碗扣式钢管支撑架不同构造形式节点的转动刚度试验研究  

Experiment on Rotational Stiffness for Joints with Different Structural Forms of Cuplock Steel Tubular Formwork Support

作　　者：张金轮 张阿祥 王家伟 ZHANG Jinlun;ZHANG Axiang;WANG Jiawei(School of Architecture and Civil Engineering,Anhui Polytechnic University,Wuhu 241000,China)

机构地区：[1]安徽工程大学建筑工程学院,安徽芜湖241000

出　　处：《建筑钢结构进展》2024年第5期73-83,共11页Progress in Steel Building Structures

基　　金：安徽省高校自然科学基金(KJ2019A0159、KJ2021A0504)。

摘　　要：为研究碗扣式钢管支撑架不同构造形式节点的转动刚度特性,提出测定支撑架体的角节点、边节点与中间节点转动刚度的试验方案,对应分别插入2根、3根和4根水平杆的节点转动刚度试验。在利用相应扣件式节点试验来验证本方案合理性的基础上,对当地市场随机采购的碗扣式钢管的弹性模量进行测定。采用三折线模型对碗扣式节点的M-θ曲线进行拟合,分析了不同水平杆数量对其转动刚度的影响及其破坏特点。研究结果表明:(1)碗扣式钢管支撑架角节点、边节点的转动刚度分别为中间节点转动刚度的77.93%、92.14%,且均高于规范给出的建议值25 kN·m·rad-1;角节点与边节点的转动刚度相对较弱,对架体整体稳定性的影响不可忽略;(2)当地市场随机采购的碗扣式钢管的弹性模量较新构件有不同程度的下降,最大降幅约为30%;(3)碗扣式节点的破坏先后顺序为水平杆、上碗扣、立杆和下碗扣;节点的破坏发生在水平杆接头处,应对此处加强质量监管。相关结论可为同类半刚性节点的转动刚度确定提供参考。In order to study the rotational stiffness characteristics of the joints with different structural forms of the cuplock steel tubular formwork support,a test scheme is proposed to measure the rotational stiffness of corner joints,side joints,and middle joints of the formwork support,corresponding to the joint rotational stiffness test for 2,3 and 4 inserted horizontal tubes respectively.Based on the rationality of the scheme verified by the corresponding coupler joint test,the elastic modulus of the cuplock steel tubes randomly purchased in the local market is measured.The M-θcurve of the cuplock joint is fitted by the tri-linear model,and the influence of different numbers of horizontal tubes on its rotational stiffness and its failure characteristics are analyzed.The results show that:(1)The rotational stiffness of the corner joints and side joints of the cuplock steel tubular formwork support is 77.93% and 92.14%of that of the middle joints respectively,and both are higher than the recommended value of 25 kN·m·rad^(-1) given in the code.The rotational stiffness of corner joints and side joints is relatively weak,which has a significant influence on the overall stability of frame.(2)The elastic modulus of cuplock steel tubes randomly purchased in the local market has decreased to varying degrees compared with the new,with a maximum decrease of about 30%.(3)The failure order of cuplock joints is the horizontal tube,the bell shape cap,the standing tube,and the bowl shape socket.The failure of the joints occurred at the joint of the horizontal tube,where should be strengthened in the quality control.The relevant conclusions can provide a reference for determining the rotational stiffness of similar semi-rigid joints.

关 键 词：碗扣式支撑架 钢管弹性模量 节点转动刚度 节点破坏特点 

分 类 号：TU755.2[建筑科学—建筑技术科学]