【正文】 structure stiffness, driving smooth and fortable, less expansion joints, easy maintenance, seismic ability, etc. And the tendons, increase tendons that can give full play to the characteristics of the high strength materials with reliable strength, stiffness and crack resistance, durability strong, material plasticity, facilitate architectural art processing, also easy to meet the requirements of the bridge curve and slope. When the bridge spans increases, the under load of continuous girder bridge for middle section of the node will bear larger in the negative moment, from absolute value perspective, the fulcrum in the negative moment far outweigh the cross CKS bending moment. The variable beam can be applied to the internal structure more distribution rule. Often the cantilever construction method, bee beam39。它具有變形小，結(jié)構(gòu)剛度好，行車(chē)平順舒適，伸縮縫少，養(yǎng)護(hù)簡(jiǎn)易，抗震能力強(qiáng)等優(yōu)點(diǎn)。 本設(shè)計(jì)包括 上部結(jié)構(gòu)布置、梁恒載內(nèi)力計(jì)算、主梁的活載內(nèi)力計(jì)算、確定鋼筋面積、預(yù)應(yīng)力損失計(jì)算、空心板短暫和持久狀態(tài)應(yīng)力驗(yàn)算 等。采用變截面梁（支點(diǎn)處梁高增大，跨中梁高減小 ，其間按曲線或折線過(guò)渡）更能適用結(jié)構(gòu)的內(nèi)力分布規(guī)律。而且采用了預(yù)應(yīng)力筋，增加預(yù)應(yīng)力筋能充分發(fā)揮高強(qiáng)材料的特性，具有可靠的強(qiáng)度、剛度和抗裂性能，耐久性強(qiáng)，材料可塑性強(qiáng)，便于建筑藝術(shù)處理，也容易滿(mǎn)足橋梁曲線和坡度的要求。 摘 要 本次設(shè)計(jì)橋梁類(lèi)型為預(yù)應(yīng)力混凝土連續(xù)梁橋， 預(yù)應(yīng)力混凝土連續(xù)梁是現(xiàn)在廣泛使用的一種體系，主要適用于大跨度梁橋。它具有變形小，結(jié)構(gòu)剛度好，行車(chē)平順舒適，伸縮縫少，養(yǎng)護(hù)簡(jiǎn)易，抗震能力強(qiáng)等優(yōu)點(diǎn)。當(dāng)橋跨增大時(shí)，在荷載作用下，連續(xù)梁橋的中間節(jié)點(diǎn)截面處將承受較大的負(fù)彎矩，從絕對(duì)值來(lái)看，支點(diǎn)負(fù)彎矩遠(yuǎn)大于跨中正彎矩。常采用懸臂法施工，變截面梁的受力狀態(tài)與其施工時(shí)的內(nèi)力狀態(tài)基本吻合，更適用于大跨度預(yù)應(yīng)力混凝土連續(xù)梁橋，其外形和諧，節(jié)省材料并可增大橋下凈空，是大跨度橋梁的優(yōu)選方案。本設(shè)計(jì)題目為：三跨預(yù)應(yīng)力混凝土空心板型連續(xù)梁橋。而且采用了預(yù)應(yīng)力筋，增加預(yù)應(yīng)力筋能充分發(fā)揮高 強(qiáng)材料的特性，具有可靠的強(qiáng)度、剛度和抗裂性能，耐久性強(qiáng)，材料可塑性強(qiáng)，便于建筑藝術(shù)處理，也容易滿(mǎn)足橋梁曲線和坡度的要求。s stress state and its construction of internal force of the state results, more suitable to the large span prestressed concrete continuous girder bridge, its appearance is harmonious, save material and can increase the obstacle clearance under the bridge, is the large span bridge optimization. This design include the upper structure load live load internal force of main girder intral force calculation calculate and determine the reinforcement area of prestress calculation hollow slab is short and persistent state chechking, design topic for: three cross Pres tressed concrete continuous bridge variable crosssection of the box. It has little deformation, structure stiffness, driving smooth and fortable, less expansion joints, easy maintenance, seismic ability, etc. And the tendons, increase tendons that can give full play to the characteristics of the high strength materials with reliable strength, stiffness and crack resistance, durability strong, material plasticity, facilitate architectural art processing, also easy to meetthe requirements of the bridge curve and slope. KEY WORDS: prestress,internal force calculation,checking and construction 目 錄 前言 ?????????????????????????????????? 1 1 設(shè)計(jì)資料 ??????????????????????????? ?? 3 主要技術(shù)指標(biāo) ? ???????????????????? ?????? 3 材料規(guī)格 ???????????? ?????????? ????? 3 采用的技術(shù)規(guī)范 ???????????????????? ????? 3 2 構(gòu)造形式及尺寸選定 ?????????????????? ??????? 5 3 空心板毛截面幾何特性計(jì)算 ????????????? ???????? 7 邊跨空心板毛截面幾何特性計(jì)算 ????????????? ????? 7 中跨空心板毛截面幾何特性計(jì)算 ????????????? ????? 8 4 作用效應(yīng)計(jì)算 ?????????????????????? ?? ?? ?? 9 永久作用效應(yīng)計(jì)算 ??????????????????? ?????? 9 可變作用效應(yīng)計(jì)算 ??????????????????? ?????? 9 作用效應(yīng)組合匯總 ??????????????????? ????? 14 5 預(yù)應(yīng)力鋼筋數(shù)量估算及布置 ???????????????? ?????? 17 預(yù)應(yīng)力鋼筋數(shù)量的估算 ????????????????? ????? 17 預(yù)應(yīng)力鋼筋的布置 ??????????????????? ????? 18 普通鋼筋數(shù) 量的估算及布置 ?????????????? ????? 18 6 換算截面幾何特性計(jì)算 ??????????????????? ????? 21 換算截面面積 A0 ???????????????????? ???? 21 換算截面重心的位置 ????????????????? ????? 21 換算截面慣性矩 I0 ??????????????????? ????? 22 換算截面的彈性抵抗矩 ?????????????????? ???? 22 7 承載能力極限狀態(tài)計(jì)算 ????????? ?????????? ????? 23 跨中截面正截面抗彎承載力計(jì)算 ????????????? ???? 23 斜截面抗彎承載力計(jì)算 ?????????????????? ???? 23 8 預(yù)應(yīng)力損失計(jì)算 ?????????????????????? ?????? 29 錨具變形、回縮引起的應(yīng)力損失 ???????????? ????? 29 鋼筋與臺(tái)座間的溫差引起的應(yīng)力損失 ????? ????????? ?? 29 混凝土彈性壓縮引起的預(yù)應(yīng)力損失 ????? ????? ??????? 29 預(yù)應(yīng)力鋼絞線由于應(yīng)力松弛引起的預(yù)應(yīng)力損失 ?????? ?????? 29 混凝土的收縮和徐變引起的應(yīng)力損失 ?????????? ????? 30 預(yù)應(yīng)力損失組合 ????????????????????? ??? 31 9 正常使用極限狀態(tài)計(jì)算 ??????????????????? ????? 33 正截面抗裂性驗(yàn)算 ??????????????????? ????? 33 斜截面抗裂性驗(yàn)算 ??????????????????? ????? 36 10 變形計(jì)算 ???????????????????????? ????? 41 正常使用階段的撓度計(jì)算 ???????????????? ????? 41 預(yù)加力引起的反拱度計(jì)算及預(yù)拱度的設(shè)置 ????????? ????? 41 11 持久狀態(tài)應(yīng)力驗(yàn)算 ????????????????????? ????? 45 跨中截面混凝土的法向壓應(yīng)力驗(yàn)算 ?????????? ????? 45 跨中預(yù)應(yīng)力鋼絞線的拉應(yīng)力驗(yàn)算 ???????????? ????? 45 斜截面主應(yīng)力驗(yàn)算 ??????????????????? ??? 45 12 短暫狀態(tài)應(yīng)力驗(yàn)算 ????????????????????? ????? 49 跨中截面 ?????????????????????????? 49 L/4 截面 ???????????????????????????? 50 支點(diǎn)截面 ?????????????????????? ?????? 51 13 最小配筋率復(fù)核 ????????????????????? ????? 53 14 鉸縫計(jì)算 ????????? ??????????????? ????? 55 鉸縫剪力計(jì)算 ????????????????????? ????? 55 鉸縫抗剪強(qiáng)度驗(yàn)算 ???????????????????????? 56 15 預(yù)制空心板吊杯計(jì)算 ??????????????????? ?????? 57 16 支座計(jì)算 ???????????????????????? ????? 59 選定支座的平面尺寸 ?????????????????? ???? 59 確定支座的厚度 ???????????? ??????? ????? 59 驗(yàn)算支座的偏轉(zhuǎn) ??????????????????? ????? 60 驗(yàn)算支座的穩(wěn)定性 ? ??????????????????? ??? 61 17 下部結(jié)構(gòu)計(jì)算 ????????????????????? ?????? 63 蓋梁計(jì)算 ????????????????????? ??????? 63 橋墩墩柱設(shè)計(jì) ??????????????????? ?????? 76 鉆孔柱的設(shè)計(jì) ????????????????????? ?????? 80 結(jié)論 ?????????????????????????????????? 87 致謝 ?????????????????????????? ?????? 89 參考文獻(xiàn) ?????????????????????????? ????? 91 附錄 ?????????????????????????????????? 93 1 前 言 本次設(shè)計(jì) 內(nèi)容為預(yù)應(yīng)力空心板橋，眾所周知， 隨著我國(guó)社會(huì)的發(fā)展與進(jìn)步和人民的生活水平的日益提高，交通的便利程度和安全性得到了人們的廣泛關(guān)注，橋梁又是現(xiàn)代交通中不可缺少的組成部分，于此同時(shí)，橋梁建設(shè)得到了迅猛發(fā)展，我國(guó)橋梁工程無(wú)論在建設(shè)規(guī)模上，還是在科技水平上，均已躋身世界先進(jìn)行列。 本設(shè)計(jì)是根據(jù)《公路橋涵設(shè)計(jì)手冊(cè)》系列叢書(shū)，以及依照交通部頒發(fā)的有關(guān)公路橋涵設(shè)計(jì)規(guī)范（ JTG 系列）擬