摘要
焊接圆钢管节点主管的径向刚度一般远小于支管的轴向刚度,因此在静力作用下发生破坏的部位常位于主管表面靠近焊缝处。为了提高管节点的承载能力,可采用在靠近节点部位的主管内部设置竖向插板的方法提高管节点的静力强度。利用有限元方法对33个加强与未加强的T节点的静力破坏过程进行了模拟和分析,调查了节点区域和内置插板在静力加载过程中的应力演变过程。通过模型的参数研究发现:插板的长度对节点的静力强度影响较大,随着插板长度的增加,节点的静力强度提高,但长度在达到一定的数值后提高效果不再明显;插板的厚度对节点的静力强度的提高效果不大,但插板的厚度不宜过小,防止插板先于节点产生失稳破坏而起不到显著的加强效果。最后,对24个不同尺寸的T型节点分别进行了内置竖向插板加强前和加强后的有限元模拟,研究了推荐尺寸的插板对节点承载力的提高效果。
The stiffness of the chord in radius direction is much weaker than that of the brace members in axial direction, as a result, failure occurs easily at the weld toe on the chord surface when a tubular joint is subjected to static loads. To improve the bearing capacity of tubular joints, the vertical inner plate can be placed inside the chord to increase the stiffness of the chord. Using the finite element method, overall 33 T-joint models with or without reinforcements are modeled and analyzed, and the stress development of the inner plate and the joint region is investigated. It is found from the parametric study that the length of the inner plate has great influence on the static strength of joints. The ultimate strength of a tubular joint increases remarkably as the length of the vertical inner plate increases. However, the growth rate of the static strength becomes much slower after the length of the inner plate exceeds certain values. Basically, the thickness of the inner plate has less effect on the improvement of the static strength of a tubular joint, yet it can not be too small to prevent buckling. At last, 24 geometrically different T-joints with or without vertical inner plates are analyzed, and the strengthening effect is evaluated through a comparison between the unreinforced model and the reinforced model.
出处
《工程力学》
EI
CSCD
北大核心
2010年第4期133-140,共8页
Engineering Mechanics
基金
国家自然科学基金项目(50808153)
关键词
管节点
竖向内置插板
静力强度
应力演变过程
参数分析
tubular joints
vertical inner plate
static strength
stress development
parameters analysis
