Simple Beam Model to Estimate Leakage in Longitudinally Cracked Pressurized Pipes
Simple Beam Model to Estimate Leakage in Longitudinally Cracked Pressurized Pipes
复制标题
用于估算纵向裂纹加压管道泄漏的简单梁模型
DOI：
10.1061/(asce)st.1943-541x.0000535
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
F. Ubertini
中科院分区：
文献类型：
--
作者：
S. Miranda;L. Molari;G. Scalet;F. Ubertini
在世界各地的许多城市，供水系统的损失已达到令人震惊的程度。由于这些系统的老化和恶化，泄漏通常是水损失的主要原因，并且已经证实压力在水损失管理中起关键作用。本文提出了一个简单的分析模型的基础上的梁与弹性约束，以估计泄漏面积（从泄漏然后估计）在纵向裂纹压力管道和评估的影响，压力上的裂纹的开口面积。该模型的三维有限元分析的结果进行校准，然后通过实验结果进行验证。验证已进行了广泛的管道制成的不同材料（PVC，铸铁，石棉水泥，钢）的半径范围从27.5至110毫米，厚度从1.5至12毫米，裂纹长度从50至200毫米。梁模型，尽管它的简单，提供了可靠的泄漏评估纵向开裂的压力管道。
Losses from water distribution systems are reaching alarming levels in many cities throughout the world. Leakage is often the principal cause of water loss because of aging and deterioration of these systems, and pressure has been verified to assume a key-role in water-loss management. This paper presents a simple analytical model based on a beam with elastic constraints to estimate the leak area (from which the leakage is then estimated) in longitudinally cracked pressurized pipes and to evaluate the effect of pressure on the opening area of the crack. The model is calibrated on the results of a three-dimensional finite-element analysis and then validated by experimental results. The validation has been carried out for a wide range of pipes made of different materials (PVC, cast iron, asbestos-cement, and steel) with radii ranging from 27.5 to 110 mm, thicknesses from 1.5 to 12 mm, and crack lengths from 50 to 200 mm. The beam model, notwithstanding its simplicity, provides reliable leakage evaluations in longitudinally cracked pressurized pipes.