本文選題：混合梁斜拉橋　切入點(diǎn)：地震響應(yīng)　出處：《西南交通大學(xué)》2017年碩士論文

【摘要】：論文以主跨跨徑為530m的某大跨度混合梁斜拉橋?yàn)檠芯繉ο?其主跨主梁為鋼混疊合梁。運(yùn)用有限元方法建立了該橋的全橋空間有限元模型,研究分析了大跨度斜拉橋結(jié)構(gòu)的動(dòng)力特性以及地震響應(yīng)特征,主要包括以下幾點(diǎn)內(nèi)容:(1)簡述了混合梁斜拉橋的特點(diǎn)和發(fā)展過程,并介紹了一些常見的橋梁震害特點(diǎn)及原因;(2)論述了三種常用的橋梁地震反應(yīng)分析方法,包括靜力法、反應(yīng)譜法以及動(dòng)態(tài)時(shí)程分析方法,并討論了各自的適用范圍和優(yōu)缺點(diǎn);(3)詳述了該斜拉橋空間有限元模型的建立過程,計(jì)算了該大跨度斜拉橋的有樁基礎(chǔ)模型和無樁基礎(chǔ)模型的自振頻率和振型,對比分析了樁-土-結(jié)構(gòu)相互作用對結(jié)構(gòu)自振特性的影響;(4)運(yùn)用時(shí)程分析方法計(jì)算了該大跨度斜拉橋有樁基礎(chǔ)模型和無樁基礎(chǔ)模型的地震響應(yīng),通過對比分析研究了樁-土-結(jié)構(gòu)相互作用對大跨度斜拉橋地震響應(yīng)的影響規(guī)律;(5)運(yùn)用多點(diǎn)激勵(lì)的方法研究了行波效應(yīng)對大跨度斜拉橋地震相應(yīng)的影響規(guī)律,與一致激勵(lì)的結(jié)果進(jìn)行對比,比較兩者差異,并且研究了5種地震波波速工況下的主塔塔頂和主梁梁端縱向位移、塔底內(nèi)力的變化規(guī)律;(6)運(yùn)用非線性時(shí)程分析方法,研究了縱向粘滯阻尼器不同的參數(shù)組合對于該大跨度斜拉橋的地震響應(yīng)的影響規(guī)律和減震效果,并對阻尼器的阻尼系數(shù)和阻尼指數(shù)進(jìn)行優(yōu)化,提出了一組適合該斜拉橋的粘滯阻尼器參數(shù)。
[Abstract]:In this paper, a large span cable-stayed bridge with 530m span is studied, and the main span of the bridge is steel-concrete composite beam. The spatial finite element model of the bridge is established by using finite element method. The dynamic characteristics and seismic response characteristics of long-span cable-stayed bridge structures are studied and analyzed. The main contents are as follows: 1) the characteristics and development process of hybrid cable-stayed bridges are briefly described. This paper also introduces some common characteristics and causes of bridge earthquake damage, and discusses three commonly used bridge seismic response analysis methods, including static method, response spectrum method and dynamic time-history analysis method. The establishment process of the spatial finite element model of the cable-stayed bridge is discussed in detail, and the natural frequencies and modes of the pile-foundation model and the pile-free foundation model of the long-span cable-stayed bridge are calculated. The influence of pile-soil-structure interaction on the natural vibration characteristics of the structure is analyzed. (4) the seismic responses of the long-span cable-stayed bridge model with and without pile foundation are calculated by using time-history analysis method. The effect of pile-soil-structure interaction on the seismic response of long-span cable-stayed bridges is studied by means of comparative analysis. (5) the effect of traveling wave effect on the seismic response of long-span cable-stayed bridges is studied by using the method of multi-point excitation. Compared with the results of consistent excitation, the difference between them is compared, and the longitudinal displacement of the top of the main tower and the beam end of the main girder under five seismic wave velocities are studied. The variation law of the internal forces at the bottom of the tower is studied by means of nonlinear time-history analysis method. The effects of different parameter combinations of longitudinal viscous dampers on the seismic response of the long-span cable-stayed bridge are studied, and the damping coefficient and damping index of the dampers are optimized. A set of viscous damper parameters suitable for the cable-stayed bridge is proposed.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U448.27;U442.55

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本文編號：1670539