【摘要】：隨著我國高速列車的開行,以及人們生活水平的不斷提高,減小列車通過橋梁時的振動以及噪聲對環(huán)境造成的污染,提高乘車舒適性,簡支鋼桁梁橋采用道碴橋面成為發(fā)展趨勢。但由于道碴橋面簡支鋼桁梁修建不多,且在設(shè)計方面尚存在許多技術(shù)問題需要研究解決。針對鐵路道碴橋面簡支梁的結(jié)構(gòu)和受力特點,開展鐵路道碴橋面簡支鋼桁梁的設(shè)計研究,先研究其簡化算法、空間結(jié)構(gòu)分析方法、疲勞計算理論和車-線-橋系統(tǒng)耦合作用等基本理論,研究了鐵路道碴橋面簡支梁橋結(jié)構(gòu)設(shè)計方法。以廣西沿海鐵路黎塘至欽州段擴能改造工程沙坪河大橋1-64m道碴橋面簡支鋼桁梁為依托工程,研究了道碴橋面鋼桁梁主桁凈空尺寸、主要構(gòu)件尺寸、主桁幾何圖式、結(jié)構(gòu)桿件材料、連接方式及橋面板設(shè)計,然后建立結(jié)構(gòu)計算模型,主要考慮設(shè)計荷載及組合,計算了各桿件的內(nèi)力、驗算了高強螺栓連接、結(jié)構(gòu)穩(wěn)定性計算和結(jié)構(gòu)疲勞驗算。通過研究工作取得以下成果及結(jié)論：(1)建立平面桁架結(jié)構(gòu)計算模型和空間梁單元結(jié)構(gòu)計算模型,分別進行鋼桁梁結(jié)構(gòu)內(nèi)力計算并進行了結(jié)果比較,發(fā)現(xiàn)二種計算方法間,不同桿件的誤差離散性較大。除端斜桿略小外,其余桿件采用平面桁架結(jié)構(gòu)計算模型計算出的軸力均比按空間梁單元結(jié)構(gòu)計算模型所得出的結(jié)果大,采用平面桁架結(jié)構(gòu)計算模型計算結(jié)果進行桿件相關(guān)驗算是偏于安全的。(2)總結(jié)出了疲勞驗算設(shè)計荷載組合方法,進而進行桿件疲勞驗算的方法和過程。(3)完成了廣西沿海鐵路黎塘至欽州段擴能改造工程沙坪河大橋1-64m道碴橋面簡支鋼桁梁主跨工程施工圖設(shè)計。(4)總結(jié)出鐵路道碴橋面簡支鋼桁梁橋設(shè)計的方法與步驟。
[Abstract]:With the running of high-speed train and the improvement of people's living standard, the environment pollution caused by the vibration and noise when the train passes through the bridge is reduced, and the ride comfort is improved. The adoption of ballast deck in simply supported steel truss bridges has become a trend of development. However, there are not many steel truss beams on the ballast deck, and there are still many technical problems to be solved in the design. In view of the structure and stress characteristics of simply supported girder on railway ballast deck, the design of simply supported steel truss beam on railway ballast deck is carried out. The simplified algorithm and the analysis method of spatial structure are studied first. Based on the fatigue calculation theory and the coupling theory of vehicle-line-bridge system, the structural design method of simply supported girder bridge on railway ballast deck is studied. Based on the construction of simply supported steel truss beam on 1-64m ballast deck of Shaping River Bridge, the dimensions of main truss clearance space, main component size and main truss geometry diagram of steel truss girder on ballast deck are studied. The structural material, connection mode and bridge deck are designed, and then the structural calculation model is established, which mainly considers the design load and combination, calculates the internal force of each member, checks and calculates the high strength bolt connection, the structural stability calculation and the structural fatigue checking calculation. The results and conclusions are as follows: (1) the calculation model of plane truss structure and space beam element structure are established, the internal forces of steel truss structure are calculated and compared with the results, and it is found that there are two calculation methods between them. The error dispersion of different members is larger. The axial forces calculated by the plane truss structure model are larger than those obtained from the spatial beam element structure model except for the slightly small end inclined bar. It is safe to use the calculation results of plane truss structure model to calculate the member correlation. (2) the design load combination method of fatigue checking calculation is summarized. Furthermore, the method and process of checking and calculating the fatigue of members are carried out. (3) the construction drawing design of the steel truss girder of the 1-64m ballast deck of Shapinghe Bridge is completed. (4) the construction drawing of railway ballast is summarized. Design method and procedure of simply supported steel truss bridge on deck.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U442.5

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本文編號：2207691