【摘要】 以某河床式水电站厂房为工程实例,采用有限元法,按照其实际尺寸建立混凝土蜗壳三维有限元模型,对蜗壳单体结构进行动力特性分析。对结构施加内水压力以及脉动压力,通过调整步长和迭代次数对结构进行时程运算,并采用结合Miner准则和S-N曲线的疲劳损伤及寿命估算方法,探讨了混凝土蜗壳结构的动力特性以及疲劳破坏规律。结果表明,混凝土蜗壳结构在脉动压力荷载作用下整体未产生疲劳破坏。所采用的疲劳分析法对水工大体积混凝土结构具有一定的适用性。更多还原

【Abstract】 Taking a river hydropower station powerhouse as an example,finite element method was used to establish a concrete spiral case three-dimensional finite element model according to its actual size,and the dynamic characteristics of the spiral case monomer structure was analyzed. Internal water and pulsation pressure were applied to the structure. By adjusting the step length and the number of iterations to do the time operation,and combining the rule of Miner,fatigue failure and life estimation method of S-N curve,the dynamic characteristics of the concrete spiral case structure and fatigue failure rule were discussed. The results show that the concrete spiral case structure does not cause fatigue failure under the pulsation pressure. The fatigue analysis method in this article has certain applicability to the hydraulic mass concrete structure.更多还原