摘要
阻尼比是桥梁结构重要的自振特性参数,其机理复杂,无法通过结构理论计算确定,只能采用实测方法获取真值。波形分析法是结构动力学中常用的一种实测阻尼比的方法,一般采用动位移信号衰减曲线求解阻尼比。受当前测试仪器及现场条件的限制,一些大跨径桥梁很难找到不动点获取实用可靠的动位移信号,公路桥梁相关规范及工程实践中一般采用加速度信号代替动位移信号求解公路桥梁阻尼比,而采用加速度信号求解公路桥梁阻尼比是否客观准确,值得探讨。通过对某公路桥梁多组实测动位移、加速度信号采用波形分析法分别求取阻尼比,探讨实测阻尼比量值的随机性及两种信号求解结果的一致性。据此,得出了对工程实践有益的结论与建议。
Damping ratio is an important characteristic parameter of the bridge structure. Its mechanism is complex and cannot be determined through the structure theory calculate. Its real value only can be obtained by the actual measurement. Waveform analysis is a method commonly used to measure damping ratio in structural dynamics. In general, the damping ratio used dynamic displacement attenuation curve to solve. Limited by current testing equipment and condition, some large span bridges are difficult to find the unmovable point to obtain the practical and reliable dynamic displacement signal. In the relevant regulations of highway bridges and in engineering practice, acceleration signals are used to replace the displacement signal to solve the damping ratio of highway bridges. It is worth discussing whether the acceleration signal is used to solve the highway bridge damping ratio. In this paper, the dynamic displacement signals and acceleration signals by waveform analysis method to solve damping ratios was studied. The randomness of damping ratio and the consistency of two signal solutions are discussed. According to the studying,some conclusion and suggestion for engineering practice were presented.
出处
《上海公路》
2018年第3期39-42,共4页
Shanghai Highways
关键词
桥梁与隧道工程
波形分析法
公路桥梁
阻尼比
跑车余振
bridge and tunnel engineering
waveform analysis method
highway bridge
damping ratio
the sports car residual vibration
