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Dissipated-Energy Distribution Characteristics of Steel Moment Frames Incorporated with Hysteretic Dampers

迟滞阻尼器钢框架的耗能分布特性

基本信息

批准号：
10450204
负责人：
NAKASHIMA Masayoshi
金额：
$ 1.34万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10450204/
关键词：
Steel Frame Hysteretic Damper Deformation Control Optimum Stiffness

项目摘要

This study is toward the establishment of seismic design of steel moment frames incorporated with hysteretic dampers. To this end, the following three subjects were examined : (1)modeling of hysteretic behavior of dampers made of low-yield steel; (2) dynamic test applied to frame subassemblies combined with hysteretic dampers; and (3)prediction of dissipated energy and maximum story drift of steel moment frames with those dampers.Major findings obtained from this study are summarized as follows : (1)A mathematical model in which conspicuous strain hardening characteristic of the hysteretic dampers made of low-yield steel is explicitly allowed for was developed. A systematic procedure to determine the associated variables included in this model was also proposed. (2)Dynamic loading test indicated that among various effects associated with loading rate the increase in the resistance (strength) is most notable. (3)Extensive numerical analyses lead the following observations. (a) The most notable parameter that controls the distribution of dissipated energy and maximum story drift along the stories is the strength of the main frame, and the distribution remains relatively uniform as long as the main frame behaves only elastically. (b)When the main frame responds beyond its elastic limit the story drift tends to be concentrated at the story that experiences the first yield excursion. (c)The observation in (b)suggests that the uniformity of the dissipated energy and story drift along the stories is impaired with the increase of ground motion amplitudes.

本研究旨在建立含滞回阻尼器的钢弯矩框架抗震设计方法。为此，研究了以下三个方面：(1)低产钢阻尼器的滞回特性建模；(2)对带有滞回阻尼器的车架组件进行动力试验；(3)采用这些阻尼器对钢框架的耗能和最大层间位移进行了预测。主要研究结果如下：(1)建立了明确考虑低屈服钢迟滞阻尼器显著应变硬化特性的数学模型。还提出了一个系统的程序来确定该模型中包含的相关变量。(2)动加载试验表明，在加载速率相关的各种效应中，阻力（强度）的增加最为显著。(3)广泛的数值分析得出以下结论。(a)控制耗散能分布和最大层间位移沿层的最显著参数是主框架的强度，并且只要主框架仅表现为弹性，分布就保持相对均匀。(b)当主框架的响应超过其弹性极限时，层间漂移倾向于集中在经历第一次屈服偏移的层间。(c) (b)的观测结果表明，随着地震动幅值的增加，耗散能量和楼层沿楼层漂移的均匀性受到破坏。