Development of finite element model for analysis of prestressed concrete cylinder pipe-embedded cylinder pipe with experimental comparison.

摘要

Prestressed Concrete Cylinder Pipe (PCCP) is a composite pipe that consists of concrete and steel, which has layers of concrete core, steel cylinder, prestressing wire and mortar coating. PCCP is generally constructed of two types; a steel cylinder lined with a concrete core and a steel cylinder embedded in a concrete core. The former type is called PCCP-Lined Cylinder Pipe (PCCP-LCP) and the latter type is called PCCP-Embedded Cylinder Pipe (PCCP-ECP). The scope of this paper is limited to PCCP-ECP.;PCCP-ECP is a composite material with complex stress phenomenon due to prestress and interaction between different layers of components. A three dimensional non-linear finite element model is generated by using Abaqus version 6.12-2, a program that is well suited for non-linear finite element modeling, to simulate the real pipe behavior. The PCCP-ECP is modeled by considering the contribution of each components and manufacturing process. The hexahedron mesh, which is popular for accuracy and convergence, is used to model the elements. The simultaneous effect of shrinkage, creep, and relaxation are considered. Negative temperature is applied to simulate the shrinkage and creep of concrete. Also, time dependent property is defined to simulate the relaxation of prestressing wire.;Two full scale experiments, three edge bearing tests, were conducted to determine the real ECP behavior. The three edge bearing test was also simulated by using three dimensional non-linear analysis on the modeled PCCP-ECP. The comparison of results obtained from experiment and finite element modeling is done, which shows good agreement between the results. The PCCP-ECP model can be used for analysis for any loading case.