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钢筋混凝土底层柱顶隔震结构的底层通常为带拉梁框架柱和独立柱两种形式,为了验证这类结构的安全以及提出底层结构选型建议,开展了结构模型振动台试验,研究了底层为带拉梁框架柱和独立柱这两种结构在不同幅值地震作用下的加速度和位移响应,重点分析其底层结构的地震响应.试验原型为某实际结构中典型的一榀横向框架,制作安装了缩尺的两种柱顶隔震模型和对比的抗震模型.试验结果表明,两种隔震模型的上部楼层加速度和位移反应减震效果显著;底层加速度反应减震效果较差,而位移的减震效果尤为显著,表明按照GB 50011—2010《建筑抗震设计规范》的要求设计,强震下这类底层柱顶隔震结构是安全的.数值分析表明,当底层柱刚度减小至同抗震模型时,强震下独立柱出现较大的弹塑性变形,带拉梁框架柱比独立柱更有效地提高底层层间位移减震效果,建议工程应用中底层结构选取独立柱形式时,应加大其刚度.
In order to verify the safety of this type of structure and to put forward the suggestion of the selection of the bottom structure, the shaking table test of the structural model is carried out, and the ground floor of the basement isolation structure of reinforced concrete Is the acceleration response and displacement response of the two structures with tension beam frame column and independent column under different amplitude of earthquake, and the seismic response of the bottom structure is analyzed emphatically.The prototype is a typical horizontal frame in a practical structure, Two kinds of scale-mounted two-column roof isolation model and a comparison of the earthquake-resistant model are installed. The experimental results show that the acceleration and displacement responses of the upper floors of the two kinds of isolation models have significant damping effects. The results show that this kind of bottom column isolation structure is safe under the condition of strong earthquake.The numerical analysis shows that when the stiffness of the bottom column is reduced to the same When the seismic model is used, large elastic-plastic deformation occurs in the independent columns under strong earthquake. The beam frame with columns is more effective than independent columns to improve the displacement damping effect of the bottom layer. When engineering applications substructure independently selected column form, it should increase its stiffness.