考虑山区风非均匀性的铁路悬索桥抖振分析
发布时间：2019-06-27 15:40
【摘要】：随着社会的持续发展,桥梁的跨度也不断增加,桥梁对风荷载作用的敏感性越来越凸显出来。而山区由于地形复杂,风场变化多样,风荷载对桥梁的作用也更加明显。抖振作为桥梁风致振动的四种主要类型之一,尽管不至于对桥梁结构产生灾难性的破坏,但是对桥梁结构的疲劳耐久度以及行车舒适性等方面有着非常重要的影响。对于抖振响应,以往有许多研究者对其进行了深入研究,但是,考虑山区风非均匀性影响下的抖振响应分析研究甚少。本文着重引入了山区风非均匀性作为主要研究对象进行了细致深入的抖振响应分析,研究内容如下:(1)对大跨度悬索桥的发展历史进行了概括,同时引出了随着大跨度桥梁发展而发展起来的新学科——桥梁风工程,并且介绍了桥梁风致振动现象及其相关的研究方法;(2)将山区桥址处的峡谷模拟成倒梯形断面,在CAD中建立其模型,然后在网格划分软件ICEM中进行网格划分,最后采用FLUENT软件进行数值模拟,得到桥址处山区风的风速分布特征,并将其拟合得到风速沿桥轴线方向分布曲线;(3)采用ANSYS软件建立全桥有限元模型,计算出全桥成桥态的动力特性;(4)采用抖振频域分析程序进行抖振响应计算,包括抖振位移响应、抖振内力响应和抖振加速度响应。分别讨论了是否考虑风速沿桥轴线方向不均匀分布的抖振响应和气动导纳函数值在取1和Sears函数时的抖振响应,并对其结果进行了对比分析。
[Abstract]:With the sustainable development of society, the span of the bridge is also increasing, and the sensitivity of the bridge to wind load is becoming more and more prominent. Because of the complexity of terrain and the variety of wind field, the effect of wind load on bridge is more obvious. Buffeting, as one of the four main types of wind-induced vibration of bridges, has a very important influence on the fatigue durability and driving comfort of bridge structures, although it does not cause catastrophic damage to bridge structures. For buffeting response, many researchers have studied buffeting response in the past, but there is little research on buffeting response under the influence of wind inhomogeneity in mountain areas. In this paper, the wind inhomogeneity in mountain area is introduced as the main research object to analyze the buffeting response carefully and deeply. The research contents are as follows: (1) the development history of long-span suspension bridge is summarized, and the bridge wind engineering, a new subject developed with the development of long-span bridge, is introduced, and the wind-induced vibration phenomenon of bridge and its related research methods are introduced. (2) the canyon at the bridge site in the mountain area is simulated into an inverted ladder section, and its model is established in CAD, and then the grid is divided in the grid division software ICEM. Finally, the wind speed distribution characteristics of the mountain wind at the bridge site are obtained by using FLUENT software, and the distribution curve of wind speed along the axis of the bridge is obtained. (3) the finite element model of the whole bridge is established by using ANSYS software to calculate the dynamic characteristics of the bridge. (4) buffeting response is calculated by buffeting frequency domain analysis program, including buffeting displacement response, buffeting internal force response and buffeting acceleration response. Whether or not to consider the buffeting response of uneven distribution of wind speed along the axis of the bridge and the buffeting response of pneumatic admittance function when 1 and Sears functions are taken into account are discussed respectively, and the results are compared and analyzed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441.3;U448.25
本文编号：2506922
[Abstract]:With the sustainable development of society, the span of the bridge is also increasing, and the sensitivity of the bridge to wind load is becoming more and more prominent. Because of the complexity of terrain and the variety of wind field, the effect of wind load on bridge is more obvious. Buffeting, as one of the four main types of wind-induced vibration of bridges, has a very important influence on the fatigue durability and driving comfort of bridge structures, although it does not cause catastrophic damage to bridge structures. For buffeting response, many researchers have studied buffeting response in the past, but there is little research on buffeting response under the influence of wind inhomogeneity in mountain areas. In this paper, the wind inhomogeneity in mountain area is introduced as the main research object to analyze the buffeting response carefully and deeply. The research contents are as follows: (1) the development history of long-span suspension bridge is summarized, and the bridge wind engineering, a new subject developed with the development of long-span bridge, is introduced, and the wind-induced vibration phenomenon of bridge and its related research methods are introduced. (2) the canyon at the bridge site in the mountain area is simulated into an inverted ladder section, and its model is established in CAD, and then the grid is divided in the grid division software ICEM. Finally, the wind speed distribution characteristics of the mountain wind at the bridge site are obtained by using FLUENT software, and the distribution curve of wind speed along the axis of the bridge is obtained. (3) the finite element model of the whole bridge is established by using ANSYS software to calculate the dynamic characteristics of the bridge. (4) buffeting response is calculated by buffeting frequency domain analysis program, including buffeting displacement response, buffeting internal force response and buffeting acceleration response. Whether or not to consider the buffeting response of uneven distribution of wind speed along the axis of the bridge and the buffeting response of pneumatic admittance function when 1 and Sears functions are taken into account are discussed respectively, and the results are compared and analyzed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441.3;U448.25
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，本文编号：2506922
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