Failure law of PCCP caused by broken wires Ⅱ:Numerical simulation study
Numerical simulation of wire breakage in prestressed concrete cylinder pipes(PCCP)currently either removes the entire circle containing the broken wire or assumes a fixed range in each broken wire regaining its full tension,without considering whether this range due to mortar damage can be extended.This paper abstractly ana-lyzes the interaction mechanisms between the mortar,steel wires,and core concrete of PCCP,introduces the spring element,cohesive contact model,and concrete plastic damage model,proposes a full-process simulation method for prestressing the core concrete,cutting steel wires at arbitrary position,and forming an extendable range in each broken wire regaining its full tension,and clarifies the key parameters for regulating the initial size,extension timing,and extension amplitude of this range.Based on prototype tests,numerical models were estab-lished for clustered and scattered wire breakage under constant internal pressure,and the rationality of the new simulation method was verified from the perspective of the entire process from internal pressure loading to wire breakage failure.And these reveal the laws of the prestress loss and failure of the core,make it possible to simu-late various three-dimensional breakpoint distributions in practical engineering,and provide a new means for more accurate prediction and evaluation of the structural performance of the wire-broken PCCP.
万方数据
维普
