【摘要】：摘要：鋼主梁斜拉橋常用的主梁形式有鋼箱梁和鋼桁梁,將兩者相結(jié)合不僅保證了主梁整體剛度,而且施工作業(yè)方便、施工進(jìn)度較快。鐵路斜拉橋因所受荷載大、結(jié)構(gòu)輕柔,車橋耦合振動問題較為突出,對剛度的要求較高。而剛度參數(shù)的確定是斜拉橋設(shè)計(jì)的重要部分,對這種新型主梁形式斜拉橋尤為重要。本文工作依托國家自然科學(xué)基金項(xiàng)目“強(qiáng)風(fēng)環(huán)境下高速鐵路車-橋系統(tǒng)氣動特性和抗傾覆性能風(fēng)洞試驗(yàn)研究(51178471)”,結(jié)合洞庭湖三塔鋼箱-鋼桁疊合梁斜拉橋工程實(shí)例,主要完成內(nèi)容和結(jié)論如下： (1)針對三塔鋼箱-鋼桁疊合梁斜拉橋的結(jié)構(gòu)特點(diǎn),建立了車橋系統(tǒng)動力學(xué)仿真分析與精細(xì)化計(jì)算模型,利用該模型進(jìn)行動力特性計(jì)算與分析,結(jié)果表明橋梁基頻為橫向振動模態(tài),振型較為密集,且模態(tài)呈現(xiàn)出較強(qiáng)的耦合性。 (2)利用上述精細(xì)化分析模型對洞庭湖三塔鋼箱-鋼桁疊合梁斜拉橋原設(shè)計(jì)方案進(jìn)行車橋系統(tǒng)動力學(xué)仿真計(jì)算與研究,結(jié)果表明：當(dāng)列車以設(shè)計(jì)速度過橋時具有足夠的安全性和舒適性。 (3)研究了不同桁寬、桁高、穩(wěn)定索剛度、中塔剛度和二期恒載等剛度敏感參數(shù)對洞庭湖三塔鋼箱-鋼桁疊合梁斜拉橋的自振特性及車橋動力響應(yīng)的變化規(guī)律,分析結(jié)果表明：鋼箱-鋼桁疊合梁桁寬的增加能夠顯著增大橋梁橫向基頻,且能減小跨中橫向振動響應(yīng)；增大鋼箱-鋼桁疊合梁桁高、提高中塔剛度和穩(wěn)定索剛度均能顯著減小橋梁跨中豎向振動位移；二期恒載的變化對橋梁的橫、豎向剛度的影響規(guī)律不明顯。
[Abstract]:Abstract: The main beam of the main girder of the steel girder cable-stayed bridge has the steel box girder and the steel beam, and the combination of the two is not only the overall rigidity of the main beam, but also the construction operation is convenient and the construction progress is fast. The railway cable-stayed bridge has the advantages of large load, soft structure, and high coupling vibration of the axle, and the requirement for rigidity is high. The determination of the stiffness parameter is an important part of the design of the cable-stayed bridge. Based on the project "Wind tunnel test study on aerodynamic characteristics and anti-overturning performance of high-speed railway vehicle-bridge system under strong wind environment (51178471)" of the National Natural Science Foundation of China, the main contents and conclusions of the project are as follows: (1) For the structure of the three-tower steel box-steel corrugated composite beam cable-stayed bridge The results show that the fundamental frequency of the bridge is the transverse vibration mode, the vibration mode is relatively dense, and the modal presents a strong coupling. (2) Using the above-mentioned fine analysis model to calculate and study the dynamic simulation of the axle system for the original design scheme of the three-tower steel box-steel double-beam cable-stayed bridge of the Dongting Lake, the results show that when the train passes through the bridge with the design speed, it has sufficient safety and safety. The natural vibration and dynamic response of the cable-stayed bridge of the three-tower steel box-steel-reinforced composite beam-stayed bridge of Dongting Lake were studied by using the stiffness-sensitive parameters such as wide-width, high-strength, stable cable stiffness, middle tower stiffness and second-phase constant load. The results show that the increase of the width of the steel box-steel composite beam can significantly increase the transverse fundamental frequency of the bridge and reduce the lateral vibration response of the bridge. the influence of the change of the second phase and the second phase on the transverse and vertical stiffness of the bridge
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.3;U448.27

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