Research and Design of Λ-Shaped Folding Plate Grid Structures
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摘要: Λ形折板网格结构是折板结构的一种,其组成单元形式为Λ形。首先对此类结构的结构形式分类及Λ形折板构成单元的形式进行了介绍;其次对Λ形单元为等腰三角形的折板网格结构进行了静力分析,推导了其惯性矩、上下弦杆应力及挠度的计算公式;随后对Λ形折板网格结构的一系列关键问题进行了研究,包括Λ形折板网格结构的抗弯刚度、受压弦杆平面外的稳定性能、积雪不均匀分布的情况以及悬挑Λ形折板网格结构需要采取的一些加强措施;最后对Λ形折板网格结构的经济性进行了分析,以上下弦杆的用钢量为主,得到了其用钢量与Λ形单元形式的关系。Abstract: Λ-shaped folding plate grid structure is a type of folding plate structure, and its component element form is Λ-shaped. First, the classification of this kind of structure and the configuration of the Λ-shaped folding plate elements were introduced. Then, a static analysis of the folding plate grid structure with isosceles triangular Λ-elements was carried out, and formulas for the moment of inertia, the stresses in the upper and lower chords, and deflection were derived. Subsequently, a series of key problems related to the Λ-shaped folding plate grid structure were studied, including the flexural rigidity of the grid structure, the out-of-plane stability of its compression chords, the effects of uneven snow load distribution, and some strengthening measures necessary for cantilevered Λ-shaped folding plate grid structures. Finally, an economic analysis of Λ-shaped folding plate grid structures was conducted. Focusing on the steel consumption of the top and bottom chords, the relationship between steel consumption and the form of the Λ-shape element was established.
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