考虑特征紊流影响的大跨桥梁静风稳定分析方法
发布时间：2018-07-16 16:40
【摘要】：为了研究特征紊流抖振力对大跨度桥梁静风稳定性的影响,提出了特征紊流气动力模型,建立了考虑特征紊流影响的大跨度桥梁静风稳定分析方法。通过采用风洞实测气动力系数谱模拟特征紊流气动力系数时程,利用动力有限元算法计算了西堠门大桥的位移响应,分析了特征紊流对其静风稳定的影响。结果表明:结构仅仅是在平衡位置附近作微幅振动,特征紊流对西堠门大桥静风稳定临界风速和失稳形态没有明显影响。主要是因为特征紊流是窄带的随机过程,其能量主要集中在某一个频率附近,对西堠门大桥而言,该频率远高于结构的基频,所以特征紊流气动力未能激起较大的位移响应。
[Abstract]:In order to study the influence of the characteristic turbulent buffeting force on the static wind stability of a long-span bridge beam, a characteristic turbulence aerodynamic model is proposed, and a static wind stability analysis method for large span bridge beams with the influence of characteristic turbulence is established. The dynamic finite element algorithm is used to simulate the turbulent aerodynamic coefficient time history of the characteristic turbulent flow by using the measured aerodynamic coefficient spectrum of the wind tunnel. The effect of the characteristic turbulence on the static wind stability is analyzed. The results show that the structure is only the micro amplitude vibration near the equilibrium position, and the characteristic turbulence has no obvious influence on the critical wind speed and the instability form of the static wind stability of the West Gate Bridge, mainly because the characteristic turbulence is a random process of narrow band. The energy is mainly concentrated at a certain frequency, and the frequency is far higher than the basic frequency of the structure, so the characteristic turbulent aerodynamic force does not arouse the larger displacement response.
【作者单位】： 东南大学混凝土及预应力混凝土结构教育部重点实验室;同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金项目(51208104) 江苏省自然科学基金项目(BK2012344) 教育部高等学校博士学科点专项科研基金课题项目(20120092120018) 江苏省高校优势学科建设工程项目(PAPD)
【分类号】：U441.3
[Abstract]:In order to study the influence of the characteristic turbulent buffeting force on the static wind stability of a long-span bridge beam, a characteristic turbulence aerodynamic model is proposed, and a static wind stability analysis method for large span bridge beams with the influence of characteristic turbulence is established. The dynamic finite element algorithm is used to simulate the turbulent aerodynamic coefficient time history of the characteristic turbulent flow by using the measured aerodynamic coefficient spectrum of the wind tunnel. The effect of the characteristic turbulence on the static wind stability is analyzed. The results show that the structure is only the micro amplitude vibration near the equilibrium position, and the characteristic turbulence has no obvious influence on the critical wind speed and the instability form of the static wind stability of the West Gate Bridge, mainly because the characteristic turbulence is a random process of narrow band. The energy is mainly concentrated at a certain frequency, and the frequency is far higher than the basic frequency of the structure, so the characteristic turbulent aerodynamic force does not arouse the larger displacement response.
【作者单位】： 东南大学混凝土及预应力混凝土结构教育部重点实验室;同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金项目(51208104) 江苏省自然科学基金项目(BK2012344) 教育部高等学校博士学科点专项科研基金课题项目(20120092120018) 江苏省高校优势学科建设工程项目(PAPD)
【分类号】：U441.3
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