大跨度波形钢腹板箱梁桥的温度效应研究  

Temperature effects of longspan corrugated steel web box girder bridge

作　　者：张文东 胡君涛 马志亮 景伟[2] 李龙花 ZHANG Wendong;HU Juntao;MA Zhiliang;JING Wei;LI Longhua(China Construction Fourth Engineering Division Corp.Ltd.,Guangzhou 510665,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]中国建筑第四工程局有限公司,广东广州510665 [2]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《青海大学学报》2024年第6期75-82,共8页Journal of Qinghai University

基　　金：国家自然科学基金(52168042);中国建筑第四工程局科技研发课题(CSCEC4B-2023-KTA-17)。

摘　　要：波形钢腹板箱梁在日照下存在显著的温度梯度效应,为此对青海省海南藏族自治州贵德县惠安黄河大桥的波形钢腹板箱梁进行了温度场及温度效应研究。首先,通过分析现场观测数据得到横向温度场和竖向温度场的分布情况;然后,利用MATLAB软件中的最小二乘法对波形钢腹板箱梁的温度梯度进行拟合,进而构建波形钢腹板箱梁的横向和竖向温度梯度数学计算模型,并确立波形钢腹板箱梁的横向和竖向温度梯度模式;最后,建立波形钢腹板箱梁三维数值计算模型,利用实测温度场数据对波形钢腹板箱梁数值仿真模型进行验证并开展数值模拟。结果表明:实测混凝土顶板最高温度呈现出显著的不均匀性;横向和竖向温度梯度模式均为分段函数;数值仿真模型在模拟波形钢腹板箱梁的温度变化方面能够满足精度要求;基于温度梯度模式计算得出,桥梁的最大拉应力出现在顶板与腹板的连接处,且其值较大,可见在黄河上游建造大跨度波形钢腹板桥梁应重视温度效应。There is a significant temperature gradient effect in the corrugated steel web box girder under sunlight.Therefore,a study of temperature field and temperature effect is conducted on the corrugated steel web box girder of Huian Yellow River Bridge in Guide County,Hainan Prefecture of Qinghai Province.Firstly,the distribution of transverse and vertical temperature fields is obtained by analyzing on-site observation data.Secondly,using the least squares method in MATLAB software to fit the temperature gradient of corrugated steel web box girder,a mathematical calculation model for the transverse and vertical temperature gradient of corrugated steel web cast-in-place box girder is constructed,and the transverse and vertical temperature gradient modes of corrugated steel web are established.Finally,a three-dimensional numerical calculation model of corrugated steel web box girder is established,verified and carried out through measured temperature field data.The results are as follows:The measured maximum temperature of concrete roof shows significant unevenness.The horizontal and vertical temperature gradient patterns are both piecewise functions.The numerical simulation model can meet the accuracy requirements in simulating the temperature changes of corrugated steel web box girders.Based on the temperature gradient model calculation,the maximum tensile stress of the bridge occurs at the junction of the top plate and web plate,and its value is relatively large.It can be seen that the construction of longspan corrugated steel web bridges in the upper reaches of the Yellow River should pay attention to temperature effect.

关 键 词：波形钢腹板 箱梁 温度效应 数值模拟 温度梯度 

分 类 号：U445[建筑科学—桥梁与隧道工程]