structure under transient excitation due to tidal bores at the first time.Adopting Winkler model for soils,the dynamic response of the whole structure was obtained by means of finite difference method.Parameter studies revealed the influences of the structural style,the rigidity of the structure and the shearing wave velocity(reflecting the pile-soil stiffness ratio).Good agreement between the field test and the theoretical analysis validates the present approach.The traditional static method could not consider the inertial force of the structure,the dynamic stiffness and the viscous damping of the soil.The present approach overcomes above disadvantages,and has a simple calculation process,therefore,the conclusions may be meaningful to engineering practice to a certain extent.更多还原