考虑SSI效应的核电结构水平与竖向地震响应的耦合效应研究

Research of Coupling Effect of Horizontal and Vertical Seismic Response of Nuclear Structures Considering SSI Effect

本文通过振动台试验研究第三代核反应堆AP1000核安全壳模型水平与竖向地震响应的耦合效应,对该结构模型在单向和三向激励下的加速度响应进行了对比分析。分析结果表明,对于刚性地基:无隔震时,在结构频率附近,上部结构在三向地震输入下的加速度响应大于单向地震输入下的加速度响应;有隔震时,上部结构在三向地震输入下的加速度响应大于单向地震输入下的加速度响应。对土性地基来说:无隔震时,在2~10Hz范围内,上部结构在单向地震输入下的加速度响应大于三向地震输入下的加速度响应;有隔震时,在隔震系统频率附近,上部结构在单向地震输入下的加速度响应大于三向地震输入下的加速度响应。

Through a series of shaking table tests,the coupling effect of vertical and horizontal seismic response for the AP1000 nuclear power plant structure model is investigated.Acceleration response under 1D and 3D excitations is analyzed and compared.The analysis results show that the AP1000 structure model of nuclear power plant is divided into different subgrade response.For structures without isolation on the rigid foundation,the acceleration response under 3D excitation is greater than the acceleration response under 1D excitation near the structure frequency.For structures with isolation on the rigid foundation,the acceleration response under 3D excitation is greater than the acceleration response under 1D excitation.On the contrary,for structures without isolation on the soil foundation,the acceleration response under 1D excitation is greater than the acceleration response under 3D excitation when the frequency ranges from 2~10 Hz.For structures with isolation on the soil foundation,the acceleration response under 1D excitation is greater than the acceleration response under 3D excitation around the frequency of the isolation system.