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某成品油管道由于洪水冲刷,形成了长约324m的悬管段。从基于应力的传统设计准则出发,对悬管段的受力状态进行评价,结果显示悬管段将会失效,与事实情况不符。从基于应变的设计准则出发,考虑管材的弹塑性变形能力,对悬管段的受力状态进行评价,结果显示悬管段处于安全状态,最大挠度为7.08m,与事实情况基本吻合。进一步对可能影响悬管段应变能力的因素进行分析,结果表明:基于应力的传统设计准则对悬管段的受力状态进行分析是非常保守的,为了充分发挥管材的塑性应变能力,应采用基于应变的设计准则。管材的应变硬化特性,例如屈服强度、抗拉强度、应变硬化指数等,对悬管段承受大应变的能力具有较大影响。
A product pipeline due to flood erosion, forming a length of about 324m hanging section. Based on the traditional design criteria based on stress, the stress state of the suspended section is evaluated and the results show that the suspended section will fail and is not in accordance with the actual situation. Based on the design criteria of strain, considering the elastic-plastic deformation ability of the pipe, the stress state of the suspended section is evaluated. The results show that the suspended section is in a safe state with the maximum deflection of 7.08m, which is consistent with the factual situation. Further analysis is made on the factors that may affect the strain-relief ability of the suspended section. The results show that the stress-based traditional design criterion is very conservative for analyzing the stress state of the suspended section. In order to fully exert the plastic strain ability of the pipe, strain- Design guidelines. The strain hardening properties of pipes, such as yield strength, tensile strength, and strain hardening index, have a significant impact on the ability of the suspended section to withstand large strains.