支架式球形储罐层间隔震分析

Simplified Model Research of Framed Spherical Tank Seismic Substructure

对于大型化和高参数化球罐的安全服役,层间隔震有着广泛的应用领域。但在支架式球形储罐结构中设置隔震层,可能会导致隔震层以及隔震层以下的结构地震反应变强。针对上述情况,建立了容积为1500 m^3,7层支架式球形储罐有限元模型。分别在5个位置设置隔震支座作为隔震层,对85%储液下隔震结构施加三向罕遇地震波,同无隔震及基础隔震结构对比,分析储罐在不同隔震层及不同地震下的动力响应。结果表明,基础隔震耗能效果整体较佳,层间隔震的耗能效果与隔震层位置和地震波的特性有关。有限元分析结果表明,将隔震层布置在第3层,整体结构隔震耗能效果最好。

Facing the safety problems of spherical tanks that develop to large scales and high parameters, mid-story seismic isolation has wide application field. But setting isolation layer in the framed spherical tank may lead to strong earthquake reaction on the parts of isolation layer and below the isolation layer. This paper took the 1500 m3 storage tank as a model ,established the spherical tank finite element model of 7-layer. Set isolation layer in five different positions, put three-directions rare earthquake-waves on the isolation layer structure with 85% liquid, comparing with base isolation structure, and free of isolation structure, analyzed the dynamic responses under the different isolation layers and different earthquakes. Result shows that energy absorption of isolation, not only relate to isolation layer positions, but also relate to the characteristics of earthquake waves. The energy absorption of base isolation is better. When the isolation layer was set in three layer, the damping effect is the best, comparing with another four layers.