栏杆构造对Π型桥梁断面涡激振动的影响研究
发布时间：2018-09-14 18:26
【摘要】：近些年来,随着桥梁设计和施工水平的不断提高,桥梁跨径急剧增加,桥梁结构趋于大跨、轻质、低阻尼,使得桥梁涡激振动的研究越来越重要。在桥梁设计中,Π型桥梁断面因其具有良好的经济性,开始广泛应用于大跨径桥梁中。对于Π型桥梁断面的涡激共振问题,国内外很多学者做了大量研究,但对于栏杆构造因素对Π型桥梁断面涡激振动的影响很少有学者进行较为系统的研究。因而对于栏杆构造因素对Π型桥梁断面涡激振动影响的研究以及通过栏杆构造的设计避免涡激共振或者抑制其振动幅值的研究实际工程应用意义重大。论文选取鳌江特大桥Π型主梁断面为工程背景,依托风洞试验研究栏杆透风率对Π型桥梁断面涡激振动的影响。并采用数值模拟技术就栏杆横梁断面型式、高度、倾角等风洞试验较难实现的构造因素对Π型桥梁断面涡激振动的影响进行研究,得到抑制Π型桥梁断面涡激振动的栏杆优化断面、参数化高度因子λ、合理倾角θ及透风率φ,为该类断面桥梁在抗风设计时提供参考。最后从绕流流场速度和涡量、表面压力系数与根方差值等方面微观解释栏杆构造影响Π型桥梁断面涡激振动的内在原因并验证了数值计算结果的正确性。
[Abstract]:In recent years, with the continuous improvement of bridge design and construction level, the span of bridge increases dramatically, and the bridge structure tends to long span, light weight and low damping, which makes the study of vortex-induced vibration of bridge more and more important. In the design of bridge, due to its good economy, the cross section of 蟺 type bridge has been widely used in long span bridges. Many scholars at home and abroad have done a great deal of research on the vortex-induced resonance of the section of a 蟺 type bridge, but few scholars have systematically studied the influence of railing structure on the vortex-induced vibration of the section of the 蟺 type bridge. Therefore, it is of great significance to study the influence of railing structure factors on the vortex-induced vibration of the section of the 蟺 type bridge and to study the practical engineering application of avoiding the vortex-induced resonance or suppressing the vibration amplitude through the design of the railing structure. In this paper, based on wind tunnel test, the influence of railing air permeability on the vortex-induced vibration of the cross section of A large bridge is studied. Numerical simulation technique is used to study the influence of structural factors such as section type, height and inclination angle of railing beam on the vortex-induced vibration of the section of a 蟺 type bridge, which is difficult to realize in wind tunnel tests. The optimized section of railing, the parameterized height factor 位, the reasonable inclination 胃 and the air permeability 蠁, which can suppress the vortex-induced vibration of the section of the 蟺 type bridge, are obtained, which provides a reference for the design of this type of cross-section bridge in the wind-resistant design. Finally, the internal reasons of the influence of railing structure on the vortex-induced vibration of the cross section of a 蟺 type bridge are explained from the aspects of velocity and vorticity over the flow field, the difference between the surface pressure coefficient and the root square, and the correctness of the numerical results is verified.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3
[Abstract]:In recent years, with the continuous improvement of bridge design and construction level, the span of bridge increases dramatically, and the bridge structure tends to long span, light weight and low damping, which makes the study of vortex-induced vibration of bridge more and more important. In the design of bridge, due to its good economy, the cross section of 蟺 type bridge has been widely used in long span bridges. Many scholars at home and abroad have done a great deal of research on the vortex-induced resonance of the section of a 蟺 type bridge, but few scholars have systematically studied the influence of railing structure on the vortex-induced vibration of the section of the 蟺 type bridge. Therefore, it is of great significance to study the influence of railing structure factors on the vortex-induced vibration of the section of the 蟺 type bridge and to study the practical engineering application of avoiding the vortex-induced resonance or suppressing the vibration amplitude through the design of the railing structure. In this paper, based on wind tunnel test, the influence of railing air permeability on the vortex-induced vibration of the cross section of A large bridge is studied. Numerical simulation technique is used to study the influence of structural factors such as section type, height and inclination angle of railing beam on the vortex-induced vibration of the section of a 蟺 type bridge, which is difficult to realize in wind tunnel tests. The optimized section of railing, the parameterized height factor 位, the reasonable inclination 胃 and the air permeability 蠁, which can suppress the vortex-induced vibration of the section of the 蟺 type bridge, are obtained, which provides a reference for the design of this type of cross-section bridge in the wind-resistant design. Finally, the internal reasons of the influence of railing structure on the vortex-induced vibration of the cross section of a 蟺 type bridge are explained from the aspects of velocity and vorticity over the flow field, the difference between the surface pressure coefficient and the root square, and the correctness of the numerical results is verified.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3
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