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| Ground motion identification of bridge site based on acceleration response monitoring |
| CHEN Taicong, HONG Huihuang |
| State Key Laboratory of Subtropical Building Science, School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China |
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Abstract In health monitoring practice of bridge structures, using structural dynamic responses to identify bridge-site’s ground motion is very important for structural safety evaluation. Here, firstly, according to characteristics of bridge site, a non-stationary random process model was chosen to describe ground motion, and the corresponding variance function was derived. Then, a mathematical model was established for the ground motion identification problem. Based on the principle of maximum likelihood estimation, a progressive identification algorithm of real ground motion time history was deduced, in which the sensitivity of acceleration response corresponded to the discretized impulse response function. Taking a 3-span rigid frame bridge subjected to lateral earthquake as a numerical example, the identification effect of the proposed method was examined from two aspects of number of sensors and influence of observation noise. The results showed that the proposed identification method does not require a large number of sensors and has good anti-noise performance. Finally, shaking table tests of structural model was conducted to further verify the effectiveness of the proposed method.
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Received: 14 May 2019
Published: 15 April 2021
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［1］单德山, 黄珍, 李乔. 桥梁结构运营模态参数识别方法对比［J］. 桥梁建设, 2017, 47(5): 24-29.
SHAN Deshan, HUANG Zhen, LI Qiao. Comparison of operational modal parameter identification methods for bridge structures［J］. Bridge Construction, 2017, 47(5): 24-29.
［2］徐健, 周志祥, 唐亮, 等. 基于谱系聚类分析的桥梁结构模态参数自动化识别方法研究［J］. 振动与冲击, 2017, 36(11): 206-214.
XU Jian, ZHOU Zhixiang, TANG Liang， et al. Automatic identification of bridge structure modal parameters based on the improved EEMD and the pedigree clustering analysis method［J］. Journal of Vibration and Shock, 2017, 36(11): 206-214.
［3］ANNE T, JOHAN M, GUIDO D R. Damage assessment by FE model updating using damage functions［J］. Computer and Structures, 2002, 80(25): 1869-1879.
［4］HESTER D, GONZALEZ A. A wavelet-based damage detection algorithm based on bridge acceleration response to a vehicle ［J］. Mechanical Systems and Signal Processing, 2012, 28: 145-166.
［5］朱嘉健, 王立新, 姜慧, 等. 珠江黄埔大桥模态频率连续监测中的温度影响I: 频率识别［J］. 震灾防御技术, 2016, 11(1): 67-75.
ZHU Jiajian, WANG Lixin, JIANG Hui, et al. Temperature influence in modal frequency continuous monitoring of the Zhujiang Huangpu suspension bridge I: frequency identification［J］. Technology for Earthquake Disaster Prevention, 2016, 11(1): 67-75.
［6］林国良, 赵昆, 王玉石, 等. 龙江特大桥场地强地震动观测系统简介［C］//第五届全国桥梁结构健康与安全技术大会. 福州: 第五届全国桥梁结构健康与安全技术大会论文集, 2019.
［7］陈伟欢, 吕中荣, 陈树辉, 等. 广州新塔不同激励下动力特性监测［J］. 振动与冲击, 2012, 31(3): 49-54.
CHEN Weihuan, L Zhongrong, CHEN Shuhui, et al. Monitoring dynamic characteristics of Canton Tower under different excitations［J］. Journal of Vibration and Shock, 2012, 31(3): 49-54.
［8］杨智春, 贾有. 动载荷的识别方法［J］. 力学进展, 2015, 45: 29-54.
YANG Zhichun, JIA You. The identification of dynamic loads［J］. Advances in Mechanics, 2015, 45: 29-54.
［9］TAJIMI H. A statistical method of determining the maximum response of a building structure during an earthquake［C］//2nd World Conference on Earthquake Engineering. Tokyo: WCEE, 1960.
［10］CLOUGH R W, PENZIEN J. Dynamics of structures［M］. New York: McGraw-Hill, 1975.
［11］胡隶贤. 地震工程学［M］. 北京: 地震出版社, 1988.
［12］欧进萍, 牛荻涛, 杜修力. 设计用随机地震动的模型及其参数确定［J］. 地震工程与工程振动, 1991, 11(3): 45-54.
OU Jinping, NIU Ditao, DU Xiuli. Random earthquake ground motion model and its parameter determination used in aseismic design［J］. Earthquake Engineering and Engineering Vibration, 1991, 11(3): 45-54.
［13］AMIN M, ANG A H S. Nonstationary stochastic model of earthquake motions［J］. ASCE Journal of Engineering Mechanics, 1968, 94: 559-583.
［14］陈太聪, 韩大建. 结构施工过程中节段参数的连续识别［J］. 工程力学, 2005, 22(1): 229-234.
CHEN Taicong, HAN Dajian. Sequential estimation of segmental parameters during structural construction process［J］. Engineering Mechanics, 2005, 22(1): 229-234.
［15］陈太聪, 韩大建. 大跨度斜拉桥施工过程中的主梁节段自重识别［J］. 土木工程学报, 2005, 38(2): 68-74.
CHEN Taicong, HAN Dajian. Identification of self-weights of segmental girders during the construction process of a long-span cable-stayed bridge［J］. Journal of Civil Engineering, 2005, 38(2): 68-74.
［16］苏成, 徐瑞. 非平稳激励下结构随机振动时域分析法［J］. 工程力学, 2010, 27(12): 77- 83.
SU Cheng, XU Rui. Rand vibration analysis of structures subjected to non-stationary excitations by time domain method［J］. Engineering Mechanics, 2010, 27(12): 77-83.
［17］陈太聪, 苏成, 胡智强, 等. 非平稳随机响应灵敏度分析的时域显式法［J］. 振动工程学报, 2015, 28(4): 503-509.
CHEN Taicong, SU Cheng, HU Zhiqiang, et al. An explicit time-domain method in sensitivity analysis of non-stationary random responses［J］. Journal of Vibration Engineering, 2015, 28(4): 503-509.
［18］徐瑞. 大型复杂结构非平稳随机振动分析方法研究［D］. 广州： 华南理工大学, 2010.
［19］ Quanser Consulting Incorporation. User manual on active mass damper-two floors［M］. ［S.1.］: Quanser Consulting Incorporation, 2003.
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