Influence of movable bearings performance on the dynamic characteristics of a cable-stayed bridge : insights from seismic monitoring records
Influence of movable bearings performance on the dynamic characteristics of a cable-stayed bridge : insights from seismic monitoring records
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活动支座性能对斜拉桥动力特性的影响：地震监测记录的见解
DOI：
10.1007/s10518-021-01282-y
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发表时间：
2021
影响因子：
4.6
通讯作者：
Yozo Fujino
中科院分区：
文献类型：
--
作者：
Dionysius M Siringoringo;Yozo Fujino
本文利用地震监测系统的振动记录，对一座活动支座斜拉桥的地震反应特性和模态参数进行了研究。本文以十胜斜拉桥为研究对象，介绍了一种设置可移动球形摩擦板的单平面预应力斜拉桥。桥梁地震反应受到各种级别的地震，包括2003年十胜大地震是从一个永久性的地震监测系统。采用时不变和时变递推子空间辨识方法对桥梁的频率和阻尼等动力特性进行了辨识。识别结果表明，在最大地震作用下，低阶振型的阻尼比可以达到临界阻尼的10%以上，高于抗震设计规范中通常假定的阻尼比。由摩擦力引起的附加阻尼在可移动SFP轴承被确定为大阻尼的主要来源，它是量化的基于模态的逆分析，使用稀疏正则化方法。分析结果证实了SFP可动支座的库仑摩擦型粘滑特性对桥梁动力特性的影响。轴承在较小的激励下保持卡住，导致结构刚度较高，在较大的激励下滑动，导致刚度降低。滑动过程在SFP轴承的接触表面之间引起摩擦力，这导致阻尼随着激励水平的增加而增加。然而，阻尼不是连续增加的，而是在一定水平的激励之后变得更大。
An investigation on seismic response characteristics and modal parameters of a cable-stayed bridge with movable bearings using vibration records obtained from a seismic monitoring system is presented in this paper. The object of this study is the Tokachi cable-stayed bridge, a single plane prestressed cable-stayed bridge that is equipped with moveable spherical frictional plate (SFP). The bridge seismic responses subjected to various levels of earthquake including the 2003 Tokachi Great earthquake were obtained from a permanent seismic monitoring system. The bridge dynamic characteristics that include frequency and damping were estimated by both the time-invariant and time-variant recursive subspace identification methods. The identification results reveal that damping ratios of the low order modes estimated during the largest earthquake can reach more than 10% of the critical damping, which is higher than what usually assumed in the seismic design code. Supplementary damping caused by friction force at the movable SFP bearings was identified as the main source of the large damping, and it was quantified by a modal-based inverse analysis using the sparse regularization method. Results of the analyses confirm the influence of moveable SFP bearings performance with its Coulomb-friction type stick–slip behavior on the dynamic characteristics of the bridge. The bearings remain stuck at smaller excitation causing higher stiffness of the structure and slip during a larger excitation resulting in stiffness reduction. The sliding process induces friction force between contacting surfaces of the SFP bearings which results in the increase of damping as the excitation level increases. The damping, however, does not increase continuously, but becomes steadier after a certain level of excitation.
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影响因子：
5.4
作者：
D. Siringoringo;Y. Fujino
通讯作者：
D. Siringoringo;Y. Fujino
基于非均匀Timoshenko梁模型的波法建筑物结构体系辨识
DOI：
10.1061/(asce)em.1943-7889.0000933
发表时间：
2015
期刊：
Journal of Engineering Mechanics-asce
影响因子：
--
作者：
M. Ebrahimian;M. Todorovska
通讯作者：
M. Todorovska
影响因子：
2.6
作者：
Juang, JN
通讯作者：
Juang, JN
影响因子：
4.5
作者：
D. Siringoringo;Y. Fujino
通讯作者：
D. Siringoringo;Y. Fujino
影响因子：
4.5
作者：
D. Siringoringo;Y. Fujino
通讯作者：
D. Siringoringo;Y. Fujino