Improved Thrust Restraint Design Considering Displacement of Pipe Bend and Joint Separation
Improved Thrust Restraint Design Considering Displacement of Pipe Bend and Joint Separation
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考虑弯管位移和接头分离的改进推力约束设计
DOI：
10.1061/jpsea2.pseng-1306
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发表时间：
2023
影响因子：
2
通讯作者：
Kawabata Toshinori
中科院分区：
文献类型：
--
作者：
Ohta Yoko;Sawada Yutaka;Kitada Megumi;Kawabata Toshinori
目前的压力管道弯管设计中，一般以推力和阻力的平衡来评价弯管的稳定性，而没有考虑弯管本身的特性。用于预测弯管位移的力-位移（F-D）关系在弯管设计中包括管接头的性能，并将设计方法转变为基于性能的方法。然而，F-D关系仅在平面应变条件下提出。弯管的行为不能在二维中表示。因此，本研究将埋地结构F-D关系的预测方法推广到三维条件，以改进推力约束弯管的设计方法。在干砂中进行了刚性推力块和柔性推力块加土工格栅和碎石的推力约束水平加载试验，研究了刚性和柔性推力块的侧向特性，获得了不同推力块尺寸下的F-D曲线。实验结果表明，只要推力约束器的尺寸合适，柔性推力约束器的变形对侧向阻力的影响不大。利用实验结果，基于双曲线建立了F-D关系。所提出的方程能够预测阻力相对较好地在小的横向位移。除了公式化的F-D关系，一个新的设计程序，考虑管道的位移和性能的管接头，通过结合所提出的F-D预测方法和在以前的研究中提出的接头分离模型。
The stability of pressure pipe bends is evaluated by the equilibrium between the thrust force and resistance forces in the current design, and the behavior of pipe bends is not considered. Force–displacement (F–D) relationships, which are used for predicting the displacement of pipe bends, include the performance of pipe joints in the design of pipe bends and shift the design method to a performance-based approach. However, F–D relationships have been proposed only under plane-strain conditions. The behavior of pipe bends cannot be represented in two dimensions. Therefore, in this study, the prediction method of the F–D relationship for buried structures is extended to a three-dimensional condition to improve the design method of pipe bends with thrust restraint. Lateral loading experiments on thrust restraint, using rigid thrust blocks and flexible thrust restraints with geogrids and gravel, were conducted in dry sand to investigate the lateral behavior of rigid and flexible thrust restraints and to obtain F–D curves with different dimensions of thrust restraint. The experimental results revealed that the deformation of the flexible thrust restraint had little effect on the lateral resistance force if proper dimensions of the thrust restraints were determined. Using the experimental results, the F–D relationship was formulated based on a hyperbolic curve. The proposed equations were able to predict the resistance force relatively well at small lateral displacements. In addition to the formulation of the F–D relationship, a new design procedure considering the pipe displacement and performance of pipe joints was developed by combining the proposed F–D prediction method and the joint separation model proposed in previous studies.
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