本文關(guān)鍵詞：大跨鐵路連續(xù)剛構(gòu)橋等效風(fēng)荷載研究　出處：《西南交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 連續(xù)剛構(gòu)橋 等效風(fēng)荷載 懸臂施工狀態(tài) LRC方法 規(guī)范方法 簡化計算公式

【摘要】：大跨度連續(xù)剛構(gòu)橋在成橋階段剛度較大,具有較好的抗風(fēng)性能,而由于其施工方法的特點,在施工階段的最大懸臂狀態(tài)下,其剛度較小,自然風(fēng)會誘發(fā)結(jié)構(gòu)的抖振響應(yīng),過大的結(jié)構(gòu)響應(yīng)會影響橋梁結(jié)構(gòu)的施工及安全,這個階段往往會成為連續(xù)剛構(gòu)橋抗風(fēng)性能的最不利狀態(tài)。因此最大懸臂狀態(tài)的風(fēng)荷載計算就成為了橋梁設(shè)計的需要考慮的關(guān)鍵因素之一。等效風(fēng)荷載在橋梁抗風(fēng)領(lǐng)域的研究相對較少,而對連續(xù)剛構(gòu)橋最大懸臂狀態(tài)下的等效風(fēng)荷載研究更是少之又少,本論文擬以既有的等效風(fēng)荷載理論為基礎(chǔ),以烏龍江大橋及北東口水道特大橋為研究對象,對最大懸臂狀態(tài)下的連續(xù)剛構(gòu)橋等效風(fēng)荷載進(jìn)行研究。本文對連續(xù)剛構(gòu)橋等效風(fēng)荷載簡化計算方法的研究主要有以下主要步驟：首先利用有限元軟件ANSYS對研究對象在不同施工工況下的進(jìn)行動力特性分析；其次利用節(jié)段模型風(fēng)洞試驗及數(shù)值計算的方法得到主梁典型斷面及橋墩的靜力系數(shù)；然后將等效風(fēng)荷載分成平均風(fēng)荷載、背景風(fēng)荷載、慣性風(fēng)荷載三部分,不同結(jié)構(gòu)響應(yīng)(懸臂端部位移、懸臂根部彎矩、橋墩墩底扭矩等)對應(yīng)結(jié)構(gòu)不同的影響函數(shù)及振型函數(shù),依此對主梁及橋墩相應(yīng)的等效風(fēng)荷載簡化計算方法進(jìn)行研究,以期得到適用于工程應(yīng)用的簡化計算公式,并利用得到的簡化計算公式對研究對象在最大雙臂狀態(tài)下的各響應(yīng)進(jìn)行計算；最后為驗證簡化計算公式的正確性,將簡化計算結(jié)果同荷載--響應(yīng)相關(guān)法計算結(jié)果(LRC)、規(guī)范方法加慣性風(fēng)荷載計算結(jié)果相比較,進(jìn)行誤差分析,以得到簡化計算公式的適用范圍及精確程度。
[Abstract]:The stiffness of long-span continuous rigid frame bridge in the stage of completion is large and has good wind resistance. However, due to the characteristics of its construction method, the stiffness of the long-span continuous rigid frame bridge is smaller under the maximum cantilever state in the construction stage. The natural wind will induce the buffeting response of the structure, and the excessive structural response will affect the construction and safety of the bridge structure. The wind load calculation of the maximum cantilever state is one of the key factors to be considered in bridge design. There is relatively little research in the field. The research on the equivalent wind load of continuous rigid frame bridge under the maximum cantilever state is very rare. This paper is based on the existing equivalent wind load theory and takes the Wulong River Bridge and the Beidongkou Waterway Bridge as the research object. The equivalent wind load of continuous rigid frame bridge under the maximum cantilever state is studied. In this paper, the simplified calculation method of equivalent wind load of continuous rigid frame bridge is studied as follows:. Firstly, the finite element software ANSYS is used to analyze the dynamic characteristics of the research object under different construction conditions. Secondly, the static coefficients of typical sections and piers of the main beam are obtained by using the method of wind tunnel test and numerical calculation of segmental model. Then the equivalent wind load is divided into three parts: average wind load, background wind load and inertial wind load, and different structural responses (cantilever tip displacement, cantilever root bending moment). According to the different influence function and mode function of the bridge pier, the simplified equivalent wind load calculation method for the main beam and pier is studied. In order to obtain the simplified calculation formula suitable for engineering application, and use the simplified calculation formula to calculate the responses of the research object under the maximum two-arm state; Finally, in order to verify the correctness of the simplified calculation formula, the simplified calculation results are compared with the results of the load-response correlation method and the code method plus the inertial wind load calculation results, and the error analysis is carried out. The range of application and the degree of accuracy of the simplified formula are obtained.
【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】：2014
【分類號】：U448.23;U441.2

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本文編號：1431992