...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Bulletin of earthquake engineering >Structural behavior of buried pipe bends and their effect on pipeline response in fault crossing areas
【24h】

Structural behavior of buried pipe bends and their effect on pipeline response in fault crossing areas

机译：埋地管弯曲的结构行为及其对故障交叉区管道响应的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Pipe bends, often referred to as "elbows", are special pipeline components, widely used in onshore buried steel pipelines. They are sensitive to imposed deformations and their structural behavior is quite flexible and associated with the development of significant stress and strain, which may lead to failure. In the present paper, the mechanical performance of buried steel pipeline bends is investigated first, using rigorous finite element models that account for the pipe-soil interface. Three 36-inch-diameter pipe elbows are considered, subjected to pull-out force and embedded in cohesive soils. The elbows have bend angles equal to 90 degrees, 60 degrees and 30 degrees, and bend radius-over-diameter ratio (R/D) equal to 5. The results show the increased flexibility of the pipeline bend with respect to the straight pipe, and are reported in the form of force-displacement diagrams. Furthermore the deformation limits of each elbow are identified in terms of appropriate performance criteria. The second part of the paper investigates the effect of pipe bends on the response of pipelines crossing active faults using a three-dimensional rigorous finite element model. The numerical results refer to a 36-inch-diameter pipeline crossing a strike-slip fault, and show that the unique mechanical response of pipe bends, in terms of their flexibility, may offer an efficient tool for reducing ground-induced deformations. The three-dimensional model employs the load-displacement curves of the first part of the paper as end conditions through nonlinear springs. Furthermore, the results show that there exist an optimum distance of the elbow from the fault plane, which corresponds to the maximum allowable ground displacement. Therefore, pipeline elbows, if appropriately placed, can be employed as "mitigating devices", reducing ground-induced action on the pipeline at fault crossings.
机译：钢管弯曲，通常被称为“肘部”，是特殊的管道组件，广泛用于陆上埋藏钢管。它们对施加的变形敏感，它们的结构行为非常灵活，与显着的压力和菌株的发展有关，这可能导致失败。在本文中，首先研究了掩埋钢管管道弯曲的机械性能，使用占管材界面的严格有限元模型。考虑三个36英寸直径的管锯，对外拉伸力并嵌入粘性土壤中。肘部具有等于90度，60度和30度的弯曲角，并且弯曲半径上直径比（R / D）等于5。结果显示了管道弯曲相对于直管的柔韧性，并以力 - 位移图的形式报告。此外，根据适当的性能标准识别每个弯头的变形极限。本文的第二部分研究了管道弯曲对流水线响应使用三维严格有限元模型的响应。数值结果指的是36英寸直径的管道，交叉滑动故障，并表明管道弯曲的独特机械响应，在它们的灵活性方面，可以提供有效的工具，用于减少地面引起的变形。三维模型采用纸张第一部分的负载 - 位移曲线通过非线性弹簧作为最终条件。此外，结果表明，来自断层平面的弯头的最佳距离，这对应于最大允许的地面位移。因此，如果适当放置的话，管道肘部可以用作“减轻装置”，减少故障交叉处的管道上的地面诱导的动作。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号