【正文】 finite element model that is reasonable and simple, analyzing the structure behavior of the girder body under loading, especially the internal forces of bridge structure under dead load, live load and additional force. According to the internal force bination, the evaluated amount of longitudinal tendons can be worked out, and also prestressed steel bar is arranged. Moreover, the model takes the structural secondary internal forces caused by temperature, the foundation uneven subsidence, the prestress, and the creep and shrinkage of concrete into consideration. Prestress is analyzed by taking the prestressed steel bar of for example. Thirdly, this design expounds the stress effect under some important bination of the internal force bination. Checking calculations of structure design, including the calculations of deformation and strength in the construction stage and service stage, are done carefully according to standard. Lastly, this article also calculates the approximated amount of work when building the 西南交通大學(xué)本科 畢業(yè)設(shè)計 第 V頁 girder body. Key words: highspeed railway。 structure design。 Beam Bridge 西南交通大學(xué)本科 畢業(yè)設(shè)計 第 VI 頁 目錄 第 1 章 緒論 .......................................................................................................................... 1 京滬高速鐵路概述 .................................................................................................. 1 連續(xù)梁的發(fā)展 .......................................................................................................... 1 連續(xù)梁橋的分類 ...................................................................................................... 2 預(yù)應(yīng)力混凝土連續(xù)梁橋的力學(xué)特點(diǎn)和適用范圍 .................................................. 2 第 2 章 設(shè)計依據(jù)以及設(shè)計基本資料 ................................................................................. 4 設(shè)計采用規(guī)范 .......................................................................................................... 4 設(shè)計基本情況 .......................................................................................................... 4 設(shè)計所用材料及特性值 .......................................................................................... 4 設(shè)計荷載 .................................................................................................................. 5 第 3 章 橋梁方案以及結(jié)構(gòu)主要尺寸 ................................................................................. 7 方案簡介 .................................................................................................................. 7 橋跨總體布置 ................................................................................................. 7 施工方法 ......................................................................................................... 7 施工節(jié)段的劃分 ............................................................................................. 7 結(jié)構(gòu)主要尺寸擬定 .................................................................................................. 8 主、邊跨徑的擬定 ......................................................................................... 8 順橋向尺寸的擬定 ......................................................................................... 9 橫橋向尺寸的擬定 ......................................................................................... 9 第 4 章 梁體內(nèi)力計算 ....................................................................................................... 13 結(jié)構(gòu)計算簡圖及其模擬 ........................................................................................ 13 模型建立原則 ............................................................................................... 13 結(jié)構(gòu)模型 ....................................................................................................... 13 恒載內(nèi)力計算 ........................................................................................................ 16 施工階段恒載內(nèi)力計算結(jié)果 ....................................................................... 17 成橋階段內(nèi)力計算結(jié)果 ............................................................................... 20 西南交通大學(xué)本科 畢業(yè)設(shè)計 第 VII 頁 活載內(nèi)力計算 ........................................................................................................ 22 活載內(nèi)力計算方法 ....................................................................................... 22 沖擊系數(shù) 的計算 ........................................................................................... 23 移動荷載內(nèi)力計算結(jié)果 ............................................................................... 23 附加力產(chǎn)生的附加內(nèi)力計算 ................................................................................ 25 風(fēng)荷載內(nèi)力計算 ........................................................................................... 25 制動力產(chǎn)生的內(nèi)力計算 ............................................................................... 27 溫度及支座沉降次內(nèi)力計算 ................................................................................ 29 溫度次內(nèi)力計算 ........................................................................................... 29 基礎(chǔ)不均勻沉降引起的次內(nèi)力 ................................................................... 33 內(nèi)力組合（一） .................................................................................................... 34 第 5 章 預(yù)應(yīng)力筋的配置 ................................................................................................... 37 預(yù)應(yīng)力筋布置原則 ................................................................................................ 37 預(yù)應(yīng)力筋的估配計算原理 .................................................................................... 38 預(yù)應(yīng)力筋的實際布置 ............................................................................................ 39 縱向預(yù)應(yīng)力筋的布置 ................................................................................... 40 橫、豎向預(yù)應(yīng)力筋的布置 ...........................................................