内衬管长度与冻结管的极限承载力关系研究

Relationship between Length of Inner Pipe and Ultimate Bearing Capacity of Freezing Pipe

对含内衬管的坡口对焊接头冻结管抗弯承载能力与变形进行了实验和有限元计算,实验结果验证了有限元数值计算是可靠的。把"回归正交试验分析法"引入到数值计算中,用较少的计算次数,计算出不同长度内衬管对坡口对焊接头冻结管承载力的影响。计算结果表明:冻结管直径越大,增加内衬管长度对提高冻结管承载力的影响越显著;对直径小于130mm的冻结管,增加内衬管长度对提高冻结管承载力的影响很小。同时,回归出内衬管长度与坡口对焊接头冻结管承载力之间的经验公式,计算结果与试验结果误差很小,可为冻结管接头设计提供理论依据。

The bending capacity and deformation of the butt groove welding freezing pipe with inner pipe are experimented and analyzed with the finite element program ANSYS. Experiments show that the finite element numerical computation is reliable. Then, the regressive orthogonal experimental analysis method is introduced in numerical computation; the bending capacity and deformation of the butt groove welding freezing pipe with inner pipe of various lengths are computed by fewer computational times. The calculation result shows that： the bigger the diameter of freezing pipe is, the greater influence increasing the length of inner pipe has on the increase of the bearing capacity of the freezing pipe. And increasing the length of inner pipe has an insignificant effect on the increase of the bearing capacity when the diameter of freezing pipe is lesser than 130mm. Finally, we returned an empirical formula between the length of inner pipe and the bearing capacity of the butt groove welding freezing pipe with inner pipe. The error between the calculation results and the experimental results are significant, so that it can provide a theoretical basis for the joint design of freezing pipe.