弯曲对初始不完善受压管道屈服强度的影响

Effect of Bending on the Yield Strength of Initially Imperfect Pressurized Pipelines

按Ｔｒａｓｃａ屈服准则，建立了同时考虑弯曲和初始非圆度影响时受压管道的初始屈服公式此式在压力单独作用下即退化成著名的ＳＴｉｍｏｓｈｅｎｋｏ公式文中对不同的弯曲及非圆度。

First-yield expressiones of initially imperfect pipelines subject to combined external pressure and bending loads are developed using a Trasca yield criterion.The expression can be reduced to a Timoshenko and Gere′s formula under pressure load alone.The imperfection is assumed to be small out-of-roundness.The influence of bending on yield pressure is studied for different initialovality.Some important results are obtained,which are valuble for the application of pipelines in design.