新型铝合金型材日光温室结构静力性能分析OA

To assess the applicability of a new type of aluminum alloy profile in the structural skeleton of solar greenhouses,a structural model of an aluminum alloy profile greenhouse was established using finite element software.First,nine typical load cases,including dead loads,snow loads,wind loads,crop loads,and maintenance loads,were considered to systematically analyze the displacement and stress distribution patterns of the frame and identify the most unfavorable load condition.Second,the arc-length method was employed to trace the entire nonlinear instability process of the frame under non-uniform snow load.Finally,the influence of structural span(8 m,10 m,12 m)and profile wall thickness(1.9 mm,2.9 mm,4.3 mm)on the ultimate bearing capacity was investigated.The results indicate that non-uniform snow load is the most unfavorable factor governing structural design,inducing a maximum vertical displacement of 20.45 mm and a maximum bending stress of 57.19 MPa in the frame,significantly exceeding those under other load cases.Structural instability initiates at the front roof base and the ridge connection,and the ultimate bearing capacity is reached when the basic snow pressure attains 1.94 kN·m-2.The ultimate bearing capacity is highly sensitive to span variation;increasing the span from 8 m to 12 m results in a substantial capacity reduction of 60.82%.While increasing wall thickness enhances the bearing capacity,the mechanical efficiency diminishes.Increasing the thickness from 1.9 mm to 4.3 mm yields only a 28.87%improvement in capacity,alongside a 26.7%increase in material consumption.This study provides a theoretical basis for the disaster-resistant design and optimization of aluminum alloy profile solar greenhouses.