水利学报2023，Vol.54Issue(12)：1430-1439,10.DOI:10.13243/j.cnki.slxb.20230412
PCCP断丝破坏规律Ⅰ:原型试验研究
Failure law of PCCP caused by broken wires Ⅰ:Prototype experimental study
摘要
Abstract
At present,the number of broken wires is the main factor considered in the structural performance as-sessment of prestressed concrete cylinder pipe(PCCP).Due to the gripping effect of mortar on broken wires,the initial size,extension timing,and extension amplitude of the range in each broken wire regaining its full tension are key indicators for studying the preservation of prestress in the core.Based on distributed fiber optic sensors,this paper presents four prototype experiments on the PCCPs with the same design parameters,focusing on wire breakage until failure,considering the effects of two wire-breaking types under three load types.The ultimate numbers(rates)of broken wires in the experiments of the clustered and scattered wire breakage under the constant internal pressure,scattered wire breakage under the cyclic internal pressure,and clustered wire breakage under the constant external load are 60(19.8％),185(61.1％),140(46.2％),and 150(49.5％),respectively.Ex-perimental investigation obtained numbers of broken wires corresponding to the damage of constituent materials and the final failure of pipes under different conditions,which revealed the laws of the prestress loss and failure of the core,highlighting key factors that should be considered when evaluating the structural performance of PCCP with broken wires.Furthermore,it provides a basis for developing a numerical method for simulating the wire-breaking process.关键词
PCCP/原型试验/集中断丝/离散断丝/循环内压/预应力损失/破坏Key words
PCCP/prototype experiments/clustered wire breakage/scattered wire breakage/cyclic internal pressure/prestress loss/failure分类
建筑与水利引用本文复制引用
窦铁生,董晓农,章煊,李炎隆,宁靖华,黎康平..PCCP断丝破坏规律Ⅰ:原型试验研究[J].水利学报,2023,54(12):1430-1439,10.基金项目
水利部重大科技项目(SKS-2022111) （SKS-2022111）
陕西省自然科学基础研究计划——引汉济渭联合基金项目(2019JLZ-14) （2019JLZ-14）
