Determination Method of Bridge Rotation Angle Response Using MEMS IMU.
Determination Method of Bridge Rotation Angle Response Using MEMS IMU.
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DOI：
10.3390/s16111882
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发表时间：
2016-11-09
期刊：
影响因子：
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通讯作者：
Miki C
中科院分区：
文献类型：
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作者：
Sekiya H;Kinomoto T;Miki C
为了实施钢桥的维修，特别是与疲劳损伤有关的维修，监测桥梁在交通条件下的变形是非常重要的。由于桥梁结构的长度和柔性不同，在交通荷载作用下，桥梁的变形和旋转也不同。这种监测能够查明造成疲劳破坏的应力集中的原因，并提出适当的对策。然而，虽然桥梁变形监测需要观测桥梁的角响应和位移响应，但测量桥梁在交通荷载作用下的转角响应是困难的。理论上，转角响应可以通过角速度积分来计算，但在实际运营桥梁的现场测量中，由于交通引起的振动，难以估计必要的边界条件。为了解决这一问题，本文提出了一种由惯性测量单元（IMU）测量的角速度来确定在役桥梁旋转角响应的方法。为了验证我们提出的方法，使用九个微机电系统（MEMS） imu和两个接触式位移计进行了现场测量。结果表明，与接触式位移计计算的参考响应相比，该方法具有较高的精度。
To implement steel bridge maintenance, especially that related to fatigue damage, it is important to monitor bridge deformations under traffic conditions. Bridges deform and rotate differently under traffic load conditions because their structures differ in terms of length and flexibility. Such monitoring enables the identification of the cause of stress concentrations that cause fatigue damage and the proposal of appropriate countermeasures. However, although bridge deformation monitoring requires observations of bridge angle response as well as the bridge displacement response, measuring the rotation angle response of a bridge subject to traffic loads is difficult. Theoretically, the rotation angle response can be calculated by integrating the angular velocity, but for field measurements of actual in-service bridges, estimating the necessary boundary conditions would be difficult due to traffic-induced vibration. To solve the problem, this paper proposes a method for determining the rotation angle response of an in-service bridge from its angular velocity, as measured by a inertial measurement unit (IMU). To verify our proposed method, field measurements were conducted using nine micro-electrical mechanical systems (MEMS) IMUs and two contact displacement gauges. The results showed that our proposed method provided high accuracy when compared to the reference responses calculated by the contact displacement gauges.