核设备设计地震动包络标准PSD的拟合及试验研究

Simulation and test of design ground motion for nuclear equipment with standard PSD envelopment

核设备的抗震设计是核电厂抗震领域的一个重要问题,为了实现核电厂设备典型反应谱(RRS)匹配和标准功率谱密度(PSD)包络的设计地震动拟合,提出了一个标准PSD生成方法,该方法基于2014版《标准审查大纲》(SRP)建议的核电厂厂址设计地震动拟合方法,考虑迭代相关及随机相位谱对迭代收敛效率的影响,并通过在传统频域法拟合人工波过程中控制傅里叶幅值的手段实现了RRS匹配和标准PSD包络的人工地震波合成,为核设备抗震设计的楼面地震波提供了检验依据。选择压力容器作为核设备抗震研究的原型,通过振动台模型试验对比试件的响应峰值参数以及响应加速度时程的功率谱密度函数,验证了同时匹配RRS及包络PSD的人工地震动会激励设备更大响应的理论,说明了在设计地震动拟合中包络PSD要求的意义与重要性,认为可以作为设计过程中非强制的建议条件。

The seismic design of nuclear equipment is an important topic in the anti-seismic field of nuclear power plants.In order to achieve the ground motions fitting design of nuclear power plant equipment to meet the requirements of the typical response spectrum(RRS)matching and the standard power spectral density(PSD)envelope,a standard PSD generation method based on the ground motion fitting method for nuclear power plant site design recommended in the 2014 edition of the Standard Review Program(SRP)is proposed,which considers the effects of iteration correlation and random phase spectrum on the iterative convergence efficiency.The method realizes the artificial seismic wave synthesis with RRS matching and standard PSD envelope by controlling the Fourier amplitude in the process of fitting the artificial wave in the traditional frequency domain method,which provides a test basis for the seismic wave of the floor of the nuclear equipment anti-seismic design.The pressure vessel is selected as the prototype for seismic research of nuclear equipment.And the theory that artificial ground motions matching RRS and envelope PSD will stimulate greater response of equipment is verified by the shaking table test comparing the response peak parameters of the specimen and the power spectral density function in response acceleration time history.It shows that the significance of enveloping PSD requirements in the ground motion fitting design,which can be used as a suggested requirement in seismic design process.