【正文】 ned with the stress feature of continuing steel bridge, changes in linear, reducing from the supports to the inter Main beam, the thick of the supports is and the inter Main beam is . Upon the basis of the section design, making an analysis of internal forces of the structure by MIDAS， evaluate the amounts of the reinforcement and arrange them accordingly, then check the capability of the main controlling section. Drawingthe structural construction plan, including the arrangement plan of the bridge span, the procedure of construction, etc. then translate them into English ,finally make the design illustration and Microsoft Word. Key words: prestressing concrete continuing steel bridge。 secondary internal forces 西南交通大學(xué)本科畢業(yè)設(shè)計 第 VIII 頁 目 錄 第一章 緒 論 ................................................................................................................................. 1 橋式方案的選擇 ................................................................................................................... 1 預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋概述 .............................................................................................. 1 受力特點 .............................................................................................................................. 2 構(gòu)造特點 .............................................................................................................................. 3 零號塊 ........................................................................................................................ 3 橫隔板 ........................................................................................................................ 3 合攏段 ........................................................................................................................ 3 畢業(yè)設(shè)計的目的和意義 ......................................................................................................... 4 畢業(yè) 設(shè)計的目的 ........................................................................................................... 4 畢業(yè)設(shè)計的意義 ........................................................................................................... 4 第二章 結(jié)構(gòu)初步設(shè)計 ................................................................................................................... 5 設(shè)計概述 .............................................................................................................................. 5 截面尺寸擬定 ....................................................................................................................... 5 變截面箱梁形式 .......................................................................................................... 5 主梁高度 .................................................................................................................... 6 頂?shù)装搴穸? ................................................................................................................. 6 腹板厚度 ..................................................................................................................... 7 梗腋（承托） .............................................................................................................. 7 主梁分段與施工節(jié)段劃分 ..................................................................................................... 8 懸臂施工節(jié)段劃分 ...................................................................................................... 8 施工階段劃分 ............................................................................................................. 9 施工注意事項 ........................................................................................................... 10 第三章 主梁內(nèi)力計算 ..................................................................................................................11 橋梁電算 .............................................................................................................................11 計算圖式 ...................................................................................................................11 施工階段設(shè)計 ........................................................................................................... 12 MIDAS/CIVIL2021 參數(shù)信息 ............................................................................................... 14 材料特性 ............................................................................................................. 14 荷載信息 .................................................................................................................. 15 恒載內(nèi)力計算 ...................................................................................................................... 16 西南交通大學(xué)本科畢業(yè)設(shè)計 第 IX 頁 毛截面幾何特性 ........................................................................................................ 16 恒載內(nèi)力計算 ........................................................................................................... 17 活載內(nèi)力計算 ...................................................................................................................... 20 橫向分布系數(shù)的考慮 .................................................................................................. 20 活載因子的計算 ......................................................................................................... 21 第四章 預(yù)應(yīng)力鋼束的估算與布置 ............................................................................................. 24 預(yù)應(yīng)力鋼束的估算 .............................................................................................................. 24 預(yù)應(yīng)力筋估束計算原理 ....................................................................................................... 24 按承載能力極限計算 .................................................................................................. 24 按正常使用極限狀態(tài)計算 .........................