Refined Time-Domain Buffeting Analysis of a Long-Span Suspension Bridge in Mountainous Urban Terrain
Refined Time-Domain Buffeting Analysis of a Long-Span Suspension Bridge in Mountainous Urban Terrain
复制标题
山区城市地形大跨度悬索桥的精细时域抖振分析
DOI：
10.1155/2020/4703169
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发表时间：
2020-06
影响因子：
1.8
通讯作者：
Ni Zhi-Jun
中科院分区：
文献类型：
--
作者：
Wu Bo;Zhang Liang-Liang;Yang Yang;Liu Lian-Jie;Ni Zhi-Jun
采用现场实测、风洞试验和数值计算等方法，对某大跨度悬索桥进行了精细时域抖振分析。山区城市地形的风特征是通过长期的野外测量得到的。在风洞中对气动静力系数和气动导纳函数进行了实验测试。采用谱表示法模拟了桥梁上的脉动风场。最后在ANSYS中进行了抖振响应计算。评估了AAF、湍流功率谱和攻角（AoA）对抖振响应的影响，突出了经验简化造成的不准确性。为了在不增加预算的情况下提高抖振性能，对原始设计配置进行了微小的修改。增加护栏的通风量可以略微降低抖振响应，同时向内移动检查栏杆的控制效果更好。此外，考虑梁表面粗糙度时，抖振响应增大。利用计算流体力学（CFD）方法分析了抗扰措施的影响机理，主要在于梁周围湍流能量的耗散。研究结果可为类似桥梁的抗风分析和优化设计提供参考。
The field measurements, wind tunnel tests, and numerical calculations are utilized to conduct refined time-domain buffeting analysis of a long-span suspension bridge. The wind characteristics in the mountainous urban terrain are obtained through long-term field measurements. The aerostatic force coefficients (AFCs) and aerodynamic admittance functions (AAFs) are experimentally tested in a wind tunnel. The fluctuating wind fields on the bridge are simulated by the spectral representation method. Finally, the buffeting responses are calculated in ANSYS. The influences of AAF, turbulence power spectrum, and angle of attack (AoA) on the buffeting responses are evaluated, which highlight the inaccuracies caused by empirical simplifications. To improve the buffeting performance without a considerable extra budget, minor modifications are introduced to the original design configuration. The buffeting responses are slightly reduced by increasing the ventilation rate of guardrails, and the control efficiency is better when concurrently moving the inspection rails inward. Besides, the buffeting responses are increased when considering the roughness on the girder surface. The influence mechanism of the countermeasure is analyzed using the Computational Fluid Dynamics (CFD) method, which mainly lies in the dissipation of turbulence energy around the girder. The findings can contribute to the wind-resistant analysis and optimization design for similar bridges.
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影响因子：
4.7
作者：
Q. Ding;P.K.K. Lee;S. H. Lo
通讯作者：
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影响因子：
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