摘要
横梁对Π型截面斜拉桥桥面静风三分力系数可能产生影响,并进而影响其风致抖振和拉索疲劳分析结果。以某П型截面独塔斜拉桥为例,提出了一种分段二维模拟方法来考虑横梁的影响,基于计算流体动力学模拟,分别采用分段二维模拟方法和三维模拟方法得出桥面三分力系数,通过有限元分析对比了上述两种模拟方法和不考虑横梁影响时斜拉桥抖振效应、拉索疲劳损伤及对应误差率等指标,还探讨了横梁间距、风速、风攻角及地面粗糙度对上述指标的影响,分析了分段二维模拟方法的适用性。结果表明:忽略横梁影响将导致Π型截面斜拉桥桥面抖振和拉索疲劳分析出现较大误差;提出的分段二维模拟方法不适用于拉索疲劳分析,但其抖振分析精度随着横梁间距的增大、地面粗糙度的增大、风速的降低和风攻角绝对值的降低而提高,能较好地适用于基本风速较小区域城市斜拉桥的抖振计算;Π型截面斜拉桥桥面抖振横向位移和拉索疲劳损伤均随着风速、风攻角绝对值和地面粗糙度的增大而增大,但抖振横向位移和拉索疲劳损伤分别随着横梁间距的增大而增大和减小。
The crossbeams may affect the three static wind force coefficients of a cable-stayed bridge with aП-shaped main beam section,and further affect the wind-induced buffeting and fatigue analysis results of cables.In this paper,a certain single-tower cable-stayed bridge with aП-shaped main beam section was taken as an example and a segmentation-based 2D simulation method for the consideration of main beams was proposed.Based on computational fluid dynamics simulation,the three static wind force coefficients of the bridge deck were obtained by segmentation-based 2D simulation method and 3D simulation method.The indexes such as bridge deck buffeting effect,cable fatigue damage and corresponding error rates of the above two simulation methods and the method without the consideration of the crossbeam effect were compared by finite element analysis.The effect of crossbeam spacing,wind speed,wind attack angle and terrain roughness on the above indexes were discussed and the feasibility of the segmentation-based 2D simulation method was analyzed.The results show that the ignorance of the crossbeam effect will lead to large error in bridge deck buffeting and cable fatigue analysis results of the cable-stayed bridge withП-shaped section;The proposed segmentation-based 2D simulation method is not suitable for cable fatigue analysis,but its buffeting analysis accuracy increases with the increase of beam spacing,the increase of terrain roughness,the decrease of the wind speed and the decrease of the absolute value of the wind attack angle,and can be well applied to the buffeting analysis of urban cable-stayed bridges in areas with a small reference wind speed.The bridge deck buffeting lateral displacement and the cable fatigue damage of the cable-stayed bridge increase with the increase of the wind speed,the absolute value of the wind attack angle and the terrain roughness.As the beam spacing increases,the buffeting lateral displacement increases while the cable fatigue damage decreases.
作者
方钊
杨凡
李爱群
曹宝雅
FANG Zhao;YANG Fan;LI Aiqun;CAO Baoya(School of Civil Engineering and Architecture,Nanjing Institute of Technology,Nanjing 211167,China;School of Civil Engineering,Southeast University,Nanjing 210096,China;School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)
出处
《振动与冲击》
2025年第8期259-266,314,共9页
Journal of Vibration and Shock
基金
国家自然科学基金青年基金项目资助(52008202,52108108)。
关键词
Π型截面主梁
横梁
三分力系数
抖振
拉索疲劳
П-shaped main beam section
crossbeam
wind force coefficient
buffeting
fatigue of cables
作者简介
第一作者:方钊,男,博士,副教授,1989年生;通信作者:李爱群,男,博士,教授,1962年生,E-mail:liaiqun@bucea.edu.cn。
