拼宽长联预应力混凝土连续T梁桥受力性能研究  

Research on the Mechanical Performance of Long-connected Prestressed Concrete Continuous T-beam Bridge with Spliced Width

作　　者：陈强 王渠[2] 杨文锦 周锦 廖朝晖 彭俊喆 CHEN Qiang;WANG Qu;YANG Wenjin;ZHOU Jin;LIAO Chaohui;PENG Junzhe(China Water Resources and Hydropower 16th Engineering Bureau Co.,Ltd.,Fuzhou 350003,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]中国水利水电第十六工程局有限公司,福建福州350003 [2]福州大学土木工程学院,福建福州350108

出　　处：《佳木斯大学学报(自然科学版)》2024年第12期120-123,共4页Journal of Jiamusi University:Natural Science Edition

基　　金：国家自然科学基金资助项目(51808126);福建省自然基金项目(2024J01356);福建省本科高校教育教学研究项目(FBJY20230045);福建省交通运输科技计划项目(JC202320)。

摘　　要：随着社会经济的持续快速发展,已有公路难以满足不断增长的交通量需求,对现有公路的拼宽改造迫在眉睫。选取某实际工程中长联连续T梁桥第一联主桥为研究对象,建立MIDAS/CIVIL三维杆系有限元模型,分析了混凝土收缩徐变、温度梯度、整体升降温等长期荷载对桥梁水平位移的影响,进一步研究混凝土收缩效应随跨数跨径的变化规律。分析结果表明:4种长期荷载的作用下,纵桥向全拼接使得桥梁在纵、横桥向均会产生变形,最大值出现在桥台或一联的过渡墩位置。其中,混凝土收缩引起的横桥向变形最大,占比达到了60.95%。推导得到可快速预估混凝土收缩影响程度的经验公式,推导值的误差均在5%以内。Existing infrastructure projects are increasingly unable to cope with rising traffic demands due to sustained and rapid socio-economic development in surrounding areas.Urgent measures are required to expand and renovate current highways.This study focuses on the primary bridge of a long continuous T-beam bridge in a practical project.It establishes MIDAS/CIVIL three-dimensional finite element(FE)models to analyze the effects of concrete shrinkage,creep,gradient temperature variations,and overall temperature fluctuations on longitudinal and transversal girder deformations.The findings reveal that prestressed continuous beam bridges with fully spliced longitudinal spans experience deformations in both longitudinal and transverse directions under four long-term loads,with maximum values typically occurring at abutments or piers at the end of each continuous segment.Concrete shrinkage notably influences transverse bridge deformation post-splicing,accounting for up to 60.95%of the total deformation.Additionally,derived formulas enable a rapid estimation of concrete shrinkage effects,with formula-derived values showing errors within 5%.

关 键 词：长联 预应力混凝土连续T梁桥 拼宽 长期荷载 变形分析 

分 类 号：U443.3[建筑科学—桥梁与隧道工程]