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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 radial stiffness of the welded pipe joints is generally much smaller than the axial stiffness of the pipe, so the site of failure under static forces is often located on the surface of the main pipe close to the weld. In order to improve the bearing capacity of the pipe joints, the method of setting the vertical flapper inside the main pipe near the joint can be used to improve the static strength of the pipe joints. The finite element method was used to simulate and analyze the static failure process of 33 reinforced and non-strengthened T-joints. The stress evolution process of the node area and the built-in insert during static loading was investigated. Through the study of the parameters of the model, it is found that the length of the insert has a great influence on the static strength of the joint, and the static strength of the joint increases with the increase of the length of the insert, but the effect is not obvious when the length reaches a certain value. The thickness of the plug-in board has little effect on the improvement of the static strength of the joint, but the thickness of the plug-in board should not be too small to prevent the plug-in board from instability damage before the node can play a significant reinforcing effect. Finally, the finite element simulations of the T-shaped nodes with different sizes before and after the built-in vertical flapper are carried out. The effect of the recommended size of the flapper on the node bearing capacity is studied.