摘要
为保证实际运行中橡胶坝的结构安全,考虑坝体和水体流固耦合的相互作用,利用有限单元法计算了充水式橡胶坝的自振频率和周期,研究了不同坝高、内压比及上游挡水等对橡胶坝自振特性的影响。结果表明,充水式橡胶坝的振动为坝体的整体振动,自振频率较小,振动方向主要为顺河向;随着坝高的升高,坝体的基频变小,自振周期变大;随着内压比的增加,坝体的基频变大,自振周期变小;上游挡水时的自振频率较无水时的有明显降低,可为橡胶坝设计提供参考。
In order to ensure structure safety of rubber dam in actual operation,this paper calculates the natural vibration frequency and periodicity to study the vibration characteristics of the filling rubber dam,which considers fluid solid coupling and uses the finite element method.Then the influences of dam height,internal pressure ratio and upstream water on the vibration characteristics of rubber dam are analyzed.It is concluded that the vibration of the water filling rubber dam is the overall vibration of the dam body;the natural vibration frequency is small and the vibration direction is mainly longitudinal;with the increase of the dam height,the fundamental frequency becomes smaller and the vibration period becomes larger;with the increase of internal pressure ratio,the fundamental frequency becomes larger and the vibration period becomes smaller;when there is no water at the upstream,the vibration frequency is lower obviously.The result can provide reference for the design of rubber dam.
出处
《水电能源科学》
北大核心
2016年第5期88-90,共3页
Water Resources and Power
基金
国家"十二五"科技支撑计划(2012BAD10B02)
关键词
橡胶坝
自振特性
流固耦合
内压比
模态分析
rubber dam
natural vibration characteristics
fluid solid coupling
internal pressure ratio
modal analysis
