【摘要】 桩基础的动力计算是桩基动力学中非常复杂而又极为重要的课题之一,国内外研究得还不很完善。本文根据粘弹性波动理论建立了有回填土影响时考虑桩一土一基础相互作用时桩基础在水平—摇摆耦合振动作用下的动力计算方法,提出了桩基础体系的动力刚度与阻尼表达式和动力反应计算公式;提供了软土地区有效桩长的确定方法和设计曲线。理论计算与原位测试分析表明,本文方法所得计算结果比现有方法更接近于实测值。最后并指出了用M.Novak方法得出的结果与国内外试验资料并不符合。更多还原

【Abstract】 In this paper, based on viscoelastic theory, a set of formulae for evaluating the dynamic response of an embedded machinery foundation supported on piles subjected to coupled sliding and rocking vibration is presented. The design curves are also given to define the effective pile length which depends on the dynamic behavior of subsoil as well as the exciting frequency. It has been found that the effects of embedment and piles to the dynamic response of a pile-supported machinery foundation can be neglected under the condition that the exciting frequency is more than 30 Hz. The analysis shows that the present approach is found to be rather close to the field tests than those obtained by the current methods, such as on the basis of mass-spring theory and elastic half-space theory.更多还原