大跨度斜拉桥施工阶段抗风及控制措施研究
发布时间：2018-07-25 06:01
【摘要】：随着桥梁跨度的不断增长,桥梁的刚度逐渐减小,成为风致振动敏感结构,使得不少大跨度桥梁在施工期以及运营阶段需要采用一些抗风减振措施来提高其抗风安全性和使用舒适性。特别对于一些处于沿海地区、有着重要交通安全性的大跨度桥梁,抗风减振的研究显得尤其重要。除了使用阶段的抗风设计外,施工阶段由于结构刚度尚未形成,风致响应水平较大,因此对于此类大跨斜拉桥在施工阶段的风致振动减振研究,以及提出抗风的预案和措施,也是十分必要的。本文以我国某大跨度斜拉桥为工程背景,在风洞试验和理论计算分析的基础上,对该桥在施工阶段的自立索塔状态,主梁的最大单双悬臂状态以及斜拉索的抗风性能进行了分析和评估。首先,基于该桥自立索塔气弹模型风洞试验结果,对其结构的风致振动性能进行了分析评估,并讨论了塔吊对其结构抗风性能的影响,提出了桥塔风致振动减振措施。其次,对该桥施工期主梁最大单、双悬臂两个最不利条件下的抖振响应进行了计算,并对塔梁临时固结、梁端设置抗风缆索和抗风锚碇等措施进行了计算和评估。最后,对该桥斜拉索的风致振动(涡激振动和参数振动)问题及减振措施进行了讨论。
[Abstract]:With the continuous increase of the span of the bridge, the stiffness of the bridge decreases gradually and becomes a wind-induced vibration sensitive structure. Many long-span bridges need to adopt some anti-wind vibration measures to improve their anti-wind safety and comfort during the construction period and operation stage. Especially for some long-span bridges with important traffic safety in coastal areas, the study of anti-wind vibration is particularly important. In addition to the wind-resistant design in the use stage, since the structural stiffness has not yet been formed and the wind-induced response level is large in the construction stage, the wind-induced vibration reduction of this long-span cable-stayed bridge in the construction phase is studied, and the anti-wind plan and measures are put forward. It is also very necessary. On the basis of wind tunnel test and theoretical calculation, this paper takes a long-span cable-stayed bridge in China as the engineering background, and analyzes the self-supporting tower state of the bridge in the construction stage. The maximum single and double cantilever state of the main beam and the wind resistance of the stay cable are analyzed and evaluated. Firstly, based on the wind tunnel test results of the self-supporting cable tower, the wind-induced vibration performance of its structure is analyzed and evaluated, and the influence of tower crane on the wind-resistant performance of the structure is discussed, and the measures to reduce the wind-induced vibration of the bridge tower are put forward. Secondly, the buffeting responses of the main girder under two most unfavorable conditions during the construction of the bridge are calculated and evaluated, such as temporary consolidation of the tower and beam, installation of wind-resistant cables and Anchorage at the end of the girder, etc. Finally, the wind-induced vibration (vortex-induced vibration and parametric vibration) of the cable-stayed cable of the bridge and its damping measures are discussed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
，
本文编号：2142819
[Abstract]:With the continuous increase of the span of the bridge, the stiffness of the bridge decreases gradually and becomes a wind-induced vibration sensitive structure. Many long-span bridges need to adopt some anti-wind vibration measures to improve their anti-wind safety and comfort during the construction period and operation stage. Especially for some long-span bridges with important traffic safety in coastal areas, the study of anti-wind vibration is particularly important. In addition to the wind-resistant design in the use stage, since the structural stiffness has not yet been formed and the wind-induced response level is large in the construction stage, the wind-induced vibration reduction of this long-span cable-stayed bridge in the construction phase is studied, and the anti-wind plan and measures are put forward. It is also very necessary. On the basis of wind tunnel test and theoretical calculation, this paper takes a long-span cable-stayed bridge in China as the engineering background, and analyzes the self-supporting tower state of the bridge in the construction stage. The maximum single and double cantilever state of the main beam and the wind resistance of the stay cable are analyzed and evaluated. Firstly, based on the wind tunnel test results of the self-supporting cable tower, the wind-induced vibration performance of its structure is analyzed and evaluated, and the influence of tower crane on the wind-resistant performance of the structure is discussed, and the measures to reduce the wind-induced vibration of the bridge tower are put forward. Secondly, the buffeting responses of the main girder under two most unfavorable conditions during the construction of the bridge are calculated and evaluated, such as temporary consolidation of the tower and beam, installation of wind-resistant cables and Anchorage at the end of the girder, etc. Finally, the wind-induced vibration (vortex-induced vibration and parametric vibration) of the cable-stayed cable of the bridge and its damping measures are discussed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
，
本文编号：2142819
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