大跨度桥梁PK箱梁断面颤振性能研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (9) : 25-31.

论文

大跨度桥梁PK箱梁断面颤振性能研究

方根深杨詠昕葛耀君

作者信息 +

Flutter performance of PK section girders for long-span bridges

FANG Genshen YANG Yongxin GE Yaojun ZHOU Zhiyong

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摘要

以某主跨820mPK箱梁斜拉桥为背景，借助节段模型风洞试验并结合二维三自由度颤振分析理论方法(2D-3DOF method)，进行了大跨度桥梁PK箱梁断面成桥状态颤振性能研究，提出了“软颤振”临界风速扭转响应根方差、峰值因子和阻尼比综合判定标准，并对三种尺寸抑流板颤振控制效果与驱动机理进行探索。研究表明，PK箱梁断面成桥状态具有明显的“软颤振”特点，而且风攻角效应明显，特别是0°和+3°颤振临界风速差异显著，主要是由于0°攻角表现为“弯扭耦合颤振”，+3°攻角为“单自由度扭转颤振”，两者气动阻尼变化规律差异明显而表现出不同的颤振特点；抑流板能有效提高PK箱梁断面+3°攻角的颤振临界风速，其增加了颤振耦合程度，虽然会激起更多的不利耦合气动阻尼，但是扭转运动自身产生的气动阻尼对系统的稳定作用也增强，气动阻尼之间的竞争将决定系统最终的发散。

Abstract

Flutter performance of PK section girders for long-span bridges in the finished bridge state was investigated based on a cable-stayed bridge with the main span of 820 meters by means of sectional models’ wind tunnel tests and the 2D-3DOF method. A comprehensive criterion with root mean square (RMS) deviation, peak factor and damping ratio of torsional responses of girders under critical wind speed to determine the critical point of “soft flutter”was proposed. The flutter control effect and flutter drive mechanism for 3 sizes of airflow-suppressing lamina were explored. The study showed that PK section girders in the finished bridge state have obvious “soft flutter” characteristics, the effects of wind attack angle are also obvious, especially, the flutter critical wind speeds under the wind attack angle of 0° and 3° have a remarkable difference, girders reveal bending-torsion coupled flutter under the wind attack angle of 0, while they reveal single–DOF torsion flutter under the wind attack angle of 3 due to their obviously different aerodynamic damping variation laws; airflow-suppressing lamina can effectively improve the flutter critical wind speed of PK section girders under the wind attack angle of 3° to increase flutter coupling level; although more aerodynamic damping going against coupling are excited with airflow-suppressing laminas installed, the aerodynamic damping generated by torsional motion can enhance the system’s stability; the competition among different types of aerodynamic damping determines if the system diverges.

关键词

PK箱梁断面

/ 软颤振 / 抑流板 / 气动阻尼 / 颤振形态

Key words

PK section girder / soft flutter / airflow-suppressing lamina / aerodynamic damping / flutter form

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方根深杨詠昕葛耀君. 大跨度桥梁PK箱梁断面颤振性能研究[J]. 振动与冲击, 2018, 37(9): 25-31

FANG Genshen YANG Yongxin GE Yaojun ZHOU Zhiyong . Flutter performance of PK section girders for long-span bridges[J]. Journal of Vibration and Shock, 2018, 37(9): 25-31

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