【正文】 投入費(fèi)用要高；且由于增加了大噸位支座，日后維護(hù)費(fèi)用要增加。 總結(jié) 預(yù)應(yīng)力混凝土連續(xù)箱梁也是目前 公路大跨徑橋梁中經(jīng)常采用的橋型之一。 施工方法 采用無支架纜索吊裝施工方法，拱箱分段預(yù)制。為了排除橋面積水，橋面設(shè)置預(yù)制混凝土集水井和φ 10cm 鑄鐵泄水管，布置在拱頂實(shí)腹區(qū)段。 橋面鋪裝及縱橫坡度 橋面采用瀝青混凝土橋面鋪裝，厚 。橫隔板應(yīng)預(yù)留人行孔，以便于維修養(yǎng)護(hù)。 3 28m 裝配式預(yù)應(yīng)力簡支 T 梁 8 （ 6）現(xiàn)澆頂部混凝土厚度：一般不小于 10cm，這里取 10cm。這里取 10cm。 （ 4）底板厚度： 6～ 14cm。 （ 2）拱壁厚度：預(yù)制 箱壁厚度主要受震搗條件限制，按箱壁鋼筋保護(hù)層和插入式震動棒的要求，一般需有 10cm，若采用附著式震搗器分段震搗，可減少為 8cm,取 8cm。 拱箱尺寸擬定如圖 888168108132 161241688108108208468201021208圖 （ 1）拱箱寬度：由構(gòu)件強(qiáng)度、剛度和起吊能力等因素決定，一般為 130～ 160cm。橋面行車道寬 ,兩邊各設(shè) 的人行道。橋墩為重力式橋墩，橋臺為 U型橋臺。全橋分八跨，每跨均采用 標(biāo)準(zhǔn)跨徑 60m。 材料及工藝 本橋?yàn)轭A(yù)應(yīng)力鋼筋混凝土 T型梁橋，錐形錨具； 山東交通學(xué)院畢業(yè)設(shè)計(jì)（論文） 7 混凝土：主梁采用 50 號混凝土，橋面鋪裝用 30號混凝土； 預(yù)應(yīng)力鋼筋：采用《公路鋼筋混凝土及預(yù)應(yīng)力混凝土橋涵設(shè)計(jì)規(guī)范》（ JTG D62—2021）的ф 鋼絞線，每束 6 根，全梁配 6 束， pkf =1860MPa。能有效控制投資規(guī)模，造價最省。橋型能適應(yīng)橋位環(huán)境，施工工藝成熟、安全可靠；采用簡支轉(zhuǎn)連續(xù)橋型，橋面連續(xù)，行車舒適，施工方便，工期較短。 1).上部構(gòu)造為預(yù)應(yīng)力混凝土 T型梁，梁高 m；下部構(gòu)造為柱式墩身，肋板式 橋臺，樁基礎(chǔ)；采用簡支轉(zhuǎn)連續(xù)施工。 由于公路橋梁工程技術(shù)的不斷進(jìn)步，技術(shù)標(biāo)準(zhǔn)的不斷更新，加之本人能力所限，設(shè)計(jì)過程中的錯誤和不足再所難免，敬請各位老師給予批評指正。在指導(dǎo)老師王老師及本組其他組員的幫助下，才使的這次設(shè)計(jì)得以順利完成。下部結(jié)構(gòu)采用以鉆孔灌注樁為基礎(chǔ)的墩柱，并分別對橋墩和樁基礎(chǔ)進(jìn)行了計(jì)算和驗(yàn)算。 在設(shè)計(jì)中，橋梁上部結(jié)構(gòu)的計(jì)算著重分析 了橋梁在施工及使用過程中恒載以及活載的作用力，采用整體的自重荷載集度進(jìn)行恒載內(nèi)力的計(jì)算。 本設(shè)計(jì)是根據(jù)設(shè)計(jì)任務(wù)書的要求和《公路橋規(guī)》的規(guī)定，選定裝配式預(yù)應(yīng)力 T形截面簡支梁橋，該類型的梁橋具有受力均勻、穩(wěn)定，且對于小跨徑單跨不產(chǎn)生負(fù)彎矩，施工簡單且進(jìn)度迅速等優(yōu)點(diǎn)。 關(guān)鍵詞 ：預(yù)應(yīng)力，簡支 T梁，后張法，應(yīng)力驗(yàn)算 3 28m 裝配式預(yù)應(yīng)力簡支 T 梁 2 Abstract The prestressed concrete beam plate bridge occupies my important status in our country bridge construction, in at present, regarding small span permanent bridge, regardless of is the highway bridge or the city bridge, all as far as possible is using the prestressed concrete beam plate bridge, because this kind of bridge has makes use of local materials, the industrialization construction, the durability is good, patible, integrity good as well as artistic and so on many kinds of merits. This design uses assembly type simple support T beam structure, its superstructure by the king post, septum transversum beam, the lane board, the bridge floor part and the support and so on is posed, the obvious king post is the bridge main carrier. Its king post connects into the whole through the crossbeam and the lane board, enable the vehicles load to have the good traverse between various king posts .Bridge floor part including positions and so on flooring, expansion and contraction installment and parapet, these structures although is not the bridge main carrier, but their design and the construction relates the bridge whole directly the function and the security, here has also given the detailed explanation in this design. This design mainly steps the sagging moment control, when the span increases, cross the bending moment which produces by the dead load and the live load the sharp growth, is the material intensity majority of consumes for the structure gravity, thus limits the spanning ability, this design uses the 27m standard span, has solved this problem reasonably. In the design through the king post endogenic force putation, the stress steel bar arrangement, king post section intensity and stress checking calculation, lane board and support, pillar Taiwan and so on designs, a structure assembly type prestressed concrete simple support T beam bridge, the checking calculation pletely has conformed to the requirement perfectly, uses the method and the new standard corresponds. This design has highlighted the prestressed with emphasis in the bridge application, this has also been manifesting our country bridge trend of development. Key word: Prestressed， Simple support T beam， Tensioning， Stress checking calculation 山東交通學(xué)院畢業(yè)設(shè)計(jì)（論文） 3 目 錄 摘要 ??????????????????????????????????? 1 Abstract????????????????????????????????? 2 前言 ??????????????????????????????????? 5 第 1章 橋型設(shè)計(jì)方案 ??????????????????????????? 6 方案一：預(yù)應(yīng)力鋼筋混凝土 簡支梁（錐型錨具） ???????????? 6 基本構(gòu)造布置 ???????????????????????? 6 設(shè)計(jì)荷載 ?????????????????????????? 6 方案二：鋼筋混凝土箱形拱橋 ???????????????????? 7 方案簡介 ??????????????????????????? 7 尺寸擬定 ??????????????????????????? 7 橋面鋪裝及縱橫坡度 ??????????? ??????????? 8 施工方法 ??????????????????????????? 8 總結(jié) ????????????????????????????? 8 橋型方案三：預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)方案（比較方案） ?????????? 8 第 2 章 上部結(jié)構(gòu)設(shè)計(jì) ?? ????????????????????????? 9 計(jì)資料及結(jié)構(gòu)布置 ??????????????????????? ? 9 設(shè)計(jì)資料 ????????????????????????? ?? 9 橫截面布置 ?????????????????????????? 9 橫截面沿跨長變化 ?????????????????????? 12 橫隔梁的布置 ???????????????????????? 13 主梁作用效應(yīng)計(jì)算 ???????????????????????? 13 永久效應(yīng)計(jì)算 ???????????????????????? 13 可變作用效應(yīng)計(jì)算 ???? ?????????????????? 15 主梁作用效應(yīng)組合 ?????????????????????? 25 預(yù)應(yīng)力鋼束的估算及其位置 ???????????????????? 26 跨中截面鋼束的估算和確定 ?????????????????? 26 預(yù)應(yīng)力鋼束布置 ??????????????????????? 27 計(jì)算主梁截面幾何特征 ?????????????????????? 31 截面面積及慣矩計(jì)算 ????????????????????? 31 截面靜矩計(jì)算 ???????????????????????? 33 截面幾何特性匯總 ?????????????????????? 34 預(yù)應(yīng)力損失計(jì)算 ????????????????????????? 34 預(yù)應(yīng)力鋼束與管道壁之間的摩擦引起的預(yù)應(yīng)力損失 ???????? 37 由錨具變形、鋼束回縮引起的損失 ???????? ??????? 37 3 28m 裝配式預(yù)應(yīng)力簡支 T 梁 4 混凝土彈性收縮引起的預(yù)應(yīng)力損失 ?????????????? 38 由鋼束應(yīng)力松弛引起的損失 ?????????????????? 39 混凝土收縮和徐變引起的損失 ????????????????? 41 預(yù)加力計(jì)算及鋼束預(yù)應(yīng)力損失匯總 ??????????????? 42 主梁截面承載力與應(yīng)力驗(yàn)算 ???????????????????? 45 持久狀 況承載能力極限狀態(tài)承載力驗(yàn)算 ????????????? 45 持久狀態(tài)正常使用極限狀態(tài)抗裂驗(yàn)算 ?????????????? 48 持久狀態(tài)構(gòu)件的應(yīng)力驗(yàn)算 ??????????????????? 49 短暫狀況構(gòu)件的應(yīng)力驗(yàn)算 ??????????????????? 56 主梁端部的局部承壓驗(yàn)算 ????????????????????? 56 局部承壓區(qū)的截面尺寸驗(yàn)算 ?????????????????? 56 局部抗壓承載力驗(yàn)算 ????????????????????? 59 主梁變形驗(yàn)算 ?????????????????????????? 59 第 3 章 基礎(chǔ)的設(shè)計(jì) ??????????????????????????? 62 蓋梁的計(jì)算 ??????????????????????????? 62 荷載計(jì)算 ?????????????????????????? 62 內(nèi)力計(jì)算 ??????????????????????? ??? 69