桥梁支架预压形变有限元模拟与预拱度优化设置  

Finite Element Simulation of Preloading Deformation of Bridge Supports and Optimization of Pre-camber Setting

作　　者：钱明明 龙四春[1] 刘茂琪 赖咸根 周健 QIAN Mingming;LONG Sichun;LIU Maoqi;LAI Xiangen;ZHOU Jian(College of Earth Science and Space Information Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;China Construction Fifth Engineering Bureau Civil Engineering Co.,Ltd.,Changsha 410011,China;China Construction Fifth Engineering Bureau Co.,Ltd.,ChangSha 410011,China)

机构地区：[1]湖南科技大学地球科学与空间信息工程学院,湖南湘潭411201 [2]中国建筑第五工程局土木工程有限公司,湖南长沙410011 [3]中国建筑第五工程局有限公司,湖南长沙410011

出　　处：《矿业工程研究》2024年第3期51-57,共7页Mineral Engineering Research

基　　金：国家自然科学基金面上资助项目(42377453);湖南省科技创新计划资助项目(2021RC4037);湖南省自然科学基金资助项目(2023JJ30235)。

摘　　要：为研究支架预压形变规律,优化传统预拱度设置曲线,以长株潭西环线高架桥区间满堂支架结构预压试验为工程背景,结合设计预压方案和现场施工情况,选取31-32桥跨支架结构实测数据和模拟数据进行对比分析,并用多项式拟合的方法对预拱度曲线进行优化设置.结果表明:高架桥预压预拱度设置曲线并非一条平滑的二次函数曲线,根据四次多项式拟合得到的预拱度曲线更符合现场实际工况.并用7-8桥跨支架结构的实测数据和拟合所得的预拱度曲线进行对比分析,证实采用多项式拟合法优化施工预拱度曲线具有可行性,研究结果可为类似桥梁预压施工提供参考.To study the preloading deformation pattern of scaffolds and optimize the traditional pre-camber setting curve,this paper uses the full-support scaffold pre-stress test of the Changsha-Zhuzhou-Xiangtan Western Ring Road elevated bridge section as the engineering background.Combining the design pre-stress plan with the on-site construction conditions,we select the measured data and simulate data of the 31-32 bridge span scaffold structure for comparative analysis.We optimize the pre-camber curve using polynomial fitting methods.The results indicate that the pre-camber setting curve for elevated bridges is not a smooth quadratic function curve,and the pre-camber curve obtained through a quartic polynomial fit better matches the actual on-site conditions.Additionally,by comparing the measured data of the 7-8 bridge span scaffold structure with the fitted pre-camber curve,it is confirmed that using polynomial fitting methods to optimize the construction pre-camber curve is feasible.The research findings can provide references for similar bridge preloading construction.

关 键 词：满堂支架 有限元模拟 预压形变 预拱度优化 

分 类 号：U248[交通运输工程—道路与铁道工程]