本文選題：大跨度窄懸索橋　切入點(diǎn)：鋼桁加勁梁　出處：《蘭州交通大學(xué)》2015年碩士論文

【摘要】：本文就山區(qū)窄鋼桁加勁梁懸索橋抗風(fēng)問題這一風(fēng)工程領(lǐng)域的難點(diǎn)問題,探討了一個(gè)涉及窄鋼桁懸索橋的靜風(fēng)穩(wěn)定、動力特性、顫振穩(wěn)定等多方面的研究課題。另外,還側(cè)重于該種橋型施工暫態(tài)抗風(fēng)的這一大跨度橋梁施工中的重、難點(diǎn)問題。窄鋼桁懸索橋在施工過程中風(fēng)環(huán)境比較復(fù)雜、工期較長、結(jié)構(gòu)剛度較低,很可能出現(xiàn)成橋時(shí)不會發(fā)生的風(fēng)效應(yīng);再者,考慮到施工期人員的安全性和舒適性以及工作時(shí)間,因此,施工暫態(tài)風(fēng)致穩(wěn)定的重要性非同小可。本文以剛剛建成的劉家峽特大懸索橋?yàn)橐劳?詳細(xì)闡述了該橋型處于施工暫態(tài)期間結(jié)構(gòu)抗風(fēng)的安全性問題。具體所做的工作如下:首先,簡要陳述了橋梁風(fēng)工程的發(fā)展以及現(xiàn)狀。簡述風(fēng)致靜風(fēng)穩(wěn)定和顫振穩(wěn)定國內(nèi)外的研究情況及其發(fā)展方向。其次,簡明介紹了懸索橋靜風(fēng)穩(wěn)定性分析理論和方法,包括如何描述非線性靜風(fēng)荷載。建立了劉家峽大橋成橋狀態(tài)的三維有限元模型,采用Newton Raphson迭代數(shù)值計(jì)算法在ANSYS中對其進(jìn)行了非線性靜風(fēng)穩(wěn)定性的全過程分析,同時(shí)驗(yàn)證了劉家峽大橋靜風(fēng)穩(wěn)定性。第三,以劉家峽大橋?yàn)槔?對窄鋼桁加勁梁懸索橋成橋及施工過程中動力特性進(jìn)行了研究分析,給出成橋狀態(tài)動力特性結(jié)果及各典型施工暫態(tài)之間動力特性的變化趨勢,得到了該橋施工過程中動力特性變化的一般規(guī)律。最后,利用APDL參數(shù)化程序并基于ANSYS有限元工具,探究了劉家峽懸索橋施工暫態(tài)顫振性能及吊裝方案對懸索橋施工暫態(tài)顫振穩(wěn)定性的影響。利用顫振時(shí)域分析方法將得到的結(jié)果與試驗(yàn)結(jié)果進(jìn)行對比。同時(shí),驗(yàn)證了方法的可行性及正確性。對該橋分別采用幾種吊梁方案以及非對稱吊裝方案,對比各種情況下施工暫態(tài)顫振穩(wěn)定性結(jié)果,從而獲得了施工階段顫振臨界風(fēng)速的遞變趨勢和有效提高窄加勁梁懸索橋施工期顫振穩(wěn)定性的措施。
[Abstract]:In this paper, the wind resistance problem of narrow steel truss stiffened girder suspension bridge in mountainous area is discussed, and a study on static wind stability, dynamic characteristics and flutter stability of narrow steel truss suspension bridge is discussed. The paper also emphasizes on the heavy and difficult problems in the construction of this kind of long-span bridge, which is transient wind-resistant. The narrow steel truss suspension bridge has complicated stroke environment, long construction period and low structural stiffness during construction. It is likely that the wind effect will not occur when the bridge is completed; furthermore, considering the safety and comfort of the personnel during the construction period and the working hours, therefore, The importance of transient wind-induced stability in construction is not trivial. Based on the newly built Liujiaxia suspension bridge, this paper expounds in detail the safety of the structure during the transient construction period. The specific works are as follows: first of all, The development and present situation of bridge wind engineering are briefly described. The research situation and development direction of wind-induced static wind stability and flutter stability at home and abroad are briefly described. Secondly, the theory and method of static wind stability analysis for suspension bridges are briefly introduced. Including how to describe nonlinear static wind load, a three-dimensional finite element model of the bridge state of Liujiaxia Bridge is established, and the full process analysis of nonlinear static wind stability is carried out by using Newton Raphson iterative numerical method in ANSYS. At the same time, the static wind stability of the Liujiaxia Bridge is verified. Thirdly, taking the Liujiaxia Bridge as an example, the dynamic characteristics of the suspension bridge with narrow steel truss stiffened beam and during construction are studied and analyzed. The dynamic characteristics of the bridge and the variation trend of the dynamic characteristics among the typical construction transient are given, and the general law of the dynamic characteristics during the bridge construction is obtained. Finally, using the APDL parameterization program and the ANSYS finite element tool, the dynamic characteristics of the bridge are obtained. The effect of construction transient flutter performance and hoisting scheme of Liujiaxia suspension bridge on the transient flutter stability of suspension bridge is investigated. The results obtained by time-domain flutter analysis are compared with the experimental results. The feasibility and correctness of the method are verified. For the bridge, several kinds of hoisting schemes and asymmetric hoisting schemes are adopted, and the results of transient flutter stability under various conditions are compared. The trend of flutter critical wind speed in construction stage and the measures to improve flutter stability of narrow stiffened girder suspension bridge during construction are obtained.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U445;U448.25

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