立式储罐钢筋环梁基础隔震模拟振动台试验研究

Simulation shaking table test of vertical storage tank with reinforcement ring beam base isolation

为降低储罐隔震基础的工程造价,构建出应用于储罐的钢筋环梁隔震基础。同时针对1 000 m3储罐,根据相似比理论设计1∶5缩尺模型,以隔震周期为0.5 s设计环梁隔震基础。选取四种不同频谱特性的地震波,采用振动台试验方法,对模型罐进行加速度、位移以及晃动波高等地震响应分析,并与储罐基础隔震基本理论和有限元数值仿真分析方法进行对比。结果表明:钢筋环梁隔震基础能够有效降低储罐的地震响应,但晃动波高有所放大;三向地震激励与单向地震激励相比,加速度地震响应明显放大,但对晃动波高影响较小。试验解、理论解和有限元解三者互相验证。建议储罐隔震设计应考虑三向地震激励的影响,但晃动波高可仅按水平地震作用计算。

To reduce the project cost of storage tank isolation foundation,reinforcement ring beam isolation foundation was constructed. According to the similarity theory,the 1∶ 5 scale model was designed to 1 000 m^3 tank and reinforcement ring beam isolation foundation with 0. 5 s isolation period was designed. Selecting four kinds seismic wave with different spectrum characteristics,the shaking table test method was adopted to analyze the model tank earthquake response of acceleration,displacement and sloshing wave height. Test method was compared with the tank base isolation basic theory and the finite element method. The results showed that： reinforcement ring beam isolation foundation could effectively reduce the seismic response of the tank,but sloshing wave height was increased. Three dimensional earthquake excitation was compared with single-dimensional earthquake excitation,the seismic response of the acceleration was obviously amplified,and less influence to sloshing wave height. Test solution,the theoretical solution and finite element solutions were validated each other. Suggest the influence of three dimensional earthquake excitation should be taken into account when the isolation tank was designed,but sloshing wave height could be calculated only by horizontal earthquake action.