寒区拱桥工字形拱肋竖向温度敏感性及温度梯度  

Vertical temperature sensitivity and temperature gradient of I-shaped arch ribs of cold region arch bridges

作　　者：刘兴国 殷允顺 徐培彬 LIU Xingguo;YIN Yunshun;XU Peibin(School of Civil Engineering,Harbin Univ.,Harbin 150086,China;Trading of Heilongjiang Province Planning Consulting Co.,LTD,Transport Planning Institute,Harbin 150036,China)

机构地区：[1]哈尔滨学院土木建筑工程学院,哈尔滨150086 [2]黑龙江省交投规划咨询有限公司交通规划研究所,哈尔滨150036

出　　处：《海军工程大学学报》2023年第4期63-70,99,共9页Journal of Naval University of Engineering

基　　金：黑龙江省重点研发计划指导类项目(GZ20220124)。

摘　　要：针对高寒地区影响系杆拱桥中拱肋竖向温度分布因素的确定及温度梯度的取值问题,通过现场试验,基于桥梁地理位置的气象参数和结构材料热特性,利用ANSYS建立温度场热导分析模型,对系杆拱桥中拱肋竖向温度场的敏感性进行了比较分析,并采用非线性回归预测法提出了该地区拱肋竖向温度梯度系数的建议值。研究表明:在影响拱肋竖向温度梯度分布的众多因素中,太阳辐射强度及混凝土导热系数起到主要作用,且随太阳辐射强度减小、混凝土导热系数的增加,拱肋上缘温差减小;基于拱肋竖向温度分布模式,确定了该地区拱肋100 a的竖向温度模式,所得到的竖向温度梯度比我国公路桥规及美国AASHTO规范中的温差值沿结构竖向下降得更慢。Aiming at determining the factors affecting the vertical temperature distribution of the arch rib in the tied arch bridge in the alpine region and the value of the temperature gradient,based on the meteorological parameters of the bridge′s geographical location and the thermal characteristics of the structural materials,an analysis model of the thermal conductivity of the temperature field was established through field tests by using the ANSYS software.A comparative analysis was conducted on the sensitivity of the vertical temperature field of the arch ribs in tied arch bridges,and a suggested value for the vertical temperature gradient coefficient of the arch ribs in the region was proposed using nonlinear regression prediction method.The research shows that the solar radiant intensity and the thermal conductivity of concrete play a major role in many factors affecting the vertical temperature gra-dient distribution of arch ribs,and that the temperature difference at the upper edge of arch ribs decreases with the decrease of the solar radiant intensity and the increase of the thermal conductivity of concrete.It is determined that the 100 year vertical temperature model of the arch rib in this area is based on the power index model of the vertical temperature distribution of the arch rib.The vertical temperature gradient obtained in this article decreases more slowly along the vertical direction of the structure compared to the temperature difference values in China′s highway regulations and the Ame-rican AASHTO regulations.

关 键 词：拱肋混凝土 有限元分析 敏感性分析 温度梯度 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]