内衬涂塑预应力钢筒混凝土管应力分析  

STRESS ANALYSIS OF PRESTRESSED CONCRETE CYLINDER PIPE WITH PLASTIC COATED STEEL LINER

作　　者：冯若愚[1] 陈瑛[1] 雷海鹏[1] 

机构地区：[1]山东大学土建与水利学院,济南250061

出　　处：《力学与实践》2016年第2期158-163,共6页Mechanics in Engineering

基　　金：国家自然科学基金(50779032);山东大学2015年校级大学生创新基金(2015247)资助项目

摘　　要：传统预应力钢筒混凝土管(prestressed concrete cylinder pipe,PCCP)容易开裂、预应力丝锈蚀而爆管失效.提出了耐腐蚀内衬涂塑钢筒预应力混凝土管(prestressed concrete cylinder pipe with plastic,PCCP-P),建立了PCCP-P线弹性轴对称分层圆筒平面应变模型,考虑预应力引起的内部径向压力,针对喷射砂浆保护层在管道预制阶段不受力以及缠丝、运行阶段混凝土弹性模量不同的特点,对PCCP-P分阶段进行分析,得到各结构层的应力解析解,并建立有限元模型进行验证.本研究可为PCCP-P和传统PCCP设计提供依据.Catastrophic ruptures of the prestressed concrete cylinder pipe（prestressed concrete cylinder pipe,PCCP） due to corrosion of pre-stressed steel wires after cracking are very common. A new structural form of the PCCP with corrosion-resistant plastic coated steel liner（prestressed concrete cylinder pipe with plastic,PCCP-P） is proposed. A mechanical model based on the elastic plane strain theory for axisymmetric multilayer cylinders is established, with the radial pressure due to the pre-stressing at an intermediate radial position being taken into consideration. The mortar coating is not involved in the load bearing during construction, and the modulus of elasticity of the concrete varies during the precast stage and the operation stage, therefore, the analysis of the stress distribution in different layers is divided into several stages. The solutions obtained are consistent with the results of the finite element analysis. These study results can be used for analysis, especially in the design of the PCCP-P and the PCCP.

关 键 词：预应力钢筒混凝土管 喷射砂浆保护层 分层圆筒 

分 类 号：O39[理学—工程力学]