滚动环梁与滑移垫层并联隔震的立式储罐振动台试验研究

Shaking table experimental study on vertical tank with rolling ring beam and sliding cushion parallel isolation

以滚动环梁与滑移垫层并联隔震基础为研究对象,进行了1/4储罐模型的地震动振动台试验研究。研究分2种工况模式,即:土体垫层非隔震基础形式和滚动环梁与具有弹性变形材料的滑移垫层的并联隔震基础形式。详细介绍了罐体设计、缩尺理论、隔震装置设计、测点布置和地震波输入等情况。并对非隔震和并联隔震模型的罐壁加速度,罐壁位移和罐壁应变对比得出了基本的结论。试验证明:并联隔震比非隔震具有更好的隔震效果,在ElCentro波作用下,储罐罐壁加速度峰值减小了25%;金门波作用下减小了13%;Taft波作用下减小了40.98%;Pasadena波作用下可减小66.6%。在罐壁下部应力也有较好的减震率,可有效减少象足屈曲等破坏。

In this paper, the newly-designed rolling ring beam and sliding cushion parallel isolation foundation is taken as the research object, and the ground motion shaking-table test of storage tank in 1/4 scale is carried out. The research included three working modes, namely: pure rolling ring beam base isolation, rolling ring beam and soil-cushion foundation form and the basic form of rolling ring beam and sliding-cushion with elastic deformation material. The tank design, scale theory, isolation device design, measuring arrangement and seismic wave input are introduced in detail. Basic conclusions were made on tank wall acceleration, tank skin displacement and tank skin strain for non- isolation and parallel isolation models. Tests have shown that parallel isolation has better isolation effects than non-isolation: under the action of El Centro wave, the peak acceleration of the isolated tank skin is reduced by 25%;under the action of the Golden Gate wave, it is reduced by 13%;under the action of Taft wave, it is reduced by 40.98%;under the action of the Pasadena wave, it can be reduced by 66.6%. The strain in the lower part of the tank wall also has a good shock absorption rate, which can effectively reduce the damage such as buckling.