摘要
针对某一大型水电站泄洪闸闸墩在其泄洪过程中出现的强烈振动情况,系统地开展了闸墩原型振动测试、振动响应数值模拟预测与运行安全评价研究。首先,对常遇洪水工况下的泄洪闸闸墩进行了原型振动测试,提取了闸墩结构在不同运行工况下的泄洪振动时域和频域特征;其次,基于重力相似准则,研制了闸墩整体水力学荷载测试模型,对非常洪水工况和常遇洪水工况下闸墩的整体水动力荷载进行了测试,分析了不同洪水工况下的整体水动力荷载特性;然后,以模型试验所获取的整体水动力荷载时程线作为输入,进行了闸墩振动响应数值模拟计算,与原型观测工况结果进行了对比验证,并对非常洪水工况下闸墩的最大振动响应进行了预测;最后,对闸墩的泄洪振动进行了安全评价。结果表明,泄洪闸闸墩过大的振幅使其产生疲劳破坏的可能性很大,且不利于运行人员的正常操作,建议对闸墩进行抗振加固。
For the serious vibration state of a large hydropower station sluice pier under the flood discharge condition,the systematic study of the pier prototype vibration test,the numerical prediction of the vibra-tion response,and an operational safety evaluation are carried out.Firstly,the sluice pier prototype vibration test is executed,and the pier dynamic characteristics of the time and frequency domains are extracted under the frequent flood condition.Secondly,the whole hydro-dynamic load test model is set up based on the gravity similarity criterion,and the pier whole hydrodynamic load is tested and analyzed under abnormal flood and frequent flood conditions.The hydrodynamic load schedule lines obtained from this test are used as input to calculate the numerical flow-induced vibration of the pier.These results are compared with those of the prototype test.Then,the maximum vibration response of the pier is predicted under the abnormal flood condition.Lastly,the flow-induced vibration safety of the pier is evaluated.The results show that the large vibration amplitude can induce fatigue damage to the sluice pier,and is not conducive to normal staff operation.The suggestion for anti-vibration reinforcement of the pier is put forward.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2014年第5期938-946,981-982,共9页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(51269019
51469015
50909049)
天津大学水利工程仿真与安全国家重点实验室开放研究项目(201206)
江西省教育厅科技项目(GJJ12030)
江西省水利厅科技资助项目(KT201234)
关键词
闸墩
原型振动测试
水力学试验
数值预测
安全评价
sluice pier
prototype vibration test
hydraulics experiment
numerical prediction
safety evaluation
