悬索桥概念设计颤振稳定性分析研究
发布时间：2018-11-07 15:32
【摘要】：随着计算机技术的快速发展，近年来建立在计算流体动力学基础上的数值风洞技术在水利、机械、环境、土木工程等领域得到广泛应用。数值风洞技术不受试验条件制约，具有很好的可重复性，能模拟复杂几何外形问题且流场可视性好，已成为一种非常重要的抗风研究手段。尤其在桥梁方案概念设计阶段为工程前期设计提供了有效的技术手段，，发展前景十分广阔。本文采用数值风洞技术进行了伶仃悬索桥设计方案的颤振性能以及气动控制措施的分析研究，为该悬索桥的概念设计提供了相关设计建议。 本文基于Scanlan颤振导数理论数值分析主梁断面颤振性能。采用数值方法，利用动网格技术实现了模型分状态强迫振动试验。选用Realizablek ξ湍流模型，PISO算法迭代，提取气动力数据识别颤振导数。运用上述方法识别了理想平板颤振导数，并与Theodorsen平板理论解比较，验证本文方法的正确性与有效性，表明本文方法可应用于大跨悬索桥主梁断面颤振导数识别。 采用上述方法，在-5°~+5°风攻角下，对伶仃悬索桥施工状态（不带栏杆与检修道）和成桥状态（带栏杆与检修道）下的主梁断面分别进行了二维绕流场计算，识别了颤振导数，并计算了四种悬索桥概念设计方案在各风攻角下的颤振临界风速。成桥状态下颤振导数与虎门二桥相同箱梁断面的节段模型风洞试验值吻合较好，栏杆与检修道的引入降低了桥梁颤振临界风速，随着风攻角绝对值的增大，主梁断面气动外形逐渐变差，各悬索桥方案颤振临界风速都呈下降趋势，且+5°风攻角下颤振临界风速最低，颤振稳定性最差。 基于颤振稳定性要求，进行了气动控制措施优化试验，采取中央开槽、中央开槽加竖向稳定板、中央开槽加槽内斜稳定板、中央开槽加竖向边稳定板形成带气动控制措施的新断面模型并在最不利风攻角下进行了颤振分析，评估气动控制措施效果，发现中央开槽措施明显提高了断面颤振性能，且稳定板的位置对断面颤振性能影响不同，中央稳定板与槽内斜稳定板可以有效提高断面颤振临界风速，竖向边稳定板反而降低了断面颤振临界风速。本文优先推荐中央开槽与中央稳定板组合的措施作为最终的颤振改良气动措施。
[Abstract]:With the rapid development of computer technology, numerical wind tunnel technology based on computational fluid dynamics (CFD) has been widely used in the fields of water conservancy, machinery, environment, civil engineering and so on. Numerical wind tunnel technology is not restricted by test conditions, has good repeatability, can simulate complex geometric shape problems and has good visibility of flow field, so it has become a very important method of wind resistance research. Especially in the stage of conceptual design of bridge scheme, it provides an effective technical means for the early stage of engineering design, and has a very broad development prospect. In this paper, the flutter performance and aerodynamic control measures of Lingding suspension bridge are analyzed by using numerical wind tunnel technique, which provides relevant design suggestions for the conceptual design of the suspension bridge. Based on the Scanlan flutter derivative theory, the flutter performance of the main beam section is numerically analyzed in this paper. The dynamic grid technique is used to realize the forced vibration test of the model by using the numerical method. The Realizablek 尉 turbulence model is selected and the PISO algorithm is used to iterate to extract aerodynamic data to identify flutter derivatives. The above method is used to identify the flutter derivative of ideal plate, and compared with the theoretical solution of Theodorsen plate, the validity and validity of the method are verified. It is shown that the method in this paper can be applied to the identification of flutter derivatives of the main girder section of long-span suspension bridge. Using the above method, under the wind attack angle of -5 掳~ 5 掳, the 2-D flow field of the main beam section under the construction state (without railing and overhaul track) and the completed state (with railing and overhaul track) of Lingding suspension bridge are calculated, respectively, and the flutter derivatives are identified. The flutter critical wind speed of four conceptual design schemes of suspension bridge at different angles of attack is calculated. The flutter derivative of the bridge agrees well with the wind tunnel test data of the same section of the box girder of Humen second Bridge. The introduction of railing and overhaul track reduces the critical flutter velocity of the bridge, and with the increase of the absolute value of the wind attack angle, the flutter critical wind speed of the bridge is reduced with the increase of the wind attack angle. The aerodynamic profile of the main beam section gradually becomes worse, the critical flutter velocity of each suspension bridge is decreasing, and the critical flutter velocity is the lowest and the flutter stability is the worst at the 5 掳wind attack angle. Based on the requirements of flutter stability, the optimization test of pneumatic control measures is carried out. The central slotted plate, the central slotted plate plus vertical stabilizing plate, the central slotted plate and the inner slot-stabilized plate are adopted. A new section model with pneumatic control measures is formed by central slot and vertical side stabilizing plate. Flutter analysis is carried out under the most unfavorable wind attack angle. The results of aerodynamic control measures are evaluated. It is found that the central slot method can obviously improve the flutter performance of the section. The influence of the position of the stabilizer plate on the flutter performance of the section is different. The central stable plate and the inclined plate in the slot can effectively increase the critical flutter velocity of the section, while the vertical side stabilizing plate decreases the critical flutter velocity of the section. The combination of central slotted plate and central stabilizer plate is recommended as the final flutter improvement aerodynamic method in this paper.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.25;U441.3
[Abstract]:With the rapid development of computer technology, numerical wind tunnel technology based on computational fluid dynamics (CFD) has been widely used in the fields of water conservancy, machinery, environment, civil engineering and so on. Numerical wind tunnel technology is not restricted by test conditions, has good repeatability, can simulate complex geometric shape problems and has good visibility of flow field, so it has become a very important method of wind resistance research. Especially in the stage of conceptual design of bridge scheme, it provides an effective technical means for the early stage of engineering design, and has a very broad development prospect. In this paper, the flutter performance and aerodynamic control measures of Lingding suspension bridge are analyzed by using numerical wind tunnel technique, which provides relevant design suggestions for the conceptual design of the suspension bridge. Based on the Scanlan flutter derivative theory, the flutter performance of the main beam section is numerically analyzed in this paper. The dynamic grid technique is used to realize the forced vibration test of the model by using the numerical method. The Realizablek 尉 turbulence model is selected and the PISO algorithm is used to iterate to extract aerodynamic data to identify flutter derivatives. The above method is used to identify the flutter derivative of ideal plate, and compared with the theoretical solution of Theodorsen plate, the validity and validity of the method are verified. It is shown that the method in this paper can be applied to the identification of flutter derivatives of the main girder section of long-span suspension bridge. Using the above method, under the wind attack angle of -5 掳~ 5 掳, the 2-D flow field of the main beam section under the construction state (without railing and overhaul track) and the completed state (with railing and overhaul track) of Lingding suspension bridge are calculated, respectively, and the flutter derivatives are identified. The flutter critical wind speed of four conceptual design schemes of suspension bridge at different angles of attack is calculated. The flutter derivative of the bridge agrees well with the wind tunnel test data of the same section of the box girder of Humen second Bridge. The introduction of railing and overhaul track reduces the critical flutter velocity of the bridge, and with the increase of the absolute value of the wind attack angle, the flutter critical wind speed of the bridge is reduced with the increase of the wind attack angle. The aerodynamic profile of the main beam section gradually becomes worse, the critical flutter velocity of each suspension bridge is decreasing, and the critical flutter velocity is the lowest and the flutter stability is the worst at the 5 掳wind attack angle. Based on the requirements of flutter stability, the optimization test of pneumatic control measures is carried out. The central slotted plate, the central slotted plate plus vertical stabilizing plate, the central slotted plate and the inner slot-stabilized plate are adopted. A new section model with pneumatic control measures is formed by central slot and vertical side stabilizing plate. Flutter analysis is carried out under the most unfavorable wind attack angle. The results of aerodynamic control measures are evaluated. It is found that the central slot method can obviously improve the flutter performance of the section. The influence of the position of the stabilizer plate on the flutter performance of the section is different. The central stable plate and the inclined plate in the slot can effectively increase the critical flutter velocity of the section, while the vertical side stabilizing plate decreases the critical flutter velocity of the section. The combination of central slotted plate and central stabilizer plate is recommended as the final flutter improvement aerodynamic method in this paper.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.25;U441.3
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