Chen Zeng-Shun, Zhang Cheng, Wang Xu, Ma Cun-Ming
State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China.
Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China.
Sensors (Basel). 2017 Feb 9;17(2):335. doi: 10.3390/s17020335.
Bridges are an important component of transportation. Flutter is a self-excited, large amplitude vibration, which may lead to collapse of bridges. It must be understood and avoided. This paper takes the Jianghai Channel Bridge, which is a significant part of the Hong Kong-Zhuhai-Macao Bridge, as an example to investigate the flutter of the bridge deck. Firstly, aerodynamic force models for flutter of bridges were introduced. Then, wind tunnel tests of the bridge deck during the construction and the operation stages, under different wind attack angles and wind velocities, were carried out using a high frequency base balance (HFBB) system and laser displacement sensors. From the tests, the static aerodynamic forces and flutter derivatives of the bridge deck were observed. Correspondingly, the critical flutter wind speeds of the bridge deck were determined based on the derivatives, and they are compared with the directly measured flutter speeds. Results show that the observed derivatives are reasonable and applicable. Furthermore, the critical wind speeds in the operation stage is smaller than those in the construction stage. Besides, the flutter instabilities of the bridge in the construction and the operation stages are good. This study helps guarantee the design and the construction of the Jianghai Channel Bridge, and advances the understanding of flutter of long afterbody bridge decks.
桥梁是交通运输的重要组成部分。颤振是一种自激式大幅振动，可能导致桥梁坍塌。必须对其有所了解并加以避免。本文以作为香港珠海澳门大桥重要组成部分的江海通道桥为例，对桥面板的颤振进行研究。首先，介绍了桥梁颤振的气动力模型。然后，利用高频底座天平（HFBB）系统和激光位移传感器，对桥面板在施工阶段和运营阶段、不同攻角和风速下进行了风洞试验。通过试验，观测了桥面板的静态气动力和颤振导数。相应地，基于这些导数确定了桥面板的临界颤振风速，并与直接测量的颤振速度进行了比较。结果表明，观测到的导数是合理且适用的。此外，运营阶段的临界风速小于施工阶段的临界风速。此外，桥梁在施工阶段和运营阶段的颤振稳定性良好。本研究有助于保障江海通道桥的设计和施工，并增进对长后体桥面板颤振的认识。
