考慮山區(qū)風非均勻性的鐵路懸索橋抖振分析
發(fā)布時間：2019-06-27 15:40
【摘要】：隨著社會的持續(xù)發(fā)展,橋梁的跨度也不斷增加,橋梁對風荷載作用的敏感性越來越凸顯出來。而山區(qū)由于地形復雜,風場變化多樣,風荷載對橋梁的作用也更加明顯。抖振作為橋梁風致振動的四種主要類型之一,盡管不至于對橋梁結(jié)構(gòu)產(chǎn)生災(zāi)難性的破壞,但是對橋梁結(jié)構(gòu)的疲勞耐久度以及行車舒適性等方面有著非常重要的影響。對于抖振響應(yīng),以往有許多研究者對其進行了深入研究,但是,考慮山區(qū)風非均勻性影響下的抖振響應(yīng)分析研究甚少。本文著重引入了山區(qū)風非均勻性作為主要研究對象進行了細致深入的抖振響應(yīng)分析,研究內(nèi)容如下:(1)對大跨度懸索橋的發(fā)展歷史進行了概括,同時引出了隨著大跨度橋梁發(fā)展而發(fā)展起來的新學科——橋梁風工程,并且介紹了橋梁風致振動現(xiàn)象及其相關(guān)的研究方法;(2)將山區(qū)橋址處的峽谷模擬成倒梯形斷面,在CAD中建立其模型,然后在網(wǎng)格劃分軟件ICEM中進行網(wǎng)格劃分,最后采用FLUENT軟件進行數(shù)值模擬,得到橋址處山區(qū)風的風速分布特征,并將其擬合得到風速沿橋軸線方向分布曲線;(3)采用ANSYS軟件建立全橋有限元模型,計算出全橋成橋態(tài)的動力特性;(4)采用抖振頻域分析程序進行抖振響應(yīng)計算,包括抖振位移響應(yīng)、抖振內(nèi)力響應(yīng)和抖振加速度響應(yīng)。分別討論了是否考慮風速沿橋軸線方向不均勻分布的抖振響應(yīng)和氣動導納函數(shù)值在取1和Sears函數(shù)時的抖振響應(yīng),并對其結(jié)果進行了對比分析。
[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.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U441.3;U448.25
本文編號：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.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U441.3;U448.25
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，本文編號：2506922
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