水利学报2018，Vol.49Issue(2)：207-215,9.DOI:10.13243/j.cnki.slxb.20170465
预应力钢简混凝土管结构变形规律的原型试验研究Ⅱ:外压
The prototype test study of prestressed concrete cylinder pipe structure deformation law Ⅱ.The external pressure
摘要
Abstract
PCCP is a composite structure composed of concrete core,steel cylinder,prestressed wire and mortar coating,it is not only withstanding the internal water pressure,but also bearing the external load including the tube body weight,soil and water weight,live load and load from pile soil temporarily,the deformation law of PCCP under external load and the deformation law of PCCP under the internal load is completely different.The test used BOTDA and FBG optical fiber sensor technology for the first time both at home and aboard,and the optical fiber implanted steel cylinder surface in the PCCP manufacturing process.A three-edge bearing test was carried out on 2.6 m diameter embedded PCCP (ECP),continuously tested the strain response of PCCP each layer structure in the process of loading.Through in-depth analysis of test data,it is found that in the loading process of the three-edge test,the deformation of PCCP each layer structure is proportional to the external load,the concrete core outside of cylinder are in harmony with the wire in deformation,the deformation between the concrete core inside of the cylinder and the cylinder are coordinated fundamentally.The outer concrete core at the pipe waist and the wire are in tension,the inner concrete core at the pipe waist and the wire are in compression,concrete core at invert and crown is opposite,but the law of deformation coordination is consistent.The prototype test of external load not only obtained the loading response law of the PCCP layers structure,but also provided valuable experimental data for deeply basic theoretical research and engineering application of PCCP structure.关键词
预应力钢筒混凝土管/三点试验法/BOTDA/FBG/承载力Key words
prestressed concrete cylinder pipe/three-edge bearing test method/BOTDA/FBG/bearing capacity分类
建筑与水利引用本文复制引用
窦铁生,程冰清,胡赫,夏世法,杨进新,张奇..预应力钢简混凝土管结构变形规律的原型试验研究Ⅱ:外压[J].水利学报,2018,49(2):207-215,9.基金项目
国家自然科学基金项目(50979116) （50979116）
北京市科委重大专项课题(Z141100006014058) （Z141100006014058）
