摘要
在时变温度下,利用结构模态参数对桥梁结构状态诊断进行试验研究。通过对某拱桥模型进行长期动力测试,并对测试加速度信息进行模态参数识别,得到该模型在不同温度下前4阶的频率、阻尼比和振型。利用测试数据对该拱桥模型进行有限元模型修正,将结构的测试动力特性与有限元计算结果进行比较,分析该结构动力特性随温度的变化规律,建立环境温度与结构频率的关系模型,并利用该模型对测试模型的结构性能进行诊断。本文所提出的结构状态诊断方法能有效判别时变温度下该拱桥模型结构是否产生损伤,也为实际桥梁结构状态诊断提供了一种有效思路。
At time varying temperatures this paper carries out a test research on diagnosis for structural states of bridges by means of structural modal parameters.Upon long-term dynamic test for the model of some arch bridge and recognition for modal parameters of acceleration information in the test,frequency,damping ratio and modes of vibration in first 4 orders of the model at different temperatures are obtained.The paper modifies the model by finite element model via test data,analyzes change rules of the structural dynamic characteristics with temperatures by comparing them with calculated results by finite element,establishes a relationship model between ambient temperature and structural frequency,and diagnoses the structural properties of the model under test via the model of the arch bridge.The diagnosis methods for structural states proposed in the paper effectively identify whether the structures of the model at time varying temperatures are damaged or not,and also provide an effective idea for diagnosis for structural states of practical bridges.
出处
《公路交通技术》
2010年第5期66-71,共6页
Technology of Highway and Transport
关键词
模态参数
桥梁结构
时变温度
结构动力特性
modal parameter
bridge structure
time varyingtemperatures
structural dynamic characteristics
