摘要
总结并分析了国内外圆钢管T型相贯节点平面外弯曲试验研究和理论研究现状。研究表明:相贯节点平面外弯曲延性发展较大,相贯节点局部变形与节点面外弯矩之间初始阶段呈线性关系,结构整体分析可以按线弹性考虑。以线弹性为基础,某工程为背景,对圆钢管T型相贯节点平面外弯曲进行了有限元分析。用壳单元模型考虑节点局部变形影响,用管单元模型考虑节点为刚接,根据两种模型计算结果得到了节点平面外弯曲刚度值。为直观理解节点面外弯曲刚度,提出了等效支管长度的概念。通过改变支管厚度、支管外径和主管厚度等参数,研究了面外弯曲刚度、等效支管长度的变化规律,并对某工程实例进行了面外弯曲刚度和等效支管长度的计算分析。研究表明:节点面外弯曲等效支管长度可达到5~10倍支管外径,节点局部变形对支管弯曲刚度影响较大;当T型节点支管受弯为主时,结构整体计算应考虑节点弯曲刚度影响。
The experimental research and theoretical research status of out-plane bending properties of unstiffened tubular T-joint of steel tubular structure are briefly summarized and analyzed.The experimental results show that the ductility of out-plane bending of unstiffened tubular T-joint is developed greatly,the local deformation of T-joint is linearly related to out-plane bending moment in the initial stage,and the overall analysis of the structure can be considered in terms of linear elasticity.Based on linear elasticity and an engineering background,the finite element analysis of out-plane bending of unstiffened tubular T-joints is carried out.The shell element model was used to analyze the influence of local deformation on the joints,and the pipe element model was used to analyze the joints as rigid joints.According to the calculation results of the two models,the bending stiffness out-plane of the joints was obtained.In order to understand the bending stiffness of joints intuitively,the concept of equivalent branch pipe length is proposed.By changing the branch pipe thickness,branch pipe diameter,main pipe thickness and other parameters,the variation rules of outplane bending stiffness and equivalent length of branch pipe are studied,and the out-plane bending stiffness and equivalent length of branch pipe are calculated and analyzed for an engineering example.Research shows that the equivalent length of the branch pipe out-plane can reach 5~10 times of the branch tube diameter,the local deformation of T-joint has a great influence on the bending stiffness of the branch pipe.In the structure analysis when the branch tube is mainly bended,the bending stiffness of T-joint should be considered.
作者
尚仁杰
侯兆新
SHANG Renjie;HOU Zhaoxin(Central Research Institute of Building and Construction Co.,Ltd.,MCC Group,Beijing 100088,China)
出处
《结构工程师》
2021年第5期65-72,共8页
Structural Engineers
基金
国家重点研发计划项目(2017YFC0703800)。
关键词
T型相贯节点
面外弯曲刚度
等效支管长度
节点抗弯性能
有限元法
unstiffened tubular T-joint
bending stiffness out-of-plane
equivalent length of branch pipe
flexural properties of joint
finite element method
