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通过对设置黏滞流体阻尼器的半柔性悬挂结构进行地震模拟振动台试验,分析了主结构与悬挂楼面的质量比、连接方式、阻尼器的分布和层间斜撑对悬挂结构动力特性和响应的影响。试验结果表明:采用阻尼器连接主结构和悬挂楼面,可改变结构频率和振型阻尼比;当悬挂楼层侧向刚度较小时,结构振型表现为柔性层与悬挂楼面的耦合剪切变形;当增设斜撑后,结构第一振型为柔性层的层间变形;阻尼器连接时模型的主结构地震响应小于刚性连接的普通悬挂结构,通过增设斜撑可进一步提高减振效果;与自由悬挂结构相比,采用阻尼器连接的悬挂减振结构能够较好地抑制悬挂楼面相对于主结构的位移和悬挂楼面的层间位移;设置斜撑后,能够进一步减小悬挂楼面的层间位移,同时弱化了阻尼器不均匀对减振效果的影响。
Through the seismic simulation shaking table test of semi-flexible suspended structure with viscous fluid damper, the mass ratio of main structure to suspended floor, the connection mode, the distribution of dampers and the dynamic characteristics of suspension between slant- The impact of the response. The experimental results show that the damper structure can be used to change the structure frequency and mode shape damping ratio when the damper is used to connect the main structure with the suspended floor. When the lateral stiffness of the suspended floor is small, the mode shape of the structure is the coupling shear deformation of the flexible floor and the suspended floor When the bracing is added, the first vibration mode of the structure is the interlayer deformation of the flexible layer. The seismic response of the main structure of the model when the damper is connected is smaller than that of the rigid suspension. By adding the bracing, the vibration damping effect can be further improved. Compared with the free-hanging structure, the dash-damping structure connected by the damper can better restrain the displacement of the suspended floor relative to the main structure and the floor displacement of the suspended floor; after the bracing is provided, the dangling suspension can be further reduced Layer displacement, while weakening the uneven damping effect on the damping effect.