预应力钢筒混凝土管结构变形规律的原型试验研究Ⅰ:内压  

The prototype test study of prestressed concrete cylinder pipe structure deformation lawⅠ.The internal pressure

作　　者：窦铁生 程冰清[1,2] 胡赫 夏世法 杨进新[3] 张奇 

机构地区：[1]流域水循环模拟与调控国家重点实验室,北京100038 [2]中国水利水电科学研究院,北京100038 [3]北京市水利规划设计研究院,北京100044

出　　处：《水利学报》2017年第12期1438-1446,共9页Journal of Hydraulic Engineering

基　　金：国家自然科学基金项目(50979116);北京市科委重大专项课题(Z141100006014058)

摘　　要：为研究预应力钢筒混凝土管在极限内水压作用下的承载能力和破坏机理,对内径2.6 m埋置式预应力钢筒混凝土管原型管进行了内水压试验,试验在国内外首次采用BOTDA和FBG光纤传感技术,并将光纤在PCCP制造过程中植入钢筒表面,在加载过程中连续测试PCCP各层结构的应变响应。通过深入分析测试数据发现,试验管内压在0~1.8 MPa时管道受力均匀,各层结构变形较协调一致并共同抵御内压,内压大于1.8 MPa时砂浆和管芯混凝土发生开裂。钢筒和预应力钢丝在加压过程中的变形规律基本一致,屈服内水压力均为1.8 MPa。钢筒内侧管芯混凝土开裂后通过钢筒传递径向应力,内水压力由预应力钢丝承担。原型试验不但获得了PCCP各层结构在内水压力作用下的受载响应规律,确定了管体各层材料开裂和屈服荷载,而且为PCCP结构深层次的基础理论研究和工程应用提供了宝贵的试验资料。PCCP is a composite structure composed ofconcrete core, steel cylinder, prestressed wire and mortar coating; the internal pressure is the key load during PCCP project running. To study the limit bear- ing capacity and failure mechanism of PCCP under theinternal water pressure, a prototype hydrostatic pres- sure test was carried out on 2.6 m diameter embedded PCCP（ECP）. The test used BOTDA and FBG opti- cal 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, continuously tested the strain of PCCP each lay- er structure in the process of loading.Through in-depth analysis of test data, it isfound that test PCCP stressed uniformly during internal pressure of 0 - 1.SMPa,the deformation of each structure layer is coordi- nated and jointly sustained the internal pressure, mortar coating and concrete core start crack when the in- ternal pressure is greater than 1.SMPa, and both of cylinder and prestressed wire yield at the internal pres- sure of 1.SMPa. The full-scale testnot only obtained the loading response law of the PCCP layers structure under the internal water pressure, determined the cracking and yielding load of each layer structure, but al- so 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 原型试验 BOTDA FBG 承载力 

分 类 号：TV332[水利工程—水工结构工程]