Influence Analysis of Steel Box Girder Structure on Temperature Field under Sunlight Conditions

doi:10.3969/j.issn.1674-0696.2023.05.02

Abstract

Abstract: The temperature field generated by steel box girders under sunlight conditions is an important factor to be considered in the design of bridge structures. Based on the basic theory of heat transfer and finite elements, a model of the temperature field of steel box girder under sunlight conditions was established by use of ABAQUS finite element software. Based on the comparison and verification with the field measured data, the influence of temperature distribution on the steel box girder was analyzed. The results show that the different orientation of the bridge affects the amount of solar radiation received by the web on both sides, which in turn leads to significant changes in the transverse temperature difference between the left and right webs of the box chamber. The ratio between the length of the flange plate and the height of the box girder is negatively correlated with the irradiated area of the web, and an increase in the irradiated area will expand the area of transverse temperature difference in the box chamber. A decrease in the inclination angle of the web will reduce the value of solar radiation received by the web. When the angle between the web and the top plate decreases by 15° from 90°, the transverse temperature difference between the two sides of the web decreases by about 20%. The shape and layout of the stiffening ribs are important factors affecting the local temperature field of the steel box girder. The temperature value of the open stiffener area is lower than that of the closed stiffener area, and increasing the height of the stiffener and reducing the layout spacing are beneficial for reducing local temperature. The most unfavorable combinations for the temperature field of steel box girder are summer, north-south orientation, short flange with high box girder and straight web.

Key words: bridge engineering; steel box beam; temperature field; reinforced rib; finite element analysis

摘要： 日照条件下钢箱梁产生的温度场是桥梁结构设计需要考虑的重要因素。基于传热学和有限元基本理论，利用ABAQUS有限元软件建立了日照条件下钢箱梁温度场模型，在现场实测数据对比验证的基础上，开展了钢箱梁温度分布的影响分析。结果发现：桥梁的不同走向影响两侧腹板接收的太阳辐射量，进而导致箱室横向左右腹板温差变化明显；翼缘板长度和箱梁高度的比值与腹板的照射面积呈负相关，照射面积增加会扩大箱室横向温差的区域；腹板倾角减小会降低腹板接收太阳辐射值，当腹板与顶板的夹角自90°始每减少15°，两侧腹板的横向温差则缩减约20%；加劲肋造型和布局是影响钢箱梁局部温度场的重要因素，开放式加劲肋区域温度值低于封闭式，增加加劲肋高度和缩小布置间距有利于降低局部温度；钢箱梁温度场的最不利组合为夏季、南北走向、短翼缘配合高箱梁以及直腹板。

关键词: 桥梁工程；钢箱梁；温度场；加劲肋；有限元分析

CLC Number:

U443.3

HUANG Haixin1, YAN Shisong1, LI Chunming2, KOU Zhitian1. Influence Analysis of Steel Box Girder Structure on Temperature Field under Sunlight Conditions[J]. Journal of Chongqing Jiaotong University(Natural Science), 2023, 42(5): 9-15.

黄海新1，严仕松1，李春明2，寇志天1. 日照条件下钢箱梁构造对温度场的影响分析[J]. 重庆交通大学学报（自然科学版）, 2023, 42(5): 9-15.

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