【摘要】 从高桩承台基础等效体系和原型基本周期相等的原理出发,采用弹性地基反力法考虑桩-土相互作用,通过幂级数法求解侧向荷载下桩的挠曲微分方程,提出了一种求解高桩承台基础在侧向荷载作用下等效嵌固长度的解析方法;分析了土层、桩径与桩距比、桩柱抗推刚度比等参数对桩基础等效嵌固长度的影响规律,并给出了具有实用性的高桩承台桩基等效嵌固长度简化公式。结果表明:土层性质和桩、柱抗推刚度比是决定高桩承台桩基础等效嵌固长度的主要因素;研究成果可简化群桩基础模型,同时兼顾上部结构响应的精度,为桥梁概念设计提供依据。更多还原

【Abstract】 Calculation model of equivalent anchorage length for elevated pile caps under lateral load was proposed based on the invariability of basic period.Pile-soil interaction was considered by elastic subgrade reaction method and using the power series method to solve the curve differential equation.Variety rules of anchorage length for elevated pile caps with the changes of soil properties,diameter-spacing ratio of pile,pile-pier stiffness ratio etc were studied.The empirical equation of pile equivalent fixed length for elevated pile caps under lateral load was given.The main factors affecting the equivalent anchorage length of pile consist of soil properties and pile-pier stiffness ratio.So this study can provide a simplified model for pile group foundation which could simplify calculation and guarantee the calculation precision,the research results can be used for conceptual design of bridges.1 tab,7 figs,14 refs.更多还原