华东型连栋塑料温室的拱顶曲线研究

Investigation of the vault curve of East-China type multi-span greenhouse

在综合分析原有雪载荷计算方法的基础上,应用微分的思想探索更能反映拱顶特性的雪荷载估算方法.并在此基础上,以最大抗雪载能力为目标,优化了华东型连栋塑料温室的拱顶切线角.对东西走向和南北走向的华东型连栋塑料温室采用曲线积分的方法,在考虑相互遮荫的情况下,模拟计算了在冬至日正午时各种拱项切角双圆弧屋面的采光性能.结果表明:当拱项切线角为15°～20°时,拱顶具有最佳的抗积雪性能,而拱顶的采光性能随拱顶切角的变化不明显.

Based on synthesis and analysis of traditional snow-load calculation method, an improvement was proposed with an aim of reflecting snow-load of the vault curve characteristics more exactly. Optimization of the vault tangential angle of East-China multi-span greenhouse was attained, which was accomplished by applying the principle of maximum snow-load bearing capacity. Meanwhile, taking the mutual shading effect of the neighboring spans into account, the direct solar radiation of arc vault of both east-west and south-north oriented multi-span greenhouse at noon on the day of winter solstice was calculated using the curvilinear integral method. Our result showed that greenhouse would have maximum snow-load bearing capacity when its vault tangential angle was in the range of 15°-20°, whereas the solar radiation collection ability of greenhouse was not significantly affected by variation in tangential angle of the vault.