采用塑性铰线理论，对三种可能的塑性铰线形式分别进行分析，得到极限承载力的解析式。
Using plastic yield line theory, three yield line patterns are analysed and the formulas of the ultimate bearing capacity are obtained.
铜绿山矿某三铰拱屋架单轨吊梁结构体系，因技术改造增加设备简体重量，随意用滑轮组起吊检修，导致拱架上弦全截面贯通式开裂的结构事故。
Then the structural accident of total section drive-through type crack is caused in arch frame top chord, which is induced by hoisting and detection using pulley arbitrarily.
由八个三角形的部分相互铰合而成，放置水平后行人即可通行。
It consists of eight triangular sections hinged at the walkway level.
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