Abstract
Since greenhouses are highly expensive structures, they need to be designed carefully with the use of modern technology of the day. Especially in the design of high-cost steel-framed greenhouses, system selection and dimensioning play an important role in economical design of load-bearing members. This study was conducted to investigate the effects of two different roof types (gothic and gable), two different truss spacings (2.5 and 3 m) and three different truss spans (6, 8 and 9.6 m) on cross-sections of load-bearing steel members, overall weight and final cost of greenhouse systems. Overall width of the systems was 48 m, length was 60 m and height was 4.5 m. Totally, 12 different greenhouse systems were designed and analyzed with the use of SAP2000 software, AutoCAD software, Excel worksheets, relevant standards and regulations. It was concluded based on present findings that gothic roof system with 3 m truss spacing and 9.6 truss span was lighter and more economical than the other systems. In terms of safety, gothic and gable roof systems with 6 m truss span and 2.5 m truss spacing were superior to other systems.
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