本文選題：鋼管混凝土系桿拱橋 + 動力特性��； 參考：《合肥工業(yè)大學(xué)》2014年碩士論文

【摘要】：鋼管混凝土系桿拱橋由于承載能力高、跨越能力強、抗震性能好、施工方便、結(jié)構(gòu)美觀等優(yōu)點而被廣泛的應(yīng)用于實際工程項目當中，但是鋼管混凝土系桿拱橋的動力特性和抗震分析的研究相對其他類型的橋梁而言還特別少。近年來，我國的地震處于高頻發(fā)生期，常使橋梁結(jié)構(gòu)發(fā)生破壞，造成交通中斷，延緩抗震救災(zāi)，從而導(dǎo)致次生災(zāi)害加重，進一步加重了地震災(zāi)情。因此研究鋼管混凝土系桿拱橋的動力特性和抗震性分析是非常必要的，以便深入了解其動力特性與地震反應(yīng)特性，為橋梁抗震設(shè)計與分析提供科學(xué)的依據(jù)。本文以合福高鐵跨越合肥市金寨路的大跨度下承式鋼管混凝土系桿拱橋為研究對象，利用大型有限元軟件Midas/Civil對該橋的動力特性及地震響應(yīng)進行計算分析，主要做了如下內(nèi)容： 1、介紹了鋼管混凝土結(jié)構(gòu)的發(fā)展及特點、系桿拱橋的特性、橋梁結(jié)構(gòu)的抗震分析方法、橋梁的地震破壞類型以及鋼管混凝土拱橋的抗震研究現(xiàn)狀。 2、闡述了結(jié)構(gòu)抗震動力學(xué)基本概念、結(jié)構(gòu)的抗震設(shè)防目標、橋梁的延性抗震設(shè)計、基于性能的橋梁抗震設(shè)計的基本理論。 3、介紹了該橋的工程概況，有限元模型的建立，分析了該橋的靜動力特性，以及在各階振型下的振動特征。 4、介紹了反應(yīng)譜法的概況、基本原理和使用條件，對該橋進行了有列車荷載和無列車荷載下的反應(yīng)譜地震響應(yīng)分析，得出了該橋主拱肋、橋墩、系梁等在地震作用下的響應(yīng)。 5、介紹了動態(tài)時程法的概況、基本原理和使用條件，，對該橋進行了動態(tài)時程地震響應(yīng)分析，得出了該橋主拱肋、橋墩、系梁等在地震響應(yīng)下的內(nèi)力及位移值及其隨時間的變化規(guī)律，通過有列車和無列車兩種情況對比，計算高速列車荷載對地震響應(yīng)的影響。 6、將地震反應(yīng)譜分析法和地震動力時程分析法的結(jié)果相比較,得出兩種地震方法的各自特點。 7、對全文進行了歸納總結(jié)，介紹了本論文中的一些不足之處以及以后需要研究的方向。
[Abstract]:Concrete-filled steel tubular tied arch bridge is widely used in practical projects because of its high bearing capacity, strong span capacity, good seismic performance, convenient construction and beautiful structure. However, the dynamic characteristics and seismic analysis of concrete-filled steel tubular tied arch bridges are less than other types of bridges. In recent years, the earthquakes in our country are in the period of high frequency occurrence, which often cause damage to the bridge structure, cause traffic interruption, delay the earthquake relief, and lead to the aggravation of secondary disasters, which further aggravate the earthquake disaster situation. Therefore, it is necessary to study the dynamic and seismic characteristics of concrete-filled steel tubular tied arch bridge in order to deeply understand its dynamic characteristics and seismic response characteristics, and to provide a scientific basis for the seismic design and analysis of bridges. In this paper, the long-span through concrete filled steel tube tied arch bridge crossing Jinzhai Road in Hefei City is taken as the research object. The dynamic characteristics and seismic response of the bridge are calculated and analyzed by using the large-scale finite element software Midas/Civil. The main contents are as follows: 1. The development and characteristics of concrete-filled steel tubular (CFST) structures, the characteristics of tied arch bridges, the seismic analysis methods of bridge structures, the types of seismic damage of bridges and the present situation of seismic research of CFST arch bridges are introduced. 2. The basic concept of aseismic dynamics, the seismic fortification target, the ductile seismic design of bridges and the basic theory of performance-based seismic design of bridges are expounded. 3. The general situation of the bridge, the establishment of the finite element model, the static and dynamic characteristics of the bridge and the vibration characteristics of the bridge under various vibration modes are introduced. 4. The general situation, basic principle and application conditions of the response spectrum method are introduced. The response spectrum seismic response of the bridge under train load and no train load is analyzed, and the responses of the main arch rib, pier and tie beam of the bridge under earthquake action are obtained. 5. The general situation, basic principle and application conditions of dynamic time-history method are introduced. The dynamic time-history seismic response of the bridge is analyzed, and the main arch ribs and piers of the bridge are obtained. The internal forces and displacements of the girders under earthquake response and their variation law with time are calculated. The effects of high-speed train loads on the seismic response are calculated by comparing the train with and without trains. 6. The results of seismic response spectrum analysis and seismic dynamic time history analysis are compared, and the respective characteristics of the two methods are obtained. 7. This paper summarizes the whole paper, introduces some shortcomings in this paper and the direction to be studied in the future.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U442.55;U448.225

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