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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。
Mortise and tenon joints are commonly used in wooden structures as a way to connect scaffolding to form a new mortise-and-tenon steel scaffolding. Twelve sets of 7.95m high overall support frame full-scale test were carried out on the tenon-type steel scaffolding to study the ultimate bearing capacity and the influence of the ultimate bearing capacity, row spacing, pitch and scissors support on the bearing capacity. Using SAP2000 software to establish three-dimensional model of mortise-tenon steel scaffolding, after 12 groups of test results, the numerical results are in good agreement with the measured results. Fifty groups of tenon-type steel scaffolds without full-scale test were expanded by using this model. The results show that the reduction of row spacing, pitch and step can improve the bearing capacity of the mortises, and the increase of scissors support can also increase the bearing capacity.