立杆初始弯曲随机几何缺陷下带剪刀撑承插型盘扣式脚手架稳定性能研究
牟争强 , 赵伟 , 赵炳震 , 徐岩军 , 邱睿 , 张霓 , 赵中伟
建筑钢结构进展 ›› 2026, Vol. 28 ›› Issue (7) : 82 -91.
立杆初始弯曲随机几何缺陷下带剪刀撑承插型盘扣式脚手架稳定性能研究
Research on Stability of Scissor-Braced Disk-Lock Scaffolding with Random Initial Bending Imperfections of Vertical Poles
脚手架是建筑工程施工中不可或缺的临时设施,应用十分广泛。现阶段脚手架倒塌事故频发,主要诱因是立杆经反复使用后产生弯曲缺陷,且这类几何缺陷在实际工程中具有明显随机性。文中通过ANSYS有限元软件,结合随机有限元分析方法,建立了精细化带剪刀撑承插型盘扣式脚手架数值模型,最大程度还原工程实际工况,探究立杆初始弯曲随机几何缺陷对脚手架承载能力的影响;并在此基础上,分析剪刀撑类型、布设跨数、平面布置形式及节点密度等参素对该脚手架稳定性能的影响规律。研究结果表明:脚手架的荷载因子由其屈曲模态决定;横向约束对脚手架承载能力的提升幅度会受脚手架横、纵跨数影响;增设垂直剪刀撑后,带横向约束脚手架的承载力可提升20.3%~146.9%;节点密度对架体承载能力的提升效果由剪刀撑与横杆的夹角大小决定。
As an indispensable structure in practical engineering, scaffoldings are widely used. However, many engineering accidents are caused by scaffolding failures. One of the main reasons is bending defects caused by the repeated use of the vertical pole in practice Because these geometric imperfections are random, a refined finite element model of scaffolding with scissor braces was established based on the stochastic finite element analysis method using ANSYS finite element software. This method can study the influence of random geometric imperfections from the initial bending of vertical poles on the load-bearing capacity of scaffolding to the greatest extent under actual conditions. On this basis, the influence of factors such as the type of scissor brace, the number of spans, the layout configuration, and the joint density on its stability was revealed. The results show that the load factor of the scaffold is determined by its buckling mode. The effect of lateral constraints on the load-bearing capacity of scaffolding is affected by the number of horizontal and vertical spans of scaffolding. Vertical scissor braces can increase the load-bearing capacity of scaffolding with lateral constraints at the top by 20.3%-146.9%. The effect of joint density on the load-bearing capacity of scaffolding is determined by the angle between the scissor brace and the ledger.
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