CAJ | 학술논문

采用有限元方法模拟分析了南水北调中线工程南沙河倒虹吸在运行期温度变化引起的混凝土温度应力，研究了倒虹吸结构不考虑温度效应、考虑四季更替导致结构温升温降时截面的正应力变化规律。结果表明温升对倒虹吸结构内侧面受力状态具有改善作用，但使外侧面受力状态变差，温降则刚好相反。根据拉应力变化特点，建议倒虹吸底板、顶板和边墙采用曲线预应力筋设置方案。
채용유한원방법모의분석료남수북조중선공정남사하도홍흡재운행기온도변화인기적혼응토온도응력，연구료도홍흡결구불고필온도효응、고필사계경체도치결구온승온강시절면적정응력변화규률。결과표명온승대도홍흡결구내측면수력상태구유개선작용，단사외측면수력상태변차，온강칙강호상반。근거랍응력변화특점，건의도홍흡저판、정판화변장채용곡선예응력근설치방안。
The finite element method was utilized to analyze the concrete temperature stress of large inverted siphon across Nansha River in South-to-North Water Transfer Project during the operational period. The variation of normal stress affected by the rise and down of temperature during sea-sons or not were studied in the consideration of the inverted siphon without prestressing. The results show that the inner surface concrete stress of in-verted siphon will be improved because of the rise of temperature and the outer surface concrete stress will be worse. The effect by the down of tem-perature is inversed. According to the variation of normal stress,the feasible solution with curved strands in bottom board,roof board and side walls are advised.