钢筋混凝土巨型框架结构及附单向TMD装置的减震结构振动台试验研究

Shaking table model test analysis of a reinforced concrete mega-frame structure without and with TMD

为了研究钢筋混凝土巨型框架结构体系的抗震性能及其地震作用损伤机理,设计制作1/25的缩尺模型,并设计加工了一套调谐质量阻尼器(TMD)装置安装在模型结构顶部,进行振动台试验,得到结构的动力特性和位移响应,并对比分析了TMD的减震效果。结果表明:当在峰值加速度为0.140g的地震波作用后(相当于原型7度多遇地震),模型结构处在弹性工作状态,在峰值加速度为0.400g的地震波作用后(相当于原型7度基本烈度),模型结构出现轻微破坏,在峰值加速度为0.880g的地震波作用后(相当于原型7度罕遇地震),模型结构出现中等破坏,该原型结构可以满足抗震设计的要求;TMD装置具有较好的减震效果。

In order to investigate the seismic performance and damage characteristics of reinforced concrete mega-frame structure, a shaking table test model with a geometric ratio of 1：25 scale was designed and fabricated. A rooftop tuned mass damper （TMD） was designed and the mega-frame structure with and without the TMD was tested on the shaking table. The deformation and acceleration responses were measured. The dynamic behavior and the damping effect with and without TMD were compared. The shaking table test results indicate that the test model suffers little damage under the design level earthquake action （peak ground acceleration of 0. 400g ）. It can also meet the collapse prevention requirements for severe earthquake （peak ground acceleration of 0. 880g ）. Therefore, the prototype structure is able to satisfy vibration the seismic performance demand of 7-degree seismic design intensity. The TMD provides a significant reduction effect.