预应力混凝土梁桥温度效应分析  

Analysis of Temperature Effect of Prestressed Concrete Girder Bridge

作　　者：何舒法 王治国 周静雯 王龙[1] 张桂通 HE Shufa;WANG Zhiguo;ZHOU Jingwen;WANG Long;ZHANG Guitong(School of Highway,Chang′an University,Xi′an Shaanxi 710064,China)

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《盐城工学院学报（自然科学版）》2021年第1期72-78,共7页Journal of Yancheng Institute of Technology:Natural Science Edition

基　　金：云南省交通运输厅科技项目〔2017〕(A)05号。

摘　　要：温度效应是引起混凝土桥梁裂缝产生的重要因素之一。为研究不同工况下混凝土梁桥的温度效应,通过有限元软件ADINA对梁体在浇筑水化热、日照温差两种工况下的温度场进行模拟,结合某预应力混凝土梁桥实桥跟踪试验温度实测值进行对比分析,并计算出温度应力对结构的影响。结果表明:有限元计算结果与现场实测结果较为一致。混凝土T梁浇筑时,水化热温度先剧烈上升,约7~9 h达到峰值,峰值温度约60℃,然后快速下降趋于平稳,早期水化热应力小于混凝土早期抗拉强度;采用《公路桥涵设计通用规范》中温度梯度计算日照温差应力分布规律与实测值基本一致,腹板处温度应力值比较大,对结构有不利影响。Temperature effect is one of the important factors that cause the cracks of concrete bridge.In order to study the temperature effect of concrete beam bridge under different working conditions,the finite element software ADINA is used to simulate the temperature field of beam body under two working conditions of pouring hydration heat and sunshine temperature difference.Combined with the measured temperature value of tracking test of a prestressed concrete beam bridge,the comparative analysis is carried out,and the influence of temperature stress on the structure is calculated.The results show that the finite element calculation results are consistent with the field measurement results.During the pouring of concrete T-beam,the hydration heat temperature rises sharply at first,reaches the peak value in about 7-9 hours,and the peak temperature is about 60℃,then decreases rapidly and tends to be stable,and the early hydration heat stress is less than the early tensile strength of concrete.The distribution law of sunshine temperature difference stress calculated by the temperature gradient in"General Code for Design of Highway Bridges and Culverts"(JTG D60—2015)is basically consistent with the measured value,and the temperature stress value at the web is relatively large,which has adverse effects on the structure.

关 键 词：混凝土梁桥 温度场 水化热 日照温差 ADINA 

分 类 号：U441.5[建筑科学—桥梁与隧道工程] U448.21[交通运输工程—道路与铁道工程]