New experimental system for base-isolated structures with various dampers and limit aspect ratio
New experimental system for base-isolated structures with various dampers and limit aspect ratio
复制标题
DOI：
10.12989/eas.2013.5.4.461
复制
发表时间：
2013-10
影响因子：
1.5
通讯作者：
I. Takewaki;M. Kanamori;S. Yoshitomia;M. Tsuji
中科院分区：
文献类型：
--
作者：
I. Takewaki;M. Kanamori;S. Yoshitomia;M. Tsuji
提出了一种新的基础隔震结构试验系统。基础隔震结构中常用的阻尼器有两种，一种是粘滞型阻尼器，另一种是弹塑性滞回型阻尼器。本文对设置粘滞阻尼器的基础隔震结构和设置弹塑性滞回阻尼器的基础隔震结构进行了比较。粘滞阻尼器采用微型活塞模型，弹塑性滞回阻尼器采用低屈服点钢模型。确定两个阻尼器的能力，使得在指定的变形下耗散的能量相等。当两种阻尼器的能力根据该准则确定时，它表明，与粘滞阻尼器相比，使用弹塑性滞回阻尼器的基础隔震结构的反应更大。这一特性是通过比较长宽比的界限来证明的。结果表明，设置弹塑性滞回阻尼器的基础隔震结构的高宽比限值一般小于设置粘滞阻尼器的基础隔震结构的高宽比限值。当基础隔震结构承受长时程输入时，弹塑性滞回阻尼器的力学性能变差，安装滞回阻尼器的基础隔震结构的反应比安装粘滞阻尼器的基础隔震结构的反应大。这种材料性能的变化对基础隔震结构的响应的影响也进行了研究。
A new experimental system of base-isolated structures is proposed. There are two kinds of dampers usually used in the base-isolated buildings, one is a viscous-type damper and the other is an elastic-plastic hysteretic-type damper. The base-isolated structure with a viscous damper and that with an elastic-plastic hysteretic damper are compared in this paper. The viscous damper is modeled by a mini piston and the elastic-plastic hysteretic damper is modeled by a low yield-point steel. The capacity of both dampers is determined so that the dissipated energies are equivalent at a specified deformation. When the capacity of both dampers is determined according to this criterion, it is shown that the response of the base-isolated structure with the elastic-plastic hysteretic damper is larger than that with the viscous damper. This characteristic is demonstrated through the comparison of the bound of the aspect ratio. It is shown that the bound of aspect ratio for the base-isolated structure with the elastic-plastic hysteretic damper is generally smaller than that with the viscous damper. When the base-isolated structure is subjected to long-duration input, the mechanical property of the elastic-plastic hysteretic damper deteriorates and the response of the base-isolated structure including that damper becomes larger than that with the viscous damper. The effect of this change of material properties on the response of the base-isolated structure is also investigated.