关键词: 低温罐, 晃动波高, 长周期, 地震反应谱, 阻尼比

Abstract:

From the aspects of long-period seismic acceleration response spectrum, seismic displacement response spectrum and damping ratio, the calculation methods of sloshing wave height of cryogenic tank with different standard systems are analyzed and compared. It is concluded that under the same ground motion parameters, the sloshing wave height of cryogenic tank calculated according to Chinese standards is much higher than that of European and American standards. The main reason is that the long-period seismic acceleration response spectrum in China is high and does not conform to the statistical characteristics of seismic response spectrum. The corresponding suggestions are put forward. Continue to collect measured long-period ground motion parameters and optimize the long-period seismic acceleration response spectrum of existing standard. The optimization shall be effectively connected with the short and medium period of the existing seismic acceleration response spectrum. Taking the reliable long-period ground motion displacement as the input and considering the time history analysis of FSI, obtaining a more real liquid sloshing wave height. Seismic importance coefficient can be introduced into sloshing wave height calculation. Further define the liquid level calculation benchmark of sloshing wave height and the control value of tank wall free height under each waterproof standard. The overturning moment of the liquid sloshing part on the tank and civil foundation is analyzed and calculated in detail.

Key words: cryogenic tank, sloshing wave height, long-period, seismic response spectrum, damping ratio