| 基于GPS的叠合梁斜拉桥双层模型修正方法 |
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| 引用本文： | 刘云,钱振东.基于GPS的叠合梁斜拉桥双层模型修正方法[J].东南大学学报,2008,24(1):80-84. |
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| 作者姓名： | 刘云 钱振东 |
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| 作者单位： | 东南大学交通学院 南京210096 |
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| 基金项目： | The Special Project of the Ministry of Construction of China (No.20060909). |
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| 摘 要： | 为了建立实测动响应和桥梁健康状况的实质性联系,提出用双层模型修正方法修正叠合梁斜拉桥理论计算模型.以实测固有频率为第1层修正目标,采用人工调节方法,在可靠范围内变化桥面板质量、网格划分密度、混凝土模量及边跨压重等参数修正模型的动力特性;然后以GPS实测动响应为第2层修正目标,通过逐步减小结构各向刚度EI模拟桥梁整体刚度损伤,采用有限元迭代的方法修正模型的挠度值.以南浦大桥为例,对其进行有限元建模,并利用所提出的方法进行模型修正.分析结果表明,经过第1层模型修正,频率误差的标准偏差小于7%,比初始误差有明显改善;经过第2层模型修正,桥梁跨中挠度误差小于10%,桥梁结构各向刚度EI下降约20%.研究结果表明理论计算结果与实测结果相吻合.
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| 关 键 词： | 叠合梁 动响应 双层模型修正 |
| 修稿时间： | 2007年6月6日 |
Double-layer model updating for steel-concrete composite beam cable-stayed bridge based on GPS |
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| Liu Yun,Qian Zhendong.Double-layer model updating for steel-concrete composite beam cable-stayed bridge based on GPS[J].Journal of Southeast University(English Edition),2008,24(1):80-84. |
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| Authors: | Liu Yun Qian Zhendong |
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| Abstract: | In order to establish the relationship between the measured dynamic response and the health status of long-span bridges,a double-layer model updating method for steel-concrete composite beam cable-stayed bridges is proposed.Measured frequencies are selected as the first-layer reference data,and the mass of the bridge deck, the grid density,the modulus of concrete and the ballast on the side span are modified by using a manual tuning technique. Measured global positioning system (GPS) data is selected as the second-layer reference data,and the degradation of the integral structure stiffness EI of the whole bridge is taken into account for the second-layer model updating by using the finite element iteration algorithm.The Nanpu Bridge in Shanghai is taken as a case to verify the applicability of the proposed model updating method.After the first-layer model updating,the standard deviation of modal frequencies is smaller than 7%.After the second-layer model updating,the error of the deflection of the mid-span is smaller than 10%.The integral structure stiffness of the whole bridge decreases about 20%.The research results show a good agreement between the calculated response and the measured response. |
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| Keywords: | GPS steel-concrete composite beam GPS dynamic response double-layer model updating |
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