斜拉索风雨激振数值模拟及其机理探究

发布时间：2018-03-27 12:14

本文选题：风雨激振　切入点：水线　出处：《振动与冲击》2017年11期

【摘要】：将滑移理论与CFD技术相结合,考虑了风压力系数和风摩擦因数随位置和时间的变化,并引入了Spalart-Allmaras(S-A)湍流模型,运用有限单元法,实现了对斜拉索的风雨激振现象的数值模拟;考察了不同风速下的水线形成及形态,并与已有实验成果进行比对,验证了方法的合理性和准确性;研究了水膜形态、气动力变化、斜拉索振动响应三者关系,得到了水线和拉索之间的振动耦合规律,探讨了风雨激振机理。结果表明,水线、气流和斜拉索之间的共振是引发风雨激振的主要因素之一。
[Abstract]:The slip theory and CFD technique are combined to consider the variation of wind pressure coefficient and wind friction coefficient with the position and time. Spalart-Allmaras S-A) turbulence model is introduced, and the finite element method is used to simulate the wind and rain excitation phenomenon of stay cables. The formation and shape of waterline under different wind speeds were investigated, and compared with the experimental results, the rationality and accuracy of the method were verified, and the relationships among water film shape, aerodynamic change and vibration response of stay cable were studied. The vibration coupling law between waterline and cable is obtained and the mechanism of wind-induced vibration is discussed. The results show that the resonance between waterline, airflow and stay cable is one of the main factors causing wind-induced vibration.
【作者单位】：天津大学建筑工程学院;滨海土木工程结构与安全教育部重点实验室;天津城建大学土木工程学院;天津软土特性与工程环境重点实验室;
【基金】：国家自然科学基金(51408399)
【分类号】：U441.3

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