| 基于动力特性的简支U形梁的模态识别 |
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| 引用本文： | 周奎,缪润翰,郭耀,刘义.基于动力特性的简支U形梁的模态识别[J].上海理工大学学报,2016,38(2):192-197. |
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| 作者姓名： | 周奎 缪润翰 郭耀 刘义 |
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| 作者单位： | 上海理工大学 环境与建筑学院, 上海 200093;上海理工大学 环境与建筑学院, 上海 200093;上海理工大学 环境与建筑学院, 上海 200093;上海理工大学 环境与建筑学院, 上海 200093 |
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| 摘 要： | 基于自然激励技术(NExT)和ITD法的基本理论,采用环境激励的动力测试方法和基于S变换的滤波技术,对实验室3根1∶10缩尺比例的预应力混凝土U形梁进行了动力测试试验.通过提取分析模态参数,从模态识别的角度分析了采样频率、主梁腹板翼缘损伤、外荷载的激励对U形梁动力特性的影响.
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| 关 键 词： | U形梁 环境激励 S变换 模态识别 |
| 收稿时间： | 2015/6/23 0:00:00 |
Modal Identification of Simply Supported U-Shaped Beam Based on Dynamic Characteristics Tests |
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| ZHOU Kui,MIAO Runhan,GUO Yao and LIU Yi.Modal Identification of Simply Supported U-Shaped Beam Based on Dynamic Characteristics Tests[J].Journal of University of Shanghai For Science and Technology,2016,38(2):192-197. |
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| Authors: | ZHOU Kui MIAO Runhan GUO Yao and LIU Yi |
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| Institution: | School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China;School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China;School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China;School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China |
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| Abstract: | Dynamic tests on three pre-stressed reinforced concrete U-shaped beams,with the scale of 1:10,were carried out by using ambient excitation technique and filtering technique based on S-transform,by virtue of the basic theory of natural excitation technique (NExT) and ibrahim time domain technique (ITD).The modal parameters extracted from the tests results were used to analyze the influences of different sampling frequencies,flange damage of main girder web and different load excitation on the dynamic characteristics of U-shaped beams. |
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| Keywords: | U-shaped beam ambient excitation S-transform modal identification |
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