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Finite element modeling of a full-scale five-girder bridge for structural health monitoring

机译：用于结构健康监测的全尺寸五梁桥的有限元建模

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摘要

Finite element modeling is commonly used to simulate the effect of damage on in-service bridges to facilitate the study of vibration-based damage detection techniques. This study describes the field testing and finite element modeling of an in situ, full-scale, five-girder bridge that is subjected to controlled levels of known damage. The focus of the study is finite element (FE) model calibration to enable the study of damage scenarios including those not imposed during the field tests. Modal parameters are extracted from triaxial vibration records obtained over a relatively dense measurement grid using inexpensive geophones and are used to calibrate a three-dimensional FE model of the bridge. The calibration process and considerations that should be made during field tests for proper model calibration are discussed. Various vibration-based damage detection techniques are evaluated based on their ability to locate the simulated damage. Results show that most of the damage detection techniques evaluated are capable of successfully locating the induced damage on a global level. It is observed from the present study that the horizontal vibration response of the bridge is particularly sensitive to the simulated damage. It is recommended that efforts be made to measure a bridge's horizontal vibration response (in addition to vertical vibration records) during field tests and this information be included in the FE model calibration processes.
机译：有限元建模通常用于模拟在役桥梁上的损伤效果，以促进基于振动的损伤检测技术的研究。这项研究描述了现场，全尺寸，五梁桥的现场测试和有限元建模，该桥受到已知水平的已知破坏。研究的重点是有限元（FE）模型校准，以能够研究损坏场景，包括在现场测试中未施加的那些。模态参数是使用便宜的地震检波器从在相对密集的测量网格上获得的三轴振动记录中提取的，并用于校准桥梁的三维有限元模型。讨论了校准过程和在现场测试期间应进行的适当模型校准应考虑的因素。基于各种基于振动的损坏检测技术对模拟损坏的定位能力，可以对其进行评估。结果表明，所评估的大多数损害检测技术都能够在全球范围内成功定位诱发的损害。从本研究中可以看出，桥梁的水平振动响应对模拟损伤特别敏感。建议在现场测试期间努力测量桥梁的水平振动响应（除了垂直振动记录），并将此信息包括在FE模型校准过程中。

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