PCCP管承插口力学性能与失效模式仿真分析

Mechanical Properties and Failure Mode Simulation Analysis of Joints in PCCP

预应力钢筒混凝土管(PCCP)承插口接头是易发生破坏的位置。为了研究承插口在发生相对转角时的受力特性与失效模式,基于非线性有限元建立了PCCP承插口精细化三维模型,结合承插口处各材料应力分布与橡胶圈的滑出失效分析,研究了相对转角、接头间隙和配合间隙对承插口的影响。结果表明,当相对转角达到1.434°时,承插口会因橡胶圈的完全滑出而失效,且承插口处混凝土最易发生拉裂破坏;配合间隙的增加会使橡胶圈滑出量增大,但有助于减小各材料的应力;接头间隙的增加不利于承插口接头保护。研究结果可为PCCP管道设计、施工与维护提供依据。

The joint of prestressed concrete cylinder pipe(PCCP)is the most vulnerable location.In order to study the mechanical response and failure mode of the joint when the relative angle occurs,a refined three-dimensional model of the PCCP joint was established based on nonlinear finite element method.Combining the stress distribution of each material at the joint and the slip-out failure analysis of the rubber,the effects of the relative angle,joint gap,and the fit clearance on the joint were studied.The results showed that when the relative angle reached 1.434°,the joint would fail due to the rubber slipping out completely,and the concrete at the joint was the most vulnerable to tensile cracking.The slip out of the rubber would increase with the development of fit clearance,but it would help reduce the stress of each material.The increase of the joint gap was not conducive to the protection of the joint.The research results can provide basis for the design,construction and maintenance of PCCP.