THE INFLUENCE OF SOLAR RADIATION ON STEEL BOX GIRDERS
The concept of steel box girders, equipped with an orthotropic bridge deck and constructed using stiffened plates has been one of the most frequently used for road bridges and flyovers. They are an economical solution. During the day, a box section is subjected to the influence of the diurnal solar radiation cycle. This paper describes the results of a highly detailed finite element analysis of the influence of this thermal loading on the temperature gradient in the bow girder. The main objective of this research is to reach a fundamental insight in the resulting problems and in the behavior of closed steel box girders, subjected to a variable thermal load.This additional load will have repercussions on the stability of the box section. The live load stresses are already quite high as it is, in addition, the thermal load might influence the composite behavior of the steel deck and the asphalt wearing courses on top, thus reducing the diminishing influence of the wearing course on the stress ranges in the deck plate. This paper reports on the finite element modeling of such thermal loading. The model includes the effects of solar radiation, mutual radiation between the parts of the box girder and the stiffeners and the convective flow in and surrounding the bow girder. Based on this model, it can be concluded that thermal loading cannot be neglected and that considerable additional stresses can arise in the contact zone between the deck plate and the wearing courses.
thermal loading steel box girders closed stiffeners wearing courses
H De Backer A Outtier Ph Van Bogaert
Ghent University, Belgium
国际会议
The 9th International Conference on Steel Space & Composite Structures(第九届国际钢材、空间结构、组合结构会议)
烟台·北京
英文
335-342
2007-10-10（万方平台首次上网日期，不代表论文的发表时间）