插销式钢管脚手架节点焊缝裂纹稳定性分析

Welded Cracks'Stability Analysis of Plug-pin Steel-tube Scaffold

插销式钢管脚手架是一种新型的脚手架体系,该体系搭拆方便,省工省料,应用范围广,具有良好的结构性能和经济效益,是值得重点推广的一项脚手架新技术。但是目前国内几乎没有对这种新体系的理论研究。文中针对人们最为关心的节点问题,首先应用断裂力学理论对节点焊缝裂纹进行了稳定性分析,分析结果表明节点焊缝裂纹在脚手架正常工作状态下是稳定的,不会发生裂纹扩展;然后通过试验对节点V型耳的极限承载能力进行了测试,得到了V型耳的极限承载力以及节点的破坏模式,验证了断裂力学理论分析的成果。

Plug-pin steel-tube scaffold is a new type of scaffold system with good structure, it can be connected and disconnected easily with little manpower, and it can be applied to many fields and brings good economy. This＇ is a new scaffold technology that is very worthy of being popularized. But there is little research on this type of scaffold. This paper lays emphasis on the joint, the most important part of this new scaffold. In this paper the stability of welded cracks of scaffold＂ joint is analyzed by the theory of fracture mechanics, It is found from the theoretical result that the cracks are steady at the normal work condition. The ultimate bearing capacity and the destruction mode of scaffold joint are determined by an experiment, the result of the experiment also indicates the correctness of the theoretical analysis by the theory of fracture mechanics. This paper is very important to popularize the application of this new type of scaffold.