摘要
为了揭示套管承插式节点的半刚性特性、计算方法及其对节点和脚手架承载力的作用规律,结合相关试验数据、数值仿真和理论分析,研究节点连接棒的伸入长度、连接方式对节点刚度产生的影响,以及节点刚度对脚手架承载力的影响.分析结果表明:连接棒的伸入长度对节点刚度有重要的影响.当连接棒长度小于12 cm时,节点刚度的大小会随着长度的增大而显著增大;长度超过12 cm后,节点刚度的大小基本保持稳定.另外,连接棒的连接方式也会对刚度产生重大影响.通过试验得到固定式节点的转动刚度大小比活动式的节点刚度提高11%;并且通过进一步模拟发现,采用三点焊接方式得到的节点刚度达到最大.最后选取5组节点刚度数据对脚手架进行仿真计算,得出节点刚度对结构极限承载力大小的影响能达到40%,证实竖向节点刚度对脚手架承载力有显著影响.
To reveal the semi-rigid characteristics and calculation method of the casing plug joint,and its impact on the bearing capacity of the scaffold,this paper combined the experimental data,theoretical analysis and numerical simulation to study the influence of insert length of joint bar,connection mode on joint stiffness as same as joint stiffness on scaffold bearing capacity.The results show when the insert length of joint bar is within 12 cm,the stiffness of the joint is determined by the change of the insert length of joint bar;when it exceeds 12 cm,the rotational stiffness of the joint reduced is not affected by the joint bar.In addition,the rotational stiffness of fixed joint is about 11%higher than that of active joint,which indicates that the connection type of the joint has a great influence on the stiffness.Through further simulation,it shows that the three-point welding method has the best joint stiffness.Finally,5 groups of joint stiffness data were selected to conduct simulation calculation on the scaffold structure,and it is found that the influence of joint stiffness on the ultimate bearing capacity of the structure could reach 40%,indicating that the joint stiffness has a significant impact on the bearing capacity of the scaffold.
作者
张漳荣
周继忠
姜绍飞
ZHANG Zhangrong;ZHOU Jizhong;JIANG Shaofei(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China;College of Civil Engineering,Fujian University of Technology,Fuzhou,Fujian 350118,China)
出处
《福州大学学报（自然科学版）》
CAS
北大核心
2020年第4期525-531,共7页
Journal of Fuzhou University(Natural Science Edition)
基金
福建省科技厅产学合作项目(2017Y4012)
福建省交通运输科技项目(201536)。
