大跨度混凝土连续箱梁桥温度效应研究  

Study on Temperature Effect of Long-span Concrete Continuous Box Girder Bridge

作　　者：麦鑫浩 MAI Xinhao(China Railway 24th Bureau Group Co.,Ltd.,Shanghai 200071)

机构地区：[1]中铁二十四局集团有限公司,上海200071

出　　处：《公路交通技术》2023年第5期88-94,共7页Technology of Highway and Transport

基　　金：江苏省重点研发计划项目(BE2018120)。

摘　　要：为探明大跨度混凝土箱梁桥施工及成桥阶段的温度场及温度效应,以某实际箱梁桥为研究对象,基于现场监测的温度数据,拟合得到日照作用下混凝土箱梁的竖向温度梯度模式,并在此基础上,建立桥梁各阶段的温度效应结构计算模型,重点研究了箱梁桥在现场监测及各国规范规定的温度梯度模式下的温度应力及竖向挠度分布规律,分析了现场监测得到的最不利竖向温差模式下混凝土箱梁截面的横向及竖向温度应力分布规律。研究结果表明:1)中国《铁路桥涵混凝土结构设计规范》(TB 10092—2017)规定的温度梯度模式的计算结果与依托工程桥梁现场监测结果一致性最好,英国桥梁规范接近;2)混凝土箱梁的顶板和底板主要承受横向温度应力,腹板主要承受竖向温度应力。In order to investigate the temperature field and temperature effect of long-span concrete box girder bridge during construction and completion stages,an actual box girder bridge was taken as the object of study.Based on the temperature data monitored in the field,the vertical temperature gradient model of concrete box girder under sunlight was obtained by fitting.On this basis,the structural calculation model of temperature effect in each stage of the bridge was established.The temperature stress and vertical deflection distribution models of the box girder bridge under the temperature gradient models specified by the on-site monitoring and the national specifications were studied in particular,and the transverse and vertical temperature stress distribution models of concrete box girder sections under the most adverse vertical temperature difference model obtained from the on-site monitoring were also analyzed.The results show that:1) The calculation results of the temperature gradient model specified in Code for Design of Concrete Structures of Railway Bridge and Culvert(TB 10092—2017) of China are in the best agreement with the on-site monitoring results of the dependent bridges,which are close to the British bridge specifications;2) The top and bottom of concrete box girder mainly bear transverse temperature stress,and the web mainly bears vertical temperature stress.

关 键 词：混凝土箱梁桥 温度梯度模式 现场监测 温度场 温度效应 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]