AP1000核岛结构在主余震序列下的响应研究

Study on Response of AP1000 Nuclear Island Structure under Mainshock and Aftershcok

建立了AP1000核岛结构(屏蔽厂房和钢制安全壳)的ABAQUS有限元模型,将ABAQUS模态分析结果与既有研究成果和ANSYS计算结果对比,验证了AP1000核岛结构有限元弹塑性模型的正确性,取7条实际主余震序列型地震动,对比分析单主震地震动和主余震序列作用下的核岛结构三维震动响应。结果表明:在单主震和主余震序列作用下结构动力响应变化趋势基本相同,结构在主余震序列地震动作用下的动力响应大于单一主震,在不同的主余震序列地震动作用下,结构的位移峰值和加速度峰值的突变随着余震地震动强度的增大而增大,且结构随余震强度增大滞回耗能增长越明显,核岛结构的塑性损伤程度越大。

The ABAQUS finite element model of AP1000 nuclear island structure(shielded building and containment vessel)was established.In order to ensure the accuracy of the finite element model,the results of ABAQUS modal analysis were compared with those of existing research results and the results of ANSYS modal analysis.Select samples of sequence-type of seven actual main aftershocks and single main shock ground motions.The three-dimensional vibration response of the nuclear island structure under the action of the singlemainshock ground and the mainshock is compared and analyzed.The results show that the trend of structural dynamic response is the same under the action of single main and main earthquakes.The dynamic response of the structure under the vibration of main aftershock is greater than that of single main earthquake.In the sequence of different mainshock-aftershocks,the change of the displacement peak and the acceleration peak of the structure increases with the increase of the aftershock ground motion intensity,and the structure increases with the aftershock intensity the more obvious the increase of hysteretic energy consumption,the greater the degree of plastic damage.