| 中央扣对悬索桥动力特性及短吊索车载激励响应的影响 |
| |
| 引用本文： | 李光玲,苏权科,高文博,韩万水,严超. 中央扣对悬索桥动力特性及短吊索车载激励响应的影响[J]. 中国公路学报, 2021, 34(4): 174-186. DOI: 10.19721/j.cnki.1001-7372.2021.04.015 |
| |
| 作者姓名： | 李光玲 苏权科 高文博 韩万水 严超 |
| |
| 作者单位： | 1. 长安大学公路学院, 陕西西安 710064;2. 港珠澳大桥管理局, 广东珠海 519015 |
| |
| 基金项目： | 国家重点研发计划项目（2019YFB1600702）；国家自然科学基金项目（51878058）；陕西省自然科学基础研究计划项目（2019JZ-02，2020JQ-665） |
| |
| 摘 要： | 为实现运营阶段中央扣对悬索桥动力特性及车载激励下短吊索响应影响的量化分析,进而为悬索桥设计及维养策略提供参考,基于已编制的车-桥耦合分析系统,引入制动惯性力及俯仰力矩模拟车辆制动力,建立了考虑车辆制动过程的车-桥耦合分析系统;以一座单跨地锚式悬索桥为工程背景,建立无、有中央扣2种缆梁连接体系的全桥空间有限元模型,研究中...
|
| 关 键 词： | 桥梁工程 悬索桥 车-桥耦合振动 中央扣 动力特性 缆梁相对位移 疲劳损伤度 |
| 收稿时间： | 2019-11-15 |
Influence of Rigid Central Clamps on Dynamic Characteristics of Suspension Bridge and Vehicle Excitation Responses of Short Suspenders |
| |
| LI Guang-ling,SU Quan-ke,GAO Wen-bo,HAN Wan-shui,YAN Chao. Influence of Rigid Central Clamps on Dynamic Characteristics of Suspension Bridge and Vehicle Excitation Responses of Short Suspenders[J]. China Journal of Highway and Transport, 2021, 34(4): 174-186. DOI: 10.19721/j.cnki.1001-7372.2021.04.015 |
| |
| Authors: | LI Guang-ling SU Quan-ke GAO Wen-bo HAN Wan-shui YAN Chao |
| |
| Affiliation: | 1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China;2. Hong Kong-Zhuhai-Macao Bridge Authority, Zhuhai 519015, Guangdong, China |
| |
| Abstract: | This study carried out a quantitative analysis of the influence of rigid central clamps (RCCs) on the dynamic characteristics of suspension bridge and responses of short suspenders under vehicle excitations during the operational stage, and further provides some references for the design and maintenance strategy of suspension bridge. Based on the developed vehicle-bridge coupling vibration analysis system, the braking inertia force and pitching moment were introduced to simulate the vehicle braking force. A vehicle-bridge coupling vibration analysis system that considers the vehicle braking process was established. A single-span earth-anchor suspension bridge was used as the engineering model to investigate the dynamic characteristics of the bridge and vehicle excitation responses of short suspenders, by simulating the corresponding finite element models with or without RCCs. The control effects of RCCs on the vehicle braking excitation responses of short suspenders were obtained through the established analysis system, considering different braking locations, initial braking speeds, and braking decelerations. Considering the bending stresses of short suspenders caused by cable-girder relative movement, an analysis process for the fatigue damage on the short suspenders under traffic excitation was established, and the effects of the RCCs on the equivalent fatigue stress amplitude and fatigue damage were studied. The analysis results show that the RCCs improves longitudinal and torsional stiffness of the suspension bridge, changes the cable-girder relative movement characteristics, and reduces the cycle numbers and amplitudes of the cable-girder relative movement, which has effectively controlled cable-girder relative displacement responses of shot suspenders under running vehicle excitations by over 60.3%. Considering the different values of braking locations, initial braking speeds, and braking decelerations, the effects of RCCs on reducing the percentages of cable-girder relative displacement amplitudes of short suspenders could be over 92.9%, 85.1%, and 85%, respectively, noting that the sensitivities of the braking excitation responses of short suspenders to these braking parameters are effectively reduced. Under random traffic flow, the axial stresses of short suspenders are less affected by rigid central clamps; nevertheless, the amplitude of bending stresses caused by cable-girder relative movement is greatly affected. The equivalent fatigue stress amplitude and fatigue damage of short suspenders are reduced significantly. In particular, the fatigue damage of the shortest suspender, which is closest to the mid-span, decreased by nearly 71.4%. Therefore, the RCCs could effectively control different vehicle excitation responses of short suspenders in a suspension bridge during the operational stage. |
| |
| Keywords: | bridge engineering suspension bridge vehicle-bridge coupling vibration rigid central clamps dynamic characteristics cable-girder relative movement fatigue damage |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《中国公路学报》浏览原始摘要信息 |
|
点击此处可从《中国公路学报》下载免费的PDF全文 |
|
