基于原型振动测试的泄洪闸闸墩动位移反演

Dynamic Displacement Inversion for Sluice Pier Based on Prototype Vibration Test

泄洪闸闸墩振动的动位移均方差是评估其振动危害程度的控制指标之一。为获取闸墩泄洪振动的整体动位移场,从而对泄洪闸闸墩进行全面振动危害评价,以某水电站泄洪闸为工程实例,针对该工程泄洪闸闸墩在宣泄洪水期间发生强烈振动导致无法正常运行的情况,开展了闸墩泄洪振动原型测试,并基于所观测的有限测点动位移,提出了基于粒子群优化算法(particle swarm optimization,简称POS)的闸墩整体动位移场反演方法。结果表明,仅利用闸墩顶部8个测点动位移响应就实现了该闸墩结构整体动位移场的反演,反演值与实测值拟合度较高。所提方法可为全面评价泄洪闸闸墩在宣泄洪水期间的振动安全提供有力支撑。

The mean square error of vibration displacement is one of control indexes of sluice pier′s vibration hazard assessment.In order to obtain the whole dynamic displacement field of the flood discharge vibration of the pier,this paper takes Shuhe hydropower station sluice pier as an engineering example to evaluate the comprehensive vibration hazard of the sluice pier.In view of the fact that the sluice pier has caused strong vibration during the flood discharge which leads to operate abnormally,the flood discharge vibration prototype test is carried out.Moreover,a method of inversion of the whole dynamic displacement field of the sluice pier is proposed based on particle swarm optimization algorithm and the limited measuring point displacement.The results show that the inversion of the dynamic displacement field of the sluice pier structure is achieved by using only eight points′dynamic response of the top of the sluice pier,and the fitting degree is higher between the inversion value and measured value.Therefore,it can provide a support for the comprehensive evaluation of vibration safety of sluice pier during flood discharge.