| Solar greenhouse is a facility agriculture construction with typical Chinese characteristic, which independently invented by our country, and has been widely used in the northern region.In recent years, due to country attachs the importance to agricultural industry, especially to the modern agricultural industry, more and more improved new type of solar greenhouses are used and promoted.Based on the structural safety problems and structural design philosophy of solar greenhouse in northern China, aimed at10meters span cambered steel frame brick wall type solar greenhouse that has been build in lvliang area, based on the actual structure of this type of solar greenhouse, combined with the latest load code for the design of building structures in our country, this paper confirms various loads on the cambered steel frame, calculates the value of each load, and importantly calculates the weight of cambered steel frame, snow load and wind load.Based on actual service condition of the sola greenhouse, throwing off the influence of north wind pressure of the sola greenhouse, this paper confirms three possible adverse load combinations. Load combination one:after snow,people operate on roof; load combination two:south wind blows,people operate on roof,and straw has been rolled up at the root; load combination three:south wind blows,people operate on roof, and straw has been unfold down.This paper adopts the method of directly builds finite element model, builds cambered steel frame finite element model in ANSYS12.0software by GUI, and describes the process of the finite element model in detail.This paper analyzes steel structure performance of the cambered steel frame brick wall type solar greenhouse under three kinds of adverse load combinations, gets their deformation diagram and node displacement map and stress map. Gets the following results:the load combination lis the most dangerous load combination; the maximum deformation locates at cambered steel frame’s centre, the maximum deformation value is0.013402m, the maximum normal stress is93.7Mpa; the cambered steel frame is enough safe, and suggests to optimize material and structure.In this paper, the10meter span sola greenhouse’s upper boom is one inch galvanized steel pipe, lower boom is four point galvanized steel pipe, wed member is Φ14galvanized steel. The angle between web member and booms is45°. Suggests that use smaller steel specifications in the later construction and set smaller angle between web member and booms. As far as possible making10meters span greenhouse both can improve lighting performance and can reduce the cost of investment under the condition of meet the structure performance. |
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