紊流風速場的數(shù)值模擬及橋梁風振響應分析
發(fā)布時間:2019-04-11 19:02
【摘要】:摘要: 建于大風區(qū)的鐵路橋梁受到風荷載的作用會受到很大的激振,對其進行研究是保證結構安全及橋上車輛運行安全的重要前提。本文以蘭新第二雙線鐵路為工程背景,對風區(qū)橋梁的紊流風速場進行了數(shù)值模擬,并計算了橋梁的風振響應。全文的主要內(nèi)容及成果如下: (1)對國內(nèi)外橋梁的風振破壞進行了回顧,闡明了橋梁風致振動原理,介紹了研究強風作用下橋梁動力響應的重要性。并以蘭新線為工程背景,重點介紹了蘭新線所受風災情況。 (2)基于隨機過程分析理論,介紹了兩種紊流風速場的數(shù)值模擬方法:線性濾波法和諧波合成法。 (3)基于蘭新第二雙線鐵路風區(qū)跨度32m簡支箱梁和16m簡支槽型梁的設計,對其進行有限元建模,分析了結構的自振特性。 (4)采用諧波合成法對橋址處的紊流風速場進行數(shù)值模擬,根據(jù)風洞試驗得到的三分力系數(shù)結果,生成橋梁各節(jié)點的靜風力和抖振風力。 (5)多工況計算分析了風荷載作用下橋梁的動力響應,得到了一些有意義的結論。
[Abstract]:Abstract: the railway bridge built in the windy area will be greatly excited by wind load, so the research on it is an important prerequisite to ensure the safety of the structure and the running safety of the vehicle on the bridge. In this paper, the turbulent wind velocity field of the bridge in the wind region is numerically simulated and the wind-induced vibration response of the bridge is calculated based on the engineering background of the second double-track railway in Lanxin. The main contents and achievements of this paper are as follows: (1) the wind-induced vibration of bridges at home and abroad is reviewed, the principle of wind-induced vibration of bridges is expounded, and the importance of studying the dynamic response of bridges under strong wind is introduced. Taking Lanxin Line as the engineering background, the wind disaster situation of Lanxin Line is introduced emphatically. (2) based on the theory of stochastic process analysis, two numerical simulation methods of turbulent wind velocity field are introduced: linear filtering method and harmonic synthesis method. (3) based on the design of 32m simply supported box girder and 16m simply supported slot beam in the wind zone of Lanxin second double-track railway, the finite element modeling is carried out and the natural vibration characteristics of the structure are analyzed. (4) numerical simulation of turbulent wind velocity field at bridge site is carried out by harmonic synthesis method. According to the results of wind tunnel test, static and chattering wind forces of each node of bridge are generated. (5) the dynamic response of the bridge under wind load is calculated and analyzed under multi-conditions, and some meaningful conclusions are obtained.
【學位授予單位】:北京交通大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:U441.3
本文編號:2456668
[Abstract]:Abstract: the railway bridge built in the windy area will be greatly excited by wind load, so the research on it is an important prerequisite to ensure the safety of the structure and the running safety of the vehicle on the bridge. In this paper, the turbulent wind velocity field of the bridge in the wind region is numerically simulated and the wind-induced vibration response of the bridge is calculated based on the engineering background of the second double-track railway in Lanxin. The main contents and achievements of this paper are as follows: (1) the wind-induced vibration of bridges at home and abroad is reviewed, the principle of wind-induced vibration of bridges is expounded, and the importance of studying the dynamic response of bridges under strong wind is introduced. Taking Lanxin Line as the engineering background, the wind disaster situation of Lanxin Line is introduced emphatically. (2) based on the theory of stochastic process analysis, two numerical simulation methods of turbulent wind velocity field are introduced: linear filtering method and harmonic synthesis method. (3) based on the design of 32m simply supported box girder and 16m simply supported slot beam in the wind zone of Lanxin second double-track railway, the finite element modeling is carried out and the natural vibration characteristics of the structure are analyzed. (4) numerical simulation of turbulent wind velocity field at bridge site is carried out by harmonic synthesis method. According to the results of wind tunnel test, static and chattering wind forces of each node of bridge are generated. (5) the dynamic response of the bridge under wind load is calculated and analyzed under multi-conditions, and some meaningful conclusions are obtained.
【學位授予單位】:北京交通大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:U441.3
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