本文選題：地震　切入點：大跨徑鋼混組合拱橋　出處：《重慶交通大學》2014年碩士論文

【摘要】：鋼-混組合結(jié)構(gòu)已經(jīng)在大跨度斜拉橋、拱橋、連續(xù)剛構(gòu)橋中得到廣泛應(yīng)用,取得了良好的力學效果。隨著拱橋跨度的增大,拱圈自重顯著增加,這已成為制約拱橋朝更大跨度發(fā)展的重要因素。為此,本文以重慶萬州長江大橋420m拱橋為原型,探索性地提出了拱腳區(qū)段為混凝土拱箱、拱頂區(qū)段為鋼箱的一種新型大跨鋼-混組合拱橋,達到減輕自重的目的。由于拱圈由兩種不同材料組成,截面剛度存在較大差異,因此有必要開展結(jié)構(gòu)動力特性、抗震性能及其鋼-混分界點位置影響研究： ①采用大型有限元分析軟件SAP2000進行結(jié)構(gòu)動力特性計算,分析鋼-混組合拱橋的動力特性,探討前500階振型對結(jié)構(gòu)抗震性能的影響程度。 ②由于主拱圈由鋼和混凝土兩種不同材料構(gòu)成,采用試算方法討論分界點位置對結(jié)構(gòu)模態(tài)的影響。 ③選用EL-Centro地震波以及Taft地震波進行結(jié)構(gòu)非線性時程分析,研究單個方向激勵以及多個方向耦合激勵對鋼-混組合拱橋非線性時程分析的適用性�；诜蔷�性時程分析計算結(jié)果,討論鋼和混凝土在拱圈上的分界點問題。 ④將EL-Centro和Taft地震波以位移波的形式輸入,通過在兩個拱腳間設(shè)置多種時間相位差,從位移和內(nèi)力兩個方面探討行波效應(yīng)對鋼-混組合拱橋的影響規(guī)律。 ⑤針對分析結(jié)果,指出鋼-混組合拱橋的抗震薄弱環(huán)節(jié),提出幾種初步改進措施,并從橋梁抗震角度展望這種新型鋼混組合拱橋在實際工程中的應(yīng)用前景。
[Abstract]:Steel-concrete composite structures have been widely used in long-span cable-stayed bridges, arch bridges and continuous rigid frame bridges. This has become an important factor restricting the arch bridge to the development of a larger span. Therefore, this paper takes the 420m arch bridge of Wanzhou Yangtze River Bridge in Chongqing as the prototype, and puts forward that the arch foot section is concrete arch box. The section of arch roof is a new type of large-span steel-hybrid composite arch bridge with steel box, which can reduce the deadweight. Because the arch ring is composed of two different materials and the section stiffness is quite different, it is necessary to develop the dynamic characteristics of the structure. Study on Seismic performance and location of Steel-concrete Boundary Point:. The main contents are as follows: 1. The dynamic characteristics of steel-concrete composite arch bridge are calculated by using the large-scale finite element analysis software SAP2000, and the influence of the first 500th vibration modes on the seismic behavior of the structure is discussed. (2) because the main arch ring is composed of two different materials, steel and concrete, the influence of the location of the boundary point on the structural mode is discussed by the method of trial calculation. (3) EL-Centro and Taft seismic waves are used for nonlinear time-history analysis of structures. The applicability of single directional excitation and multi-directional coupled excitation to nonlinear time-history analysis of steel-concrete composite arch bridge is studied. The results of nonlinear time-history analysis are based on the results of nonlinear time-history analysis. The boundary point of steel and concrete on arch ring is discussed. (4) the EL-Centro and Taft seismic waves are input in the form of displacement waves. By setting a variety of time phase differences between the two arches, the influence of traveling wave effect on steel-concrete composite arch bridge is discussed from two aspects of displacement and internal force. 5. In view of the analysis results, the paper points out the weak link of the steel-concrete composite arch bridge, puts forward some preliminary improvement measures, and looks forward to the application prospect of the new steel-concrete composite arch bridge in the practical engineering from the angle of the bridge seismic resistance.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U442.55;U448.22

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