含减振子结构的巨型框架结构模型振动台试验研究

在含减振子结构的巨型框架结构(MFVCS)中,通过在部分主、次框架的连接处,即次框架柱底部和主框架梁之间设置隔震支座,从而形成减振子结构.为研究MFVCS的减震效果,设计并制作了一个几何缩尺比为1/25的模型,通过更换最顶部的子结构柱底的支座类型,形成非减振和单减振巨型框架两个结构.通过振动台试验,得到了两结构的动力特...

Shaking table test of a mega-frame with vibration control substructure

In the mega-frame with vibration control substructure (MFVCS), the vibration control substructure is constructed by using lead-rubber bearings to connect the bottom of common substructure with the beams of mega-frame. To study the damping effect of MFVCS, a model with a geometrical scale of 1/25 was designed and fabricated by changing the type of the bearings under the column of the top substructure, two different structures (a traditional mega-frame and a MFVCS structure) could be generated. Through shaking table tests, the dynamic characteristics, acceleration and displacement responses of the two structures were compared, and the damping effect under different earthquake records was analyzed. The results show that only minor damage occurrs in the main structure during the test. The mean values of the acceleration and peak displacement damping coefficients under different earthquake records are 15.1% and 12.3%, respectively. And the mean values of the acceleration and displacement mean square root damping coefficients are both 22.2%. The seismic responses of the MFVCS are reduced comparing with those of the traditional mega-frame structure.