本文選題：獨(dú)塔斜拉橋 + 異形橋塔　； 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：橋塔作為斜拉橋的標(biāo)志,其構(gòu)造多種多樣,異形橋塔也越來越多,而異形橋塔的受力較常規(guī)橋塔復(fù)雜,導(dǎo)致其計(jì)算分析相對困難。論文以雅安大興二橋獨(dú)塔斜拉橋初步設(shè)計(jì)方案為依托,初步設(shè)計(jì)跨徑布置為50m+188m+122m+48m,橋塔采用多橫梁梭形形式。通過建立全橋空間梁單元有限元模型,對全橋進(jìn)行靜力、穩(wěn)定性及抗震分析和設(shè)計(jì)優(yōu)化,再借助主梁節(jié)段實(shí)體單元模型,對其橫橋向受力進(jìn)行計(jì)算分析。論文首先介紹獨(dú)塔斜拉橋相關(guān)的應(yīng)用背景、設(shè)計(jì)理論和發(fā)展前景,然后總結(jié)該類異形橋塔獨(dú)塔斜拉橋的建模相關(guān)事項(xiàng)。利用該有限元模型,分別計(jì)算分析結(jié)構(gòu)在施工階段、成橋運(yùn)營階段的應(yīng)力、變形與穩(wěn)定性,得出在施工、運(yùn)營過程中橋例結(jié)構(gòu)安全可靠,施工階段結(jié)構(gòu)穩(wěn)定性逐漸降低。通過分析混凝土?xí)r變效應(yīng)對結(jié)構(gòu)應(yīng)力的影響,得到其影響對橋例結(jié)構(gòu)不可忽略。采用反應(yīng)譜分析法和時(shí)程分析法對全橋結(jié)構(gòu)在地震作用下的承載能力進(jìn)行計(jì)算得到橋塔底部結(jié)構(gòu)抗震能力不足。針對這一問題,通過計(jì)算分析在主梁和橋墩之間設(shè)置阻尼器情況下的橋塔底部結(jié)構(gòu)內(nèi)力和塔頂位移,得出合理設(shè)置阻尼器使塔底結(jié)構(gòu)彎矩、剪力和塔頂位移均減小20%左右,使作用于結(jié)構(gòu)的地震作用明顯降低。運(yùn)用有限元軟件ANSYS建立橋例主梁節(jié)段的實(shí)體單元模型,通過分別計(jì)算分析改變橫隔板預(yù)應(yīng)力鋼束的錨固位置和橫隔板厚度得到錨固位置變化對主梁結(jié)構(gòu)主拉應(yīng)力的影響較大。將橫隔板預(yù)應(yīng)力鋼束錨固在靠近箱梁底板位置的方式能降低主梁的主拉應(yīng)力。
[Abstract]:As the symbol of cable-stayed bridge, the structure of the tower is varied and the special-shaped tower is more and more. The stress of the special-shaped tower is more complicated than that of the conventional bridge tower, which leads to the difficulty of calculation and analysis.Based on the preliminary design scheme of Ya'an Daxing second Bridge single tower cable-stayed bridge, the preliminary design span is 50m 188m 122m 48m, and the bridge tower adopts multi-beam spindle form.By establishing the finite element model of the space beam of the whole bridge, the static, stability, seismic analysis and design optimization of the whole bridge are carried out, and then the transverse force of the bridge is calculated and analyzed with the help of the solid element model of the main girder segment.This paper first introduces the application background, design theory and development prospect of single tower cable-stayed bridge, and then summarizes the related matters of modeling of this kind of special-shaped cable-stayed bridge with single tower.Using the finite element model, the stress, deformation and stability of the structure in the construction stage and the operation stage of the bridge are calculated and analyzed respectively. It is concluded that the bridge example structure is safe and reliable in the construction and operation process, and the structural stability decreases gradually in the construction stage.By analyzing the influence of time-varying effect of concrete on structural stress, it is concluded that the influence of time-varying effect of concrete can not be ignored.The response spectrum analysis and time history analysis are used to calculate the bearing capacity of the whole bridge structure under earthquake action. The results show that the seismic capacity of the bottom structure of the bridge tower is insufficient.In order to solve this problem, through the calculation and analysis of the internal force and the top displacement of the bottom structure of the bridge tower under the condition of installing dampers between the main beam and the pier, it is concluded that the reasonable installation of the damper can reduce the bending moment, shear force and displacement of the tower top by about 20%.The seismic action acting on the structure is obviously reduced.The finite element software ANSYS is used to establish the solid element model of the main girder segment of the bridge. The influence of the change of the anchoring position and the thickness of the transverse partition plate on the main tensile stress of the main girder structure is obtained by calculating and analyzing respectively the anchoring position of the prestressed steel bundle and the thickness of the transverse partition plate.The main tensile stress of the main beam can be reduced by anchoring the prestressed steel bundle near the bottom plate of the box girder.
【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】：2015
【分類號】：U448.27

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本文編號：1755209