4种曲线形日光温室前屋面采光性能及其拱架力学性能的比较

Comparing the front roof permeated sunlight performances and the arch mechanical performances of four curvilinear roofs of solar greenhouse

【目的】研究不同曲线形日光温室前屋面的采光及其拱架力学性能,为日光温室的设计提供参考。【方法】利用日光温室采光模型,模拟三次样条函数、圆弧、椭圆、抛物线4种曲线形日光温室前屋面的进光量,采用有限元方法计算3种荷载组合下各曲线形拱架的截面应力。【结果】三次样条函数、圆弧、椭圆、抛物线形前屋面的进光量分别为40467,39451,39306和35845kJ。在荷载组合1作用下,椭圆形拱架的截面应力最大,为3514MPa;抛物线形拱架次之,为3466MPa;三次样条函数形拱架为2906MPa;圆弧形拱架最小,为1479MPa。【结论】综合前屋面进光量和拱架力学性能指标,4种曲线形日光温室前屋面中,以三次样条函数形日光温室前屋面更具实用性。

【Objective】In oder to advance the design of solar greenhouse,the front roof permeated sunlight and the arch mechanical performances of different curvilinear roofs of solar greenhouse were compared.【Method】The simulation of sum sunlight transmiting the thrice spline,circular arc,ellipse and parabola curvilinear roofs of solar greenhouse and the finite element analysis calculating sectional stress of the arch under the three loads combination were applied.【Result】The result indicates that the sum permeation s...