System Identification of Two Base-Isolated Bridges Using Seismic Records
System Identification of Two Base-Isolated Bridges Using Seismic Records
复制标题
利用地震记录对两座基础隔震桥进行系统识别
DOI：
10.1061/(asce)0733-9445(2000)126:10(1187
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
J. Yoshida
中科院分区：
文献类型：
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作者：
M. Chaudhary;M. Abé;Y. Fujino;J. Yoshida
从基础隔震桥梁上记录的地震加速度中识别系统参数，为检查这种桥梁系统的各种组件的性能提供了一个极好的机会。本研究提出一种两步系统辨识方法，用以从强震记录中辨识结构参数。第一步需要识别的非经典阻尼基础隔震桥梁桥墩桩基础系统的复模态参数的必要的理论公式推导。在第二步中，引入全局搜索方案来识别与所识别的模态参数相对应的系统的结构参数。将所提出的系统识别方法应用于两座基础隔震桥梁，成功地再现了1995年科比地震的一次主震和四次余震的墩帽和主梁响应，并识别了模态和结构参数。通过比较从实验数据确定的轴承的物理特性，与确定的值，并发现是令人满意的两座桥梁的基础隔离系统的性能进行评估。
Identification of system parameters from seismic accelerations recorded on a base-isolated bridge provides an excellent opportunity to examine the performance of various components of such bridge systems. This study proposes a two-step system identification method for identifying structural parameters from strong motion records. The first step entails identification of complex modal parameters of a nonclassically damped base-isolated bridge-pier-pile-foundation system for which necessary theoretical formulations are first derived. In the second step a global search scheme is introduced to identify the structural parameters of the system corresponding to the identified modal parameters. The proposed system identification method is applied to two base-isolated bridges such that recorded responses at pier cap and girder are successfully recreated for one main shock and four aftershocks of the 1995 Kobe earthquake and modal and structural parameters are identified. Performance of the base-isolation system is evaluated by comparing the physical properties of the bearings, determined from experimental data, with the identified values and is found to be satisfactory in both bridges.