【正文】 由于橋墩承擔(dān)一部分的彎矩，剛構(gòu)橋的截面控制彎距相對(duì)減小，同時(shí)由于采用平衡懸臂施工方法，使橋梁?jiǎn)慰缈鐝酱蟠笤龃蟆?近年來，隨著預(yù)應(yīng)力混凝土技術(shù)的發(fā)展和懸臂施工方法的廣泛應(yīng)用，連續(xù)剛構(gòu)橋得到了進(jìn)一步的發(fā)展。 本設(shè)計(jì)為 82＋ 154+82m 公路預(yù) 應(yīng)力混凝土連續(xù)剛構(gòu)橋設(shè)計(jì) ，主要針對(duì)已經(jīng)給出的大跨度連續(xù)剛構(gòu)橋的上部結(jié)構(gòu)設(shè)計(jì)，由于時(shí)間有限，本設(shè)計(jì)主要針對(duì)上部結(jié)構(gòu)，也就是主梁和橋面的設(shè)計(jì)。 本設(shè)計(jì)主要采用 MIDAS 分析軟件來進(jìn)行結(jié)構(gòu)內(nèi)力分析計(jì)算，期間也用了 Autocad 和 Excel進(jìn)行輔助設(shè)計(jì)。全橋上部結(jié)構(gòu)共分為 92 個(gè)梁?jiǎn)卧?，定義有 23 個(gè)施工階段，先進(jìn)行邊跨合 龍 ，再進(jìn)行中跨合 龍 。 建好計(jì)算模型后，對(duì)結(jié)構(gòu)進(jìn)行內(nèi)力分析計(jì)算，然后對(duì) 預(yù)應(yīng)力 鋼筋數(shù)量進(jìn)行估計(jì)并配置鋼筋，進(jìn)行預(yù)應(yīng)力損失和各項(xiàng)次內(nèi)力計(jì)算，然后再進(jìn)行荷載組合并檢算主要控制截面的承載能力和變形情況，最后估 算出全橋的主要工程量。在做完所有計(jì)算后，繪制結(jié)構(gòu)主要施工圖，包括橋跨布置圖、施工順序圖等，進(jìn)行外文翻譯，最后編制設(shè)計(jì)計(jì)算說明書和文檔整理。 關(guān)鍵詞： 預(yù)應(yīng)力混凝土 ， 剛構(gòu)橋 ， 懸臂 澆筑 施工 ，設(shè)計(jì) 西南交通大學(xué)本科 畢業(yè)設(shè)計(jì) (論文 ) 第 V 頁 Abstract Compared with other type of beam bridges, the continuous rigid frame bridge has the advantages such as small dimensions, great clearance, less consumption of concrete, good structural stiffness, etc. As pared with the same span of continuous beam bridge, the control section’s bending moment of rigid frame bridge can be minimized to obviously smaller level, and it is more easily to apply the balanced cantilever construction techniques, or longer individual span could be gotten. In recent years, with the development of the prestressed concrete technology and the wide use of the cantilever construction method, continuous rigid frame bridge has gotten further developed. The design here is that of an (82m＋ 154m+82m) spans of prestressed concrete continuous rigid frame bridge. It is intended for the superstructure design of the longspan continuous rigid frame bridge which has been given. Since time is limited， the design puts emphasis just on the top structure， that is to say， the main beam and the bridge floor. This design mostly uses MIDAS to calculate the internal force, also used AutoCAD and Excel foraided during the design. The entire bridge is discretized in 92beam elements, the construction process is simulated with 23 construction stages, the side spans are closed at first, and then the middle span. After the pletion of the calculation model, analysis of the internal force of the structure, the amount of the steel bar is estimated and the collocation is done. After these processes, prestressing loss and the redundant internal forces are calculated, and then load bination, the bearing capability of beam’s main controlling section are checked. At last, the main quantities of the fullbridge are estimated. After all of the calculation, the construction drawings (including bridge span arrangement, construction procedure and so on), the translation of a foreign language article are pleted. And the introduction of the design’s text is made at last. Keywords: prestressed concrete, rigid frame bridge, cantilever construction, design 西南交通大學(xué)本科 畢業(yè)設(shè)計(jì) (論文 ) 第 VI 頁 目 錄 第 1 章 緒論 ......................................................... 1 畢業(yè)設(shè)計(jì)的目的和意義 ............................................. 1 連續(xù)剛構(gòu) 橋回顧與展望 ............................................ 1 連續(xù)剛構(gòu)橋的基本構(gòu)造特點(diǎn) ........................................ 3 橋梁跨徑 ................................................... 4 箱梁根部底板厚度 ........................................... 4 箱梁頂板厚度 ............................................... 4 主梁高度 ................................................... 4 連續(xù)梁橋懸臂施工方法介紹 ........................................ 5 施工特點(diǎn) ................................................... 5 托架與掛籃 ................................................. 5 工藝流程 ................................................... 6 第 2 章 橋跨總體布置及結(jié)構(gòu)主要尺寸 ..................................... 7 橋型布置及孔徑劃分 .............................................. 7 截面形式及截面尺寸擬定 .......................................... 7 截面形式 ................................................... 7 立面形式 .................................................... 7 主梁高度 .................................................... 7 箱梁底板厚度設(shè)置 ........................................... 8 腹板厚度設(shè)置 ............................................... 8 橫隔板 ..................................................... 8 主梁分段與施工階段的劃分 ......................................... 9 主梁分段 .................................................... 9 具體分段 ................................................... 9 主梁施工方法及注意事項(xiàng) .................................... 10 施工階段的劃分 ............................................ 11 第 3 章 荷載內(nèi)力計(jì)算 .................................................. 14 MIDAS 軟件簡(jiǎn)介 .................................................. 14 基本參數(shù) ....................................................... 15 計(jì)算方法 .................................................. 15 材料信息 .................................................. 15 荷載信息 .................................................. 16 恒載計(jì)算 ........................................................ 17 毛截面幾何特性 ............................................. 17 施工荷載 ................................................... 18 二期恒載 .................................................. 18 計(jì)算模型 .................................................. 18 西南交通大學(xué)本科 畢業(yè)設(shè)計(jì) (論文 ) 第 VII 頁 恒載計(jì)算結(jié)果 .............................................. 19 活載內(nèi)力計(jì)算 ................................................... 21 計(jì)算方法 .................................................. 21 活載計(jì)算結(jié)果 .............................................. 22 第 4 章 預(yù)應(yīng)力鋼束設(shè)計(jì) ................................................ 24 估算預(yù)應(yīng)力鋼束 ................................................ 24 計(jì)算原理 ................................................... 24 預(yù)應(yīng)力鋼束的估計(jì) ......................................... 27 預(yù)應(yīng)力鋼束的布置 ......................................... 29 預(yù)應(yīng)力損失計(jì)算 ................................................ 31 預(yù)應(yīng)力鋼筋與管道之間摩擦引起的應(yīng)力損失 ................... 31