【正文】 ions,the pretrssed concrete continuous beam bridge is chosen to the ultimate. The continuous prestressed concrete girder bridge is divided into three inters,(90m+150m+90m),with the man span of 150m,and 90msymmetry one,the width of the deck is railing+3 roadway+ railing,Prestressed concrete box girder is used as the main beam depth in the midspan is at the support bearing it is 9m. the sectional depth is changed in the form of parabolic. the former varies from to , and the latter varies from to which changed at the L/6 and L/3 (L is the length of the main span), the top slab’s thickness keeps along the whole bridge constant, for . and the design load is for the highwayⅠ . In the design,the bridge design software Midas is used in designing and simuiating the bridge stucture(mainly the upper stucture) by applying cantilever hungbasket bearing and symmetric equilibrium construction. At the same time, By analyzing and puting the dead load, live load and internal force, the estimated value of the prestressed strand is got, then improve the model to , Analyze the structure with the Midas software in a variety of load binations,and pare the result with the sdandara requirement, Check calculation is carried out to the stress and deformation of the main beam to determine the design loads of the design is adequate and reasonable security,Thus, get a plete result of the analysis and checking calculation show that the design calculation method is correct. And the internal force distribution is reasonabal to the design task. key words bridge desige prestressed concrete box girder nonuniform continuous beam Midas bridge model cantilever hungbasket bearingxx 大學(xué)本科 畢業(yè)設(shè)計(jì) 第 VI 頁(yè) 目 錄 第 1 章 緒論 ............................................................ 1 預(yù)應(yīng)力混凝土連續(xù)梁橋概述 ............................................ 1 預(yù)應(yīng)力混凝土連續(xù)梁橋發(fā)展 ..................................... 1 設(shè)計(jì)特征 ..................................................... 2 受力特點(diǎn) ..................................................... 3 構(gòu)造特點(diǎn) ..................................................... 4 連續(xù)梁的主要優(yōu)點(diǎn) ............................................. 5 工程概況及基本資料 ................................................. 6 工程概況 ..................................................... 6 主要技術(shù)指標(biāo) ................................................. 6 主要材料 ..................................................... 7 設(shè)計(jì)依據(jù)與基本資料 ........................................... 7 方案比選 ..................................................... 7 第 2 章 橋梁總體布置及結(jié)構(gòu)主要尺寸 ..................................... 11 橋梁總體規(guī)劃布置 .................................................. 11 孔跨分布 .................................................... 11 梁部截面形式比選 ............................................ 11 結(jié)構(gòu)主要尺寸 ....................................................... 13 梁高的擬定 ................................................... 13 底板、頂板的擬定 ............................................. 14 腹板的擬定 ................................................... 14 第 3 章 橋梁結(jié)構(gòu)內(nèi)力計(jì)算 ............................................... 16 MIDAS 軟件簡(jiǎn)介 ..................................................... 16 MIDAS 建模步驟簡(jiǎn)說(shuō) ................................................. 16 靜力荷載內(nèi)力計(jì)算 .................................................. 17 xx 大學(xué)本科 畢業(yè)設(shè)計(jì) 第 VII 頁(yè) 計(jì)算原理 ................................................... 17 靜力荷載計(jì)算 ................................................ 18 靜力荷載內(nèi)力計(jì)算 ........................................... 20 移動(dòng)荷載內(nèi)力計(jì)算 ................................................... 23 第 4 章 橋梁配筋計(jì)算 ................................................... 24 預(yù)應(yīng)力筋束的布置原則 ............................................... 24 預(yù)應(yīng)力配束優(yōu)化設(shè)計(jì) ................................................ 25 預(yù)應(yīng)力筋數(shù)量估算 .................................................. 25 承載能力極限狀態(tài)的應(yīng)力要求 .................................. 26 正常使用極限狀態(tài)的應(yīng)力要求 .................................. 27 預(yù)應(yīng)力鋼束的估算 ............................................ 31 預(yù)應(yīng)力損失計(jì)算 .................................................... 32 預(yù)加力引起的二次內(nèi)力 .............................................. 34 有效應(yīng)力的計(jì)算 .................................................... 35 第 5 章 截面驗(yàn)算 ....................................................... 36 各施工階段內(nèi)力及應(yīng)力圖 ............................................ 36 各施工階段及二期應(yīng)力圖 ...................................... 36 各中極限狀態(tài)下的彎矩、應(yīng)力包絡(luò)圖 ............................ 52 強(qiáng)度驗(yàn)算 .......................................................... 55 施工階段階段的結(jié)構(gòu)驗(yàn)算 ............................................ 57 施工階段截面法向壓應(yīng)力驗(yàn)算 .................................. 57 受拉區(qū)鋼筋的拉應(yīng)力驗(yàn)算 ...................................... 58 使用階段截面抗裂驗(yàn)算 ........................................ 59 變形驗(yàn)算 .......................................................... 61 xx 大學(xué)本科 畢業(yè)設(shè)計(jì) 第 VIII 頁(yè) 第 6 章 施工步驟與主要工程量 ........................................... 62 施工 步驟 .......................................................... 62 懸臂澆筑施工法 .............................................. 62 施工步驟 .................................................... 63 混凝土總用量 ...................................................... 65 梁體混凝土用量 .............................................. 65 橋面鋪裝混凝土用量計(jì)算 ...................................... 67 鋼絞線及錨具總用量 ................................................ 67 頂板束預(yù)應(yīng)力材料統(tǒng)計(jì) ........................................ 67 腹板束預(yù)應(yīng)力材料統(tǒng)計(jì) ........................................ 69 底板束預(yù)應(yīng)力材料統(tǒng)計(jì) ........................................ 70 結(jié) 論 ................................................................ 71 致 謝 ................................................................. 72 參考文獻(xiàn) .............................................................. 73 xx 大學(xué)本科 畢業(yè)設(shè)計(jì) 第 1 頁(yè)