太阳辐射作用下拱桥温度场研究
发布时间：2018-11-24 12:06
【摘要】：采用ASHRAE晴空模型,利用光线追踪算法编制了基于ANSYS有限元软件的子程序,首次在拱桥温度场计算中实现了太阳辐射、空气对流、长波辐射等环境温度荷载的自动施加。通过与2010年11月7日位于东经108°53′、北纬32°30′的某上承式拱桥现场照片进行对照,验证了该算法可以准确模拟拱上主梁对拱箱的遮盖作用。利用有限元法对该拱桥在当天环境温度荷载作用下,拱上主梁、拱箱的温度场进行了分析。结果表明:在太阳辐射作用下上承式拱桥温度场分布是不均匀的;主梁对拱箱的遮盖作用会导致拱箱温度场分布不均匀,被遮盖位置的温度比太阳直射处温度低;拱桥温度场随太阳辐射强度变化而变化,太阳辐射强度在下午三点时最大,此时刻拱箱顶板上下表面最大温差达到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 掳53'E and 32 掳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，
本文编号：2353647
[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 掳53'E and 32 掳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，
本文编号：2353647
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