基于路面亮度曲线的公路隧道敞开式遮阳棚设计

公路隧道出入口常设置两侧敞开式遮阳棚以改善隧道接近段的亮度过渡和通风问题。本文基于不同太阳辐射角度和强度下的遮阳棚内路面亮度曲线的分析,研究了遮阳棚的侧向敞开高度、敞开位置以及顶棚玻璃透光率等设计参数对棚内路面亮度曲线的影响。结果表明：侧向敞开高度对遮阳棚内路面亮度曲线的影响最为显著,敞开高度越小,遮阳棚内平均路面亮度越小；当敞开高度一定时,通过调节敞开位置和改变顶棚玻璃透光率可进一步优化路面亮度曲线,使其更接近人眼视觉适应曲线。基于合理的参数化设计,本文对三种减光方式的敞开式遮阳棚进行了工程实例分析,这可为改进类似敞开式遮阳棚的减光设计提供指导。

Design of the Open Sunshade Awnings for Highway Tunnels Based on the Luminance Curves of Road Pavement

Open sunshade awnings, with side walls fully or partially opened, are often designed as the light-reducing structures near the highway tunnel entrances and exits, not only for the smooth transition between natural light and tunnel lightings, but also for the economic ventilation. This work studied the effects of the design parameters, such as the lateral open height, the open position, and the roof transmittance, on the luminance curves of road pavement under the awnings calculated at different solar radiation angles and intensities. The results show that the lateral open height is the most significant effect on the pavement luminance curves under the awnings. The smaller the open height is, the smaller the average pavement luminance is; At a constant open height, the road luminance curve can be further improved to approach the human visual adaptation curve by adjusting the open position and/or changing the light transmittance of ceiling glass. Additionally, case studies based on the reasonable parametric design are proposed for sunshade awnings with different dimming manners. This can provide guides into the improved design of light reduction in similar open awnings.