桥梁转体承台受力性能有限元分析  

Finite Element Analysis of Force Performance of Bridge Rotating Bearing Platform

作　　者：辛乐清 XIN Leqing(China Railway 14^(th) Bureau Group No.4 Engineering Co.Ltd.,Jinan Shandong 250002,China)

机构地区：[1]中铁十四局集团第四工程有限公司,山东济南250002

出　　处：《铁道建筑技术》2023年第4期105-107,125,共4页Railway Construction Technology

基　　金：山东省技术创新项目(202250101276)。

摘　　要：为研究大型转体承台内部传力机理,本文以武汉跨沪蓉线、麻武线高架转体桥下承台为原型,对十六桩转体承台两种试验模型进行有限元分析。研究结果表明,转体承台底部拉应力主要集中于中间四根桩所构成的矩形区域;非预应力承台在加载过程中,各桩顶反力比例几乎保持不变,桩顶反力未出现重分布;降低桩支承刚度可以降低中间桩的反力,使桩底反力趋于均匀,以提高转体承台的承载性能;施加预应力能显著改善桩顶反力分布,有效降低中间桩的反力,且所施加预应力越大,中间桩反力下降幅度越为明显。In order to study the force transmission mechanism inside the large-scale rotating platform,this paper takes the bearing platform under the elevated rotating bridge across the Hurong Line and the Mawu Line on the Wuhan-Dawu Expressway as the prototype,the finite element analysis of two test models for sixteen rotating bearing platforms was carried out.The results show that the tensile stress at the bottom of the rotating bearing platform is mainly concentrated in the rectangular area composed of the middle four piles.During the loading process of the non-prestressed bearing platform,the proportion of the reaction force of each pile top remains almost unchanged,and the reaction force of the pile top does not redistribute.Reducing the stiffness of pile support can reduce the reaction force of the intermediate pile,so that the reaction force at the bottom of the pile tends to be uniform,so as to improve the bearing capacity of the rotating bearing platform;the application of prestress can significantly improve the distribution of the reaction force at the top of the pile and effectively reduce the reaction force of the intermediate pile.And the greater the prestress applied,the more obvious the decrease in the reaction force of the intermediate pile.

关 键 词：转体承台 群桩基础 传力机理 反力分布 

分 类 号：U445.465[建筑科学—桥梁与隧道工程] U443.25[交通运输工程—道路与铁道工程]