基于三维有限元的卜型月牙肋钢岔管设计及应力分析

以新疆某水电站高压岔管为例,采用三维有限元法，研究了岔管初拟体型方案及管壁厚度，对初拟体型方案进行了优化，选取较为合理的岔管体型及管壁厚度，计算了岔管及肋板初拟方案和优化方案关键节点应力，并绘制优化后最终体型的肋板及岔管应力云图。结果表明，优化后体型采用较薄壁厚，肋板应力提高，管壳应力降低，更好地发挥了肋板的作用，体型较为合理；优化后其应力值均在允许应力范围内，且有一定裕度，表明岔管体型设计及壁厚选择较为合理，较为真实地反映了岔管运行期的应力状态。

Bu-type Crescent Rib Steel Bifurcation Pipe Design and Stress Analysis Based on Three-dimensional Finite Element

Taking high-pressure bifurcation pipe of hydropower station in Xinjiang for an example, three-dimensional finite element method was used to study the bifurcation pipe size and wall thickness, and the early body-type scheme was optimized. By choosing reasonable bifurcation pipe size and wall thickness, the scheme of bifurcation pipe and ribbed slab were calculated, and the key node stress was optimized. Then the stress nephogram of the final optimization size of bifurcation pipe and ribbed slab were plotted. The results show that the optimized shape with relatively thin wall thickness, ribbed slab stress increased and the shell stress reduced, which better plays the role of the ribbed slab. The shape is reasonable. The stress value is in the allowed range and it has a certain margin, which shows that the bifurcation pipe size design and selection of wall thickness is more reasonable. So, it reflects the stress state of the bifurcation pipe during operation period.