牛栏江大桥模态测试及数值模拟
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摘要
模态是结构的固有特性,结构模态参数由结构刚度、质量分布等因素决定,是决定结构动力特性和衡量数值分析结果可靠性的重要参数。本文通过合理选择传感器和数据采集器,克服了信号弱的困难,经现场测试得到牛栏江大桥竖向、顺桥向和横桥向的固有频率,并通过对比分析有限元模拟结果和现场实测结果,证明引桥质量对主跨模态参数影响很小,为实验室中进行主跨刚构部分的地震反应分析和伪动力试验提供了重要基础。
Modal property is the characteristic of the structure.Structural modal parameters are determined by many factors including structural rigidity,mass distribution.Modal characteristic is an important factor influencing the dynamic properties of the structures and reliability of analysis results.By choosing suitable sensors and data acquisition,the natural frequencies in the vertical,longitudinal,and horizontal direction of Niulan jiang Bridge were obtained by field tests and compared with simulation results.It is found that the approach bridge quality has little influence on model parameters of the main bridge which provides an important basis for seismic response analysis and pseudo dynamic experiment of the main bridge.
Modal property is the characteristic of the structure.Structural modal parameters are determined by many factors including structural rigidity,mass distribution.Modal characteristic is an important factor influencing the dynamic properties of the structures and reliability of analysis results.By choosing suitable sensors and data acquisition,the natural frequencies in the vertical,longitudinal,and horizontal direction of Niulan jiang Bridge were obtained by field tests and compared with simulation results.It is found that the approach bridge quality has little influence on model parameters of the main bridge which provides an important basis for seismic response analysis and pseudo dynamic experiment of the main bridge.
引文
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