Update to the Improved Approach for the Design of Thrust Blocks in Buried Pipelines
Update to the Improved Approach for the Design of Thrust Blocks in Buried Pipelines
复制标题
埋地管道止推块设计改进方法的更新
DOI：
10.1061/9780784480878.053
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
S. Rajah
中科院分区：
文献类型：
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作者：
Stephen Shumaker;Gina Cashon;Allen H. Cox;R. Conner;S. Rajah
2011年，ASCE埋地管道推力限制设计工作委员会（工作委员会）提交了一篇论文，详细介绍了推力块和推力限制系统设计的改进方法，以改进当前的实践。本文提出了两种合理的方法，“标准”和“简化”，为所有管道材料的推力块的设计，考虑到管道的容许移动，相邻管段和接头的结构完整性问题，土壤的特性，和适当的安全系数。已经注意到，ASCE（2011）中提出的改进方法的简化版本仍然需要对管道弯曲响应于弯曲运动和土壤侧向阻力的解析表示，特别是关于管道弯曲附近的第一段管道。这种解析表示法通常比设计工程师愿意用于简单推力块设计的方法更复杂。考虑到这一点，工作委员会进一步简化了2011年简化方法中使用的假设，并假设第一段管道刚性移动，两端的管道接头表现为轴向自由滑动和横向偏转的连接。这种简化允许“简化”分析使用更简单的方程，这些方程使用容易获得的参数，例如弯曲角度、第一段管道的长度、极限土壤承载阻力以及接头的可用延伸和偏转能力。本文介绍了经修订的简化方法，记录了所作假设的理由和限制，并举例说明了其用于普通推力座的应用。
In 2011, the ASCE Task Committee on Thrust Restraint Design of Buried Pipelines (Task Committee) presented a paper detailing an improved approach to the design of thrust blocks and thrust restraint systems to improve current practice. This paper presented two rational approaches, “standard” and “simplified”, for the design of thrust blocks for all pipe materials, by considering the tolerable movement of the pipe, the structural integrity concerns of the adjoining pipe segments and joints, the characteristics of the soil, and an appropriate factor of safety. It has been noted that the simplified version of the improved approach presented in ASCE (2011) still required analytical representation of the flexure of the pipe in response to the movement of the bend and to the lateral resistance of the soil, particularly with respect to the first piece of pipe adjacent to the pipe bend. Such analytical representation is usually more involved than a design engineer is willing to use for a simple thrust block design. Considering this, the Task Committee has further simplified the assumptions used in the 2011 simplified approach and assumes that the first piece of pipe moves rigidly, with the pipe joints on either end behaving as connections free to slide axially and to deflect transversely. This simplification allows the “simplified” analysis to use simpler equations using readily available parameters such as bend angle, length of the first piece of pipe, ultimate soil bearing resistance, and the available extension and deflection capability of the joint. This paper presents the revised simplified approach, documenting the justifications and limitations for the assumptions made, and an example of its use for a common thrust block application.