【正文】 摘 要本設(shè)計(jì)為寧鄉(xiāng)大橋主橋上部結(jié)構(gòu)設(shè)計(jì)。該橋全長 340m，設(shè)計(jì)的跨徑為60m+2*110m+60m，截面為單箱單室的變截面形式。整個(gè)設(shè)計(jì)可以分成兩個(gè)部分：第一部分，結(jié)構(gòu)建摸和內(nèi)力計(jì)算。在選擇橋的橋型及孔徑劃分、主梁截面形式與主梁高度的擬定、截面細(xì)部尺寸擬定，隨后進(jìn)行結(jié)構(gòu)內(nèi)力計(jì)算。在完成了恒載內(nèi)力的計(jì)算后，又進(jìn)行了活載內(nèi)力計(jì)算、次內(nèi)力計(jì)算、內(nèi)力組合計(jì)算，并畫出內(nèi)力包絡(luò)圖。第二部分，預(yù)應(yīng)力鋼束估算及布置，預(yù)應(yīng)力損失及有效預(yù)應(yīng)力計(jì)算，鋼束布置后的內(nèi)力計(jì)算及組合，強(qiáng)度計(jì)算與驗(yàn)算，應(yīng)力、應(yīng)變及其它驗(yàn)算。關(guān)鍵詞：預(yù)應(yīng)力連續(xù)箱梁；建立模型；內(nèi)力計(jì)算；強(qiáng)度驗(yàn)算The Superstructure Design of mache BridgeAbstractThe design is the one of the superstructure of jiujiang bridge. The whole span of the bridge is 340m. This bridge designs the span is 60m+2*110m+60m,The cross section along the span is the different besides the cross section is one box with one room. The entire design may divide into two parts：The first part of the paper is about the modeling of the bridge and the putation of internal forces. The FEM model of the bridge is established after the style of the bridge, the length of every span the cross section and the height of the main beam are decided. Then every kind of internal forces is puted. These forces include the forces of dead load, live load and some secondary forces. Finally these loads are bined and the graph of the utmost forces is second one is about the arrangement of prestressed steel bars and other kinds of tests. The number of the bars are estimated and arranged before the loss of the prestress and the effective one are caculated. Then the tests of the strength, the stress and the deformation of the bridge are carried out in the paper.Key words: prestressed concrete continuous bridge；establishment model。 Endogenic force putation intensity checking calculation.目錄目 錄 ...................................................................................................................1前 言 ...................................................................................................................3第一章 工程概述 ..................................................................................................4 工程概況 .......................................................................................................4 設(shè)計(jì)條件 .......................................................................................................4 工程地質(zhì)和地震 ................................................................................................4 氣象和水文 .........................................................................................................4 設(shè)計(jì)標(biāo)準(zhǔn)和設(shè)計(jì)規(guī)范及建筑材料 ...............................................................4 設(shè)計(jì)規(guī)范 ..............................................................................................................4 主要技術(shù)標(biāo)準(zhǔn) .....................................................................................................4 主要建筑材料 .....................................................................................................5 橋型總體布置 ...............................................................................................6 橋跨布置 ..............................................................................................................6 橋梁構(gòu)造 .......................................................................................................6第二章 主橋結(jié)構(gòu)計(jì)算分析 ................................................................................7 計(jì)算模型和施工階段劃分 ...........................................................................7 懸臂節(jié)段劃分及單元?jiǎng)澐?...........................................................................7 主要計(jì)算荷載如下 .......................................................................................8第三章 恒載內(nèi)力計(jì)算及變形分析 ..................................................................9 毛截面特性計(jì)算 ...........................................................................................9 恒載集度計(jì)算 .............................................................................................11 一期恒載集度 ..................................................................................................11 二期恒載集度 ..................................................................................................12 時(shí)程內(nèi)力計(jì)算 .............................................................................................12 梁段懸臂施工內(nèi)力 .........................................................................................12 邊跨梁體合攏內(nèi)力 .........................................................................................14 中跨梁體合攏內(nèi)力 .........................................................................................17 恒載內(nèi)力結(jié)果 .............................................................................................20 一期恒載內(nèi)力 ..................................................................................................20 二期恒載內(nèi)力 ..................................................................................................22 總恒載內(nèi)力 .......................................................................................................27第四章 活載內(nèi)力計(jì)算及內(nèi)力組合 .........................................................30 汽車和人群活載內(nèi)力計(jì)算 .........................................................................30 溫度次內(nèi)力計(jì)算 .........................................................................................34 支座沉降次內(nèi)力計(jì)算 .................................................................................37 荷載組合及內(nèi)力包絡(luò)圖 .............................................................................38 組合方法 ............................................................................................................38 計(jì)算結(jié)果 ............................................................................................................40 內(nèi)力包絡(luò)圖 .......................................................................................................56第五章 預(yù)應(yīng)力鋼束估算與布置 ..........................................................................58 鋼束估算 .....................................................................................................58 估算原理 .......................................