铁道科学与工程学报2025，Vol.22Issue(1)：195-206,12.DOI:10.19713/j.cnki.43-1423/u.T20240402
西北大温差地区钢-混组合梁温度效应及其适用公式
Temperature effects on steel-concrete composite beams and their applicable formulas in Northwest region with large temperature difference in China
摘要
Abstract
To examine the temperature distribution and effects on steel-concrete composite girder bridges in the northwest region's significant temperature variations,and to establish a local applicable formula for temperature gradient effects,this study presented a 1∶5 scale model of a steel-concrete composite girder.The model was inspired by the main bridge of the Sang Yuan Zi Yellow River Bridge in the Lanzhou area and undergoes an experimental temperature field analysis.The research concentrated on the distribution patterns of the temperature field and the temporal characteristics of steel-concrete composite beams under two distinct temperature effects:solar radiation and abrupt cooling,both within a large temperature fluctuation context.Analyzing the temperature field tests on these beams,the study delineated how the temperature of steel-concrete composite beams varied over time under these conditions and identifies the most adverse calculation formula for the temperature gradient load.Findings indicate that solar radiation has a more pronounced impact on the temperature of steel-concrete combined beams than sudden cooling.The temperature variation over time in steel-concrete beams,under solar radiation,deviates from a sinusoidal pattern due to the'shading effect',leading to a noticeable inflection in the temperature curve of the steel beam's web.A temperature differential,up to 4.5℃,is observed at the interface where the concrete deck meets the steel girder in the composite bridge.Additionally,the concrete deck's temperature field changes lag behind ambient temperature shifts.The study introduces a quadratic parabolic model to accurately calculate the most unfavorable vertical temperature gradients,both positive and negative,which is well-suited for the northwest region's substantial temperature differences.This model enhances the continuity between the concrete deck and steel girder,ensuring high precision and reliability.The insights gained from this research are instrumental for the calculation of temperature gradient loads and the structural design of similar steel-concrete composite beam projects in China's northwestern regions,where significant temperature variations occur.关键词
钢-混凝土组合梁桥/温度场/西北大温差/最不利温度梯度/适用公式Key words
combined steel-concrete girder bridges/temperature fields/the great northwest temperature difference/most unfavourable temperature gradients/suitable formula分类
土木建筑引用本文复制引用
宋毅,张戎令,樊江,武维宏,黎并宇,刘永超..西北大温差地区钢-混组合梁温度效应及其适用公式[J].铁道科学与工程学报,2025,22(1):195-206,12.基金项目
甘肃省交通运输厅揭榜挂帅制科研项目(202102) （202102）
交通运输行业重点科技项目(2021-ZD2-073) （2021-ZD2-073）
甘肃省科技重点研发计划(21YF11GA011) （21YF11GA011）
