| 辛大波,欧进萍.基于流场定常化的桥梁颤振分析简化数值方法[J].计算力学学报,2009,26(2):162~166 |
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| 基于流场定常化的桥梁颤振分析简化数值方法 |
| Simplified numerical method for flutter analysis of bridge based on steady-simplified wind field from unsteady flow |
| 投稿时间：2007-03-03 |
| DOI：10.7511/jslx20092003 |
| 中文关键词: 颤振 颤振临界风速 数值模拟 大跨桥梁 |
| 英文关键词:flutter critical wind speed numerical simulation long-span bridge |
| 基金项目:国家自然科学基金 (50278029) 资助项目. |
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| 中文摘要: |
| 基于数值方法实现快速有效地分析评价大跨桥梁颤振稳定性。针对强迫振动法识别颤振导数试验中的大跨桥梁二维节段模型,利用RNG k-ε湍流模型并采用有限体积法求解桥梁模型绕流二维不可压缩流体Navier-Stokes方程,通过计算桥梁断面模型在周期运动中少数离散时刻的气动力,利用最小二乘法计算颤振导数,采用SCANLAN方法求解颤振临界风速,最终进行颤振稳定性分析。通过该方法计算出了丹麦Great Belt East桥和我国虎门大桥的颤振临界风速。计算结果与已有试验结果十分接近,进而验证了该数值方法的有效性和可靠性。 |
| 英文摘要: |
| The efficient and quick evaluation for flutter stability of long-span bridges is studied via numerical method. Based on the Force Vibration Technique to identify flutter derivatives, the wind flow field around two dimensional bridge sections in wind tunnel experiment can be simulated by solving two dimensional viscous incompressible Navier-Stokes equations and RNG k-εturbulent equations. The finite volume method is used for dispersing the equations. The aerodynamic forces of bridge sections at a few discrete time instant points of one periodic movement are calculated with the wind flow field and the flutter derivatives can be got with the Least-square method. The flutter stability is estimated by flutter critical wind speed worked out by the Scanlan method. The two flutter critical wind speed results of the Great Belt East Bridge in Denmark and the Humen bridge in China are computed with the present numerical method. The present numerical results are very close to the experimental ones so the present simplified numerical method is validated. |
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