汽轮机基础选型及结构抗震性能

Foundation Selection and Seismic Performance of Steam Turbine

为确定某核电汽轮机的基础形式以及明确其结构的抗震性能,本文通过LS-DYNA有限元程序建立了某汽轮机整体结构的三维有限元模型,就基础选型问题以及汽轮机整体的抗震性能进行了综合分析.结果表明:目前核电设备常选用的刚性基础和弹簧基础中,弹簧基础较刚性基础有更好的抗震性能,更适合作为该汽轮机的基础;采用弹簧基础作为该汽轮机的基础结构,在8度设防烈度多遇地震水准下,该汽轮机整体结构可以满足结构抗震要求,而在8度设防烈度罕遇地震水准下,该汽轮机部分结构变形过大且内力不满足自身强度要求及抗震要求,应加强相应结构的抗震性能.

To determine the foundation form and seismic performance of a nuclear steam turbine, this paper established a three-dimensional finite element model of integral structure of the turbine by using LS-DYNA finite element program and comprehensively analyzed the foundation selection problem and the overall seismic resistance of the turbine. The results show that in the rigid foundation and spring foundation of current nuclear power equipment, the spring foundation is more suitable to be used as the foundation of the nuclear steam turbine for its better seismic performance. When the spring foundation is chosen as the foundation of the nuclear steam turbine, the entire structure can meet the seismic requirements at frequently occurred earthquake of 8 degree seismic precautionary intensity. However, at rarely occurred earthquake of 8 degree seismic precautionary intensity, the seismic performance of the structure should be improved because the deformation of some structures of the steam turbine is too large and the internal force does not meet the requirements of its own strength and seismic requirements.