裂缝对预应力钢筒混凝土管结构承载力的有限元分析研究

Finite element analysis investigation of cracks impact on structurual safety performance of PCCP

预应力钢筒混凝土管(PCCP)管芯在实际生产与施工中容易出现裂缝,当管芯出现裂缝时,影响管道承载能力,严重时甚至会造成管道爆裂,降低管道使用寿命。文章结合我国某大型调水工程建设中4 m管径的预存裂缝PCCP管道,通过三维有限元模拟研究裂缝管的管体承载能力及其影响,为预存裂缝的PCCP管道在实际工程中提供安全性方面的理论支撑。通过对工程中实际应用的直径4 m的裂缝原型管进行结构承载能力数值模拟分析计算,管芯混凝土纵向非贯穿性裂缝没有明显降低PCCP管道的承载力,但是贯穿性裂缝管降低PCCP管道的承载力较明显。建议工程中应禁止使用出现通长裂缝的PCCP管道,而对于带裂缝的PCCP管道,应在查明裂缝深度和长度后,降级使用,以确保输(供)水工程安全。

Cracks are easy to appear in the actual production and construction of PCCP concrete tube,as the pipeline cracks,carrying capacity of the pipeline will be affected,pipeline burst when seriously,life of pipeline will be reduced too.In this paper,the PCCP of the 4m pipe diameter in some Project in China is used to study the bearing capacity and affection of the fractured pipe through the three-dimensional finite element simulation,which provides the theoretical support for safety of the PCCP in the actual project.The bearing capacity of PCCP is reduced by calculating the bearing capacity of PCCP without significantly reducing the bearing capacity of PCCP,and the bearing capacity of PCCP is reduced obviously by the numerical simulation analysis of the structure bearing capacity of fractured arc tube with diameter of 4 m.The PCCP pipe for the occurrence of long cracks in the project should be prohibited,and for PCCP with cracks,the depth and length of the crack should be identified and degraded.