大跨度連續(xù)梁拱組合橋氣動特性及風致響應研究
本文選題:連續(xù)梁拱組合橋 + 數(shù)值模擬 ; 參考:《西南交通大學》2017年碩士論文
【摘要】:連續(xù)梁拱組合橋將連續(xù)梁橋和拱橋的優(yōu)點結合與一體,其結構穩(wěn)定、造型優(yōu)美,在高鐵建設工程中逐漸得到推廣應用。隨著工程技術的進步,該類橋梁也逐漸向大跨輕柔方向發(fā)展,風致振動問題逐漸凸顯,對成橋運營階段的行車安全及舒適度影響不容忽視,因此有必要開展大跨度連續(xù)梁拱組合橋風致振動研究。本文以某連續(xù)梁拱組合橋為工程背景,對該橋的氣動特性及風致響應進行研究,為同類型橋梁抗風研究提供參考。論文的主要工作如下:1.采用CFD數(shù)值模擬方法建立全橋三維足尺風場計算模型,對結構氣動特性進行研究,為類似結構求解氣動參數(shù)提供參考;分析了風攻角、橋下凈高和護欄對結構氣動特性的影響規(guī)律,為橋梁結構進行三維數(shù)值風場模擬研究提供參考。2.采用大型通用有限元軟件ANSYS建立連續(xù)梁拱組合橋有限元模型,分析了結構的動力特性,對結構靜風響應進行分析,重點分析了結構幾何非線性對靜風響應的影響;研究了風速和風攻角對橋梁結構靜風響應的影響規(guī)律。3.考慮了連續(xù)梁拱組合橋的結構特點及自然風特性,合理簡化風場,編制相應程序實現(xiàn)三維脈動風場模擬,對結構進行抖振時域響應分析計算,分析了結構幾何非線性對抖振響應的影響;研究了風速和風攻角對結構抖振響應的影響規(guī)律;總結分析風致響應結果,為抗風設計研究提供一些有益結論。
[Abstract]:Continuous beam-arch composite bridge combines the advantages of continuous beam bridge and arch bridge, its structure is stable and its shape is beautiful, so it has been gradually popularized and applied in the construction of high-speed railway. With the progress of engineering technology, this kind of bridge is gradually developing to the direction of long span and soft, the problem of wind-induced vibration is gradually prominent, and the influence on the driving safety and comfort in the operation stage of the bridge can not be ignored. So it is necessary to study the wind-induced vibration of long-span continuous beam-arch composite bridge. In this paper, the aerodynamic characteristics and wind-induced response of a continuous beam and arch composite bridge are studied in order to provide a reference for the study of wind-resistant bridge of the same type. The main work of the thesis is as follows: 1: 1. The full-bridge full-scale wind field calculation model is established by using CFD numerical simulation method, and the aerodynamic characteristics of the structure are studied, which provides a reference for solving aerodynamic parameters of similar structures, and analyzes the wind attack angle. The influence of the net height under the bridge and the guardrail on the aerodynamic characteristics of the structure provides a reference for the three-dimensional numerical wind field simulation of the bridge structure. The finite element model of continuous beam-arch composite bridge is established by using the large-scale general finite element software ANSYS. The dynamic characteristics of the structure are analyzed, the static wind response of the structure is analyzed, and the influence of the geometric nonlinearity of the structure on the static wind response is emphatically analyzed. The influence of wind speed and angle of attack on static wind response of bridge structure is studied. Considering the structural characteristics and natural wind characteristics of the continuous beam-arch composite bridge, the wind field is reasonably simplified, the corresponding program is compiled to simulate the three-dimensional pulsating wind field, and the buffeting time domain response is analyzed and calculated. The effect of geometric nonlinearity on buffeting response is analyzed, the influence of wind speed and angle of attack on buffeting response is studied, and the results of wind-induced response are summarized and analyzed, which provides some useful conclusions for the study of wind-resistant design.
【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
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