三维倒虹吸结构动力响应分析
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摘要
倒虹吸结构广泛应用于我国农田水利建设、城市供水、大型调水工程中,很大一部分倒虹吸结构处于高烈度地震区,不可避免遇到抗震问题。考虑土与倒虹吸结构的相互作用,建立三维有限元模型进行静力分析,并在此基础上进行倒虹吸结构动力时程分析,研究倒虹吸结构在动力作用下的工作性态。通过比较加速度、位移及应力3方面的响应情况,发现地震作用下,加速度沿倒虹吸截面高度变化不大,y向位移相对x及z向较大,各向应力的增幅较小,7级地震作用下倒虹吸结构是安全的。
Inverted siphon structure is widely used in China's farmland water conservancy construction,city water supply,and large water diversion project. But seismic problems are inevitably encountered because a large part of inverted siphon structures are located in regions of high seismic intensity. A three-dimensional finite element model in consideration of the interaction between soil and inverted siphon structure is established to conduct static analysis. On this basis,the working performance of inverted siphon structure under dynamic action is researched through time-history analysis. By comparing the responses of acceleration,displacement and stress,we concluded that there is little change in the acceleration along the sectional height of inverted siphon,and the displacement in direction y is larger than that in direction x and z,and the increment of stress is not large in all directions. The inverted siphon structure is safe under earthquake of magnitude 7.
Inverted siphon structure is widely used in China's farmland water conservancy construction,city water supply,and large water diversion project. But seismic problems are inevitably encountered because a large part of inverted siphon structures are located in regions of high seismic intensity. A three-dimensional finite element model in consideration of the interaction between soil and inverted siphon structure is established to conduct static analysis. On this basis,the working performance of inverted siphon structure under dynamic action is researched through time-history analysis. By comparing the responses of acceleration,displacement and stress,we concluded that there is little change in the acceleration along the sectional height of inverted siphon,and the displacement in direction y is larger than that in direction x and z,and the increment of stress is not large in all directions. The inverted siphon structure is safe under earthquake of magnitude 7.
引文
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[2]王慧,李晓克,赵顺波.复杂地质条件下大型箱型倒虹吸动力响应研究[J].水力发电,2011,37(7):19-21.(WANG Hui,LI Xiao-ke,ZHAO Shun-bo.Dynamic Response of Large Box-shaped Inverted Siphon under Complex Geological Conditions[J].Waterpower,2011,37(7):19-21.(in Chinese))
[3]克拉夫.结构动力学(第二版)[M].彭津,王光远等译.北京:高等教育出版社,2006.(CRAIG R R.Fundamentals of Structural Dynamics(Second Edition)[M].Translated by PENG Jin,WANG Guang-yuan.Beijing:Higher Education Press,2006.(in Chinese))
[4]钱家欢,殷宗泽.土工原理与计算[M].北京:中国水利水电出版社,2003.(QIAN Jia-huan,YIN Zong-ze.The Principle and Calculation of Earthwork[M].Beijing:China Water Power Press,2003.(in Chinese))
[5]DL5073—2000,水工建筑物抗震设计规范[S].北京:中国电力出版社,2001.(DL5073—2000,Code for Seismic Design of Hydraulic Structures[S].Beijing:China Electric Power Press,2001.(in Chinese))
[6]王济.MATLAB在振动信号处理中的应用[M].北京:中国水利水电出版社,2005.(WANG Ji.Application of MATLAB in Vibration Signal Processing[M].Beijing:China Water Power Press,2005.(in Chinese))
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