桩底约束条件对弧形排桩-连系梁内力影响研究  

Study on the Effect of Different Constraint Condition at Pile Bottom on Internal Force Distribution of Arc Row Piles with Arc Coupling Beam

作　　者：张志伟[1] 邓荣贵[1] 王振永[1] 钟志彬[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《重庆交通大学学报（自然科学版）》2015年第4期81-86,共6页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(41272321);高等学校博士学科点专项科研基金项目(20120184110023)

摘　　要：弧形排桩-连系梁抗滑结构为多次超静定结构,将桩顶弧形连系梁计算模型简化为无铰拱,视抗滑桩与弧形连系梁之间的约束力为冗力,利用桩顶与弧形连系梁之间的变形协调条件,建立了抗滑结构的整体柔度方程;在桩底自由、铰支及固定等3种不同桩底约束条件下,分别求解桩梁之间的约束冗力,比较了3种桩底约束条件下弧形连系梁的内力,及抗滑桩的内力和位移。研究表明:桩底固定时,桩底部弯矩较大;桩底自由时,弯矩明显减小,桩身位移增加;在桩顶连系梁的约束下,减小桩身锚固段长度,能够减小桩身底部弯矩的影响规律。The model for arc coupling beam can be simplified as hingeless arch,according to the high order statically indeterminate characteristics of the spatial anti-slide structure,with the redundant forces between beam and pile top,by using deformation compatibility to set up flexibility equation of new spatial anti-slide structure. Based on the different constraint conditions such as freedom,hinge and fixation at the pile bottom to solve the redundant forces,then calculate and compare the internal force of arc coupling beam and the internal force and displacement of pile among the different constraint conditions at the pile bottom,and the influence law of internal force and displacement by different constraint conditions was obtained. That the moment at the bottom of pile is larger as fixed,but reduce obviously as free and displacement increase. By the constraint of coupling beam,shortening the length of anchoring section can reduce the moment at the bottom of pile.

关 键 词：岩土工程 抗滑结构 弧形排桩 弧形连系梁 桩底约束 内力分布 

分 类 号：TU753.3[建筑科学—建筑技术科学]