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本文结合工程实例建立了ANSYS有限元空间分析模型,研究了不同频率比情况下,动力相互作用对设备、结构动力响应的影响,旨在为工程抗震设防提供设计依据。分析结果表明:在Kobe波、El Centro波和人工波作用下,当设备频率与结构1阶频率接近时,结构的动力响应会减小而设备的动力响应显著增大;设备动力响应增大的原因是输入激励主频与设备频率重合或接近所致。进行设备的抗震设计时,应尽量避开设备-结构频率比η在0.8~1.2这一共振敏感区。
In this paper, the ANSYS finite element analysis model is established with engineering examples to study the influence of dynamic interaction on the dynamic response of equipment and structure under different frequency ratios, aiming to provide the design basis for the seismic fortification of the project. The results show that under Kobe wave, El Centro wave and artificial wave, the dynamic response of the structure decreases and the dynamic response of the device increases significantly when the device frequency is close to the first order frequency of the structure. The dynamic response of the device increases The reason is that the input excitation frequency coincides with or close to the device frequency. Seismic design of the equipment should be avoided as far as possible equipment - structure frequency ratio η 0.8 ~ 1.2 in the resonance-sensitive area.