基于应变的管道强度设计方法的适用性

The applicability of strain-based pipeline strength design method

对比分析了基于应力和基于应变两种管道强度设计方法的实质内容、设计理念和适用性:来源于传统的材料强度理论的基于应力的管道强度设计方法是一种适用于在内压、温差等以力为控制参量的载荷作用下的弹性设计;来源于极限设计理念的基于应变的设计方法则是一种塑性设计,适用于一旦发生重大地质灾害,作用于管道上的载荷以位移作为控制参量。后者是在前者难以满足管道强度要求时采用的,是对前者的补充。提出了基于应变设计方法的适用条件及其需要注意的问题,对于我国今后在管道设计中采用该方法具有一定的指导作用。

This paper compares the essential substance,design concept and applicability of stress-based pipeline strength design with strain-based pipeline strength design.Results display that the stress-based pipeline strength design that originated from traditional material strength theory is an elastic design that under load with force as a control parameter,such as internal pressure,temperature difference,etc.,and the strain-based pipeline strength design that originated from limit design concept is a plastic design,applicable to the load with displacement as control parameters for major geological disasters,the latter is used when the former can not satisfy the strength requirements of pipelines,and is supplementary to the former.It puts forward the applicable conditions for strain-based design method and the problems that need attention,and has certain guiding significance for using this method in future pipeline design.