摘要
为比较不同强化方式空间多维方管桁架节点的力学性能,结合呼和浩特火车东站客运站的大跨度钢结构屋盖,对典型空间交汇的复杂方管桁架节点的承载力进行了计算.分别考虑了节点核心区盖板加厚强化、主弦杆增设内加劲板强化和未强化3种节点,通过单调加载和低周往复循环加载,获得了3种节点的静力和滞回力学性能,并比较了3种节点的刚度、承载力和延性变化规律.计算中将微动力阻尼系数引入牛顿-拉普森方程,改善了局部屈曲等强非线性问题的收敛性.研究表明,内加劲强化使节点变形更均匀,但盖板加厚强化在满足实际工程设计要求的同时较内加劲强化容易处理,施工质量易于控制.
To compare the mechanical behaviors of multi-dimensional rectangular hollow section joints with different reinforced measures,the load-bearing capacity of a typical joint in the long-span steel structure roof of Hohhot eastern railway station was calculated and analyzed.Three kinds of joints,thickened cover plate joint,internal plate-stiffener joint and joint without reinforcement,were taken into account.Through numerical calculation,their static and hysteretic behaviors were obtained respectively by monotonic and reversed cyclic loadings,and their stiffnesses,load-bearing capacities and ductility variations were analyzed.In addition,low-speed dynamic damping factor was introduced into the Newton-Raphson equation to improve the convergence of high nonlinear problems such as local buckling.The research indicates that the deformation of the internal plate-stiffener joint is more uniform,however,compared with the internal plate-stiffener joint,the thickened cover plate joint is easy to operate and control the construction quality when they meet engineering requirements.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2010年第5期698-704,共7页
Journal of Southwest Jiaotong University
基金
国家科技支撑计划资助项目(2009BAJ28B01)
西南交通大学科研基金资助(2008No.2)
关键词
方管桁架
强化节点
承载力
滞回性能
微动力阻尼系数
rectangular hollow section truss
reinforced joint
load-bearing capacity
hysteretic behavior
low-speed dynamic damping factor
