榫卯式钢管脚手架极限承载力试验研究与数值分析

Experimental study and numerical analysis on ultimate bearing capacity of steel pipe scaffold with dovetail joint

榫卯连接是木结构中常用的一种连接方式,将其应用于脚手架形成一种新型的榫卯式钢管脚手架。对榫卯式钢管脚手架开展了12组7.95m高整体支承架足尺试验,研究其极限承载力及行距、列距、步距、剪刀撑对承载力的影响。采用SAP2000软件建立榫卯式钢管脚手架三维模型,经12组实测试验校核得出,数值计算结果和实测结果吻合。运用此模型对50组未进行足尺试验的榫卯式钢管脚手架进行数值模拟扩展计算,结果表明,缩小行距、列距及步距可以提高其承载力,增设剪刀撑也可以提高其承载力。

Dovetail joint is a common type of connection in timber structure. The dovetail joint was applied to steel pipe scaffold as a new type of steel pipe scaffold system. The 12 groups of full-scale experiments on overall supporting frames with 7. 95 meters height were conducted on steel pipe scaffold with dovetail joint. The ultimate bearing capacity was studied as well as impacts of line space,column space,step space and bridging brace on the bearing capacity. The finite element structure analysis software SAP2000 was used to establish 3D numerical model for the steel pipe scaffold with dovetail joint.The numerical calculation was testified by comparing to the measured results in the 12 groups of experiments. The numerical models of SAP2000 were used to conduct numerical simulation on the other 50 groups of steel pipe scaffold with dovetail joint which had not been tested in full-scale experiments. The results show that the ultimate bearing capacity can be improved by shortening the line space,column space and step space,and additional bridging brace can improve its bearing capacity.