水平荷载下单桩动力反应分析  

Dynamic response analysis for a single pile subjected to lateral load ing

作　　者：胡安峰[1] 谢康和[1] 肖志荣[2] 

机构地区：[1]浙江大学岩土工程研究所,浙江杭州310027 [2]浙江科技学院土木工程系,浙江杭州310012

出　　处：《浙江大学学报（工学版）》2003年第4期420-425,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(59895410).

摘　　要：基于动力Winkler模型(BDWF)对粘弹性地基中有限长桩和无限长桩的动力响应进行求解,采用与频率相关的弹簧系数和阻尼系数,得到了各种边界条件下的解析解.为了对有限长桩和无限长桩的动力特性进行比较,对最大无量纲响应沿深度的变化曲线进行了参数研究.分析结果表明,桩土模量比是动力响应中最重要的参数,并且在大多数情况下,当桩的长径比大于15时,有限长桩和无限长桩的内力和位移之间差别都很小,甚至可以把有限长桩当作无限长桩来近似处理,并且计算结果足够精确.The Beam-on-Dynamic-Winkler-Foundation (BDWF) model was utilized to determine the lateral dynamic responses of a finitely long pile and an infinitely long pile in a viscoelastic subgrade. The analytical solutions for different boundary conditions were developed based on the frequency-dependent springs and dashpots. To compare the dynamic behavior of a finitely long pile with that of an infinitely long one, a comprehensive parameter study was conducted on the dimensionless maximum response along the depth. The results show that the ratio of the Young's modulus of the pile to that of the soil is the important parameter in the dynamic response, and that in most cases, the difference of displacement and internal force between a finitely long pile and an infinitely long pile is so small that the analysis result of an infinite pile can be used as that of a finite one with enough accuracy, if the ratio of pile length to pile diameter exceeds 15.

关 键 词：单桩 动力反应 水平荷载 动力Winkler模型 有限长桩 无限长桩 动力响应 粘弹性地基 

分 类 号：TU473.12[建筑科学—结构工程]