摘   要：以恒定内压下预应力钢筒混凝土管（PCCP）的离散断丝破坏原型试验为参照，在断丝过程中考虑了循环内压作用，模拟了频繁经历停水和再通水的管体遭遇持续断丝直至破坏的全过程，建立了基于整圈删除断丝的数值模型，并与试验结果进行了对比。结果表明：相较于恒定内压，循环内压会使钢丝断口的扩展时间显著提前，使离散断丝更早地环向汇聚；基于整圈删除断丝数值模型计算得到的管体破坏时的离散断丝数为130根，断丝率为42.9%；试验测得的循环和恒定内压下管体破坏时的离散断丝数分别140根和185根，断丝率分别为46.2%和61.1%。 Abstract: Based on the prototype test of discrete broken wire failure of prestressed concrete cylinder pipe(PCCP) under constant internal pressure, the cyclic internal pressure was considered during the wire breakage process. The entire process of the pipe body experiencing continuous wire breakage until failure due to frequent water stoppages and restarts was simulated. A numerical model based on whole circumference removal of broken wires was established and compared with the experimental results. The results show that compared to constant internal pressure, cyclic internal pressure significantly advances the extension time of the steel wire fracture, causing the discrete broken wires to converge in the circumferential direction earlier. The number of discrete broken wires during pipe failure calculated based on the numerical model of whole circumference removal of broken wires is 130, with a wire breakage rate of 42.9%. The number of discrete broken wires measured during cyclic and constant internal pressure pipe failure are 140 and 185, respectively, with wire breakage rates of 46.2% and 61.1%.

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