插销式脚手架在异形结构中的安全性能研究

STUDY OF SAFETY PERFORMANCE OF PLUG-IN SCAFFOLD FOR SPECIAL-SHAPED STRUCTURE

为研究插销式钢管脚手架的安全性能,对异形结构中的模板支架和外墙脚手架进行现场试验研究,同时采用ANSYS有限元软件对脚手架进行静力分析和屈曲分析,得到不同工况下脚手架的应力和稳定承载力。研究得出:当稳定系数φ≥0.5时,法国钢结构标准规定的ADG插销式脚手架的安全系数明显高于JGJ 130—2011《建筑施工扣件式钢管脚手架安全技术规范》中K=2的规定;插销式脚手架的节点属于半刚性,当刚度取20 k N·m/rad时,理论值与试验值较为吻合;支模架的失稳属于局部失稳,立杆端部外伸长度对支模架的承载力有着重要影响。建议在对插销式脚手架进行设计时,采用半刚性的有侧移框架理论。

To study safety performance of plug-in steel-tube scaffold,it was conducted field test researches on the falsework and the exterior scaffolding for special-shaped structure. Also static and buckling analyses were done by ANSYS finite element software to obtain the stress and stability capacity of scaffolding under different constructing conditions. The results indicate that when φ exceeds or equals 0. 5,the safety coefficient of ADG plug-in scaffold in French steel structure standard is significantly higher than that in the scaffolding code K = 2 in China; as the nodes of plug-in scaffold are semi-rigid,the theoretical values agree well with the experimental values when stiffness takes20 k N·m / rad. Instability of the falsework belongs to the local instability,the overhang length of vertical bar end has an important impact on the bearing capacity for falsework. It was suggested that the design of plug-in scaffold should use semi- rigid sway frames theory.