發(fā)布時間：2018-11-24 12:06

【摘要】：采用ASHRAE晴空模型,利用光線追蹤算法編制了基于ANSYS有限元軟件的子程序,首次在拱橋溫度場計算中實現(xiàn)了太陽輻射、空氣對流、長波輻射等環(huán)境溫度荷載的自動施加。通過與2010年11月7日位于東經(jīng)108°53′、北緯32°30′的某上承式拱橋現(xiàn)場照片進行對照,驗證了該算法可以準確模擬拱上主梁對拱箱的遮蓋作用。利用有限元法對該拱橋在當天環(huán)境溫度荷載作用下,拱上主梁、拱箱的溫度場進行了分析。結(jié)果表明:在太陽輻射作用下上承式拱橋溫度場分布是不均勻的;主梁對拱箱的遮蓋作用會導(dǎo)致拱箱溫度場分布不均勻,被遮蓋位置的溫度比太陽直射處溫度低;拱橋溫度場隨太陽輻射強度變化而變化,太陽輻射強度在下午三點時最大,此時刻拱箱頂板上下表面最大溫差達到18.5℃。
[Abstract]:Based on the ASHRAE clear sky model and ray tracing algorithm, a subroutine based on ANSYS finite element software is developed. The automatic application of ambient temperature loads such as solar radiation, air convection and long wave radiation is realized for the first time in the calculation of the temperature field of the arch bridge. By comparing with the field photos of an overbearing arch bridge located at 108 擄53'E and 32 擄30'N on November 7, 2010, it is verified that the algorithm can accurately simulate the covering effect of the main girder on the arch box. In this paper, the temperature field of the arch girder and arch box is analyzed by finite element method under the action of ambient temperature load on the same day. The results show that the temperature field distribution of the arch bridge under solar radiation is not uniform, the effect of the main beam on the arch box will lead to the uneven distribution of the temperature field of the arch box, and the temperature of the covered position is lower than that of the direct solar beam. The temperature field of the arch bridge varies with the solar radiation intensity. The solar radiation intensity is the highest at 3 pm, and the maximum temperature difference between the upper and lower surface of the arch box roof reaches 18.5 鈩，

本文編號：2353647