核电厂反应堆地震加速度时程直接输入方法研究

Direct Input Method of Seismic Acceleration Time History for Nuclear Power Plant Reactor Analysis

基于ANSYS12.1研究了一种地震加速度时程的直接输入方法,该方法不同于以往的地震动输入方法,可以直接施加加速度时程,避免了直接位移激励法两次数值积分产生的数值误差,也可以避免大质量法产生的Rayleigh阻尼力。通过理论分析和数值计算2种手段,对地震加速度时程的直接输入方法与以往的直接位移激励法、一致加速度激励法、大质量法做了对比验算。结果表明,地震加速度时程的直接输入方法可在实际工程计算中应用。

Based on ANSYS12.1, this paper studies the direct input method of a seismic acceleration. This method can avoid the numerical error produced by two times of numerical integral and also avoid the Rayleigh damping force produced by large mass method. Through the theoretical analysis and numerical calculation, the direct input method of a seismic acceleration is checked and compared with the direct displacement excitation method, the uniform acceleration excitation method and the large mass method. The results show that the direct input method of a seismic acceleration can be applied in practical engineering calculation.