本文選題：尼爾森體系 + 動力特性　； 參考：《蘭州交通大學》2017年碩士論文

【摘要】：目前,針對尼爾森體系系桿拱橋動力性能方面的研究主要集中在成橋階段,主要集中在動力特性與抗震性能方面。本文以鄭萬128m尼爾森體系系桿拱橋為背景,針對該橋梁施工周期長,而處于施工期的橋梁整體性不強、承載力較弱這一方面問題,具體探討了系桿拱橋施工階段動力特性與抗震性能。本文運用有限元軟件Midas Civil建立了鄭萬鐵路128m尼爾森體系系桿拱橋的有限元模型,運用反應(yīng)譜分析方法與時程分析方法,對大橋成橋階段的動力特性與抗震性能進行了分析,評述了該橋成橋狀態(tài)的抗震性能。其次,針對該橋技術(shù)含量高、建設(shè)周期長的特點,選用下承式系桿拱橋“先梁后拱”與“先拱后梁”兩種施工方法。分別進行了橋梁施工各個階段的具體劃分與建模,運用反應(yīng)譜分析方法與時程分析方法對處于施工期的鋼管混凝土系桿拱橋進行了地震相應(yīng)分析。主要得到了以下結(jié)論:(1)本文實例系桿拱橋的振動基頻為0.72Hz,對應(yīng)的振型為拱肋橫向?qū)ΨQ彎曲。這表明該橋結(jié)構(gòu)剛度較好。在三向震動輸入的情況下,每一方向震動輸入對應(yīng)橋梁結(jié)構(gòu)位移的主要方向。每一方向震動輸入,對橋梁結(jié)構(gòu)產(chǎn)生的內(nèi)力主要作用不同。在順橋向震動輸入情況下,拱頂?shù)淖畲髴?yīng)力值最大。在橫橋向震動輸入情況下,最大應(yīng)力值遠大于其它兩個方向震動輸入所引起的應(yīng)力值,拱上應(yīng)力由拱腳向拱頂遞減,系梁應(yīng)力由梁端向跨中增大。(2)對系桿拱橋按“先梁后拱”與“先拱后梁”施工方法進行了施工階段反應(yīng)譜分析與時程分析結(jié)果進行了比較分析,得到“先梁后拱”施工方法在抗震方面整體優(yōu)于“先拱后梁”施工方法。
[Abstract]:At present, the research on the dynamic performance of Nielsen system tied arch bridge is mainly focused on the stage of bridge completion, mainly on the dynamic characteristics and seismic performance. In this paper, taking Zhengwan 128m Nielsen system tied arch bridge as the background, aiming at the long construction period of the bridge, but the bridge in the construction period is not strong integrity, the bearing capacity is weak. The dynamic characteristics and seismic behavior of tied arch bridge during construction are discussed in detail. In this paper, the finite element model of the 128m Nielsen system tied arch bridge of Zhengwan railway is established by using the finite element software Midas Civil. The dynamic characteristics and seismic behavior of the bridge in the stage of completion are analyzed by using the response spectrum analysis method and the time-history analysis method. The seismic behavior of the bridge is reviewed. Secondly, according to the characteristics of the bridge with high technology content and long construction period, two construction methods, "first beam and then arch" and "first arch and then beam", are selected. The concrete division and modeling of each stage of bridge construction are carried out, and the seismic analysis of concrete-filled steel tubular tied arch bridge during construction period is carried out by using the response spectrum analysis method and time-history analysis method. The main conclusions are as follows: 1) in this paper, the fundamental frequency of vibration of tied arch bridge is 0.72 Hz, and the corresponding mode is transverse symmetrical bending of arch rib. This indicates that the stiffness of the bridge is better. In the case of three direction vibration input, each direction vibration input corresponds to the main direction of bridge structure displacement. The main effect of vibration input on bridge structure is different. The maximum stress value of the arch is maximum under the condition of the vibration input along the bridge. In the case of transverse bridge vibration input, the maximum stress value is much larger than the stress value caused by the other two directions vibration input, and the stress on the arch decreases from the arch foot to the arch top. The stress of tie beam is increased from the end of beam to the middle of span. (2) the results of response spectrum analysis and time history analysis of tied-arch bridge under the construction method of "first beam and then arch" and "first arch and then beam" are compared and analyzed. It is concluded that the construction method of "first beam and then arch" is better than that of "first arch and then beam" in earthquake resistance.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U441.3;U448.225

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