人民黄河
人民黃河
인민황하
Yellow River
2014年
3期
138-140
,共3页
预应力钢丝%断丝%PCCP%有限元分析
預應力鋼絲%斷絲%PCCP%有限元分析
예응력강사%단사%PCCP%유한원분석
prestressed steel wires%broken wires%PCCP%finite-element analysis
为考察预应力钢丝断丝后PCCP性能，基于ANSYS建立PCCP有限元模型，并对有限元模型从制造、施工到断丝运行的全过程进行分析。结果表明：有限元分析结果和美国标准C304相差不大；施工过程中，对混凝土管芯而言，最易发生裂缝的区域有内层管芯内侧管顶及包角部位和外层管芯外侧管腰部位，对钢筒而言，在管芯混凝土开裂前其应力变化不大；当断丝率≤10％时，其开裂内水压力及破坏内水压力变化不大，当断丝率＞10％时，在预应力等荷载综合作用下管道结构已无法继续承载。
為攷察預應力鋼絲斷絲後PCCP性能，基于ANSYS建立PCCP有限元模型，併對有限元模型從製造、施工到斷絲運行的全過程進行分析。結果錶明：有限元分析結果和美國標準C304相差不大；施工過程中，對混凝土管芯而言，最易髮生裂縫的區域有內層管芯內側管頂及包角部位和外層管芯外側管腰部位，對鋼筒而言，在管芯混凝土開裂前其應力變化不大；噹斷絲率≤10％時，其開裂內水壓力及破壞內水壓力變化不大，噹斷絲率＞10％時，在預應力等荷載綜閤作用下管道結構已無法繼續承載。
위고찰예응력강사단사후PCCP성능，기우ANSYS건립PCCP유한원모형，병대유한원모형종제조、시공도단사운행적전과정진행분석。결과표명：유한원분석결과화미국표준C304상차불대；시공과정중，대혼응토관심이언，최역발생렬봉적구역유내층관심내측관정급포각부위화외층관심외측관요부위，대강통이언，재관심혼응토개렬전기응력변화불대；당단사솔≤10％시，기개렬내수압력급파배내수압력변화불대，당단사솔＞10％시，재예응력등하재종합작용하관도결구이무법계속승재。
Through the analysis of the finite element models from the stage of manufacture and construction to broken wire running which built by ANSYS,PCCP’s performance had been examined after broken wires. The results show that there’s difference between the finite-element analysis and American Standards in the manufacturing processs;in the construction process,for concrete die the inside core top and outside tube waist of in-ner core are more easily to appear cracks,the stress of cylinder has a little change. The cracking internal pressure and the destroy internal pressure have little change when the rate of broken wires are less than or equal to 10 percent. Under the action of prestressed and other loads the structure of pipe can’t be used to bear loads when the rate of broken wires is more than 10 percent.
