【正文】 J 0248,《公路鋼筋混凝土及預(yù)應(yīng)力混凝土橋涵設(shè)計規(guī)范》（簡稱《預(yù)規(guī)》）JTG D60—2004《公路橋涵設(shè)計通用規(guī)范》（簡稱《通用規(guī)范》）在本次設(shè)計過程中，新舊規(guī)范的交替，電腦制圖的操作，都使我的設(shè)計工作一度陷入僵局。本設(shè)計重點突出了預(yù)應(yīng)力在橋梁中的應(yīng)用，這也正體現(xiàn)了我國橋梁的發(fā)展趨勢。摘 要預(yù)應(yīng)力混凝土梁式橋在我國橋梁建筑上占我重要的地位，在目前，對于中小跨徑的永久性橋梁，無論是公路橋梁或者城市橋梁，都在盡量采用預(yù)應(yīng)力混凝土梁式橋，因為這種橋梁具有就地取材，工業(yè)化施工，耐久性好，適應(yīng)性強。關(guān)鍵詞：預(yù)應(yīng)力，簡支T梁，后張法，應(yīng)力驗算AbstractThe 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目 錄摘要…………………………………………………………………………………………… 1Abstract……………………………………………………………………………………… 2前言…………………………………………………………………………………………… 5第1章 橋型設(shè)計方案 ………………………………………………………………………6 ：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)計荷載 …………………………………………………………………… 6：鋼筋混凝土箱形拱橋……………………………………………………7………………………………………………………………………7………………………………………………………………………7…………………………………………………………8………………………………………………………………………8……………………………………………………………………………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 ……………………………………………………………………… 9 計資料及結(jié)構(gòu)布置 ……………………………………………………………… 9 ………………………………………………………………………9 ……………………………………………………………………9 ………………………………………………………… 12 ……………………………………………………………… 13 主梁作用效應(yīng)計算……………………………………………………………… 13 ……………………………………………………………… 13 ………………………………………………………… 15 ………………………………………………………… 25 …………………………………………………… 26 ……………………………………………… 26 …………………………………………………………… 27 計算主梁截面幾何特征………………………………………………………… 31 截面面積及慣矩計算……………………………………………………… 31 截面靜矩計算……………………………………………………………… 33 截面幾何特性匯總………………………………………………………… 34 預(yù)應(yīng)力損失計算………………………………………………………………… 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 、鋼束回縮引起的損失……………………………………… 37 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)力驗算……………………………………………………45 持久狀況承載能力極限狀態(tài)承載力驗算…………………………………45 持久狀態(tài)正常使用極限狀態(tài)抗裂驗算……………………………………48 持久狀態(tài)構(gòu)件的應(yīng)力驗算…………………………………………………49 短暫狀況構(gòu)件的應(yīng)力驗算…………………………………………………56 主梁端部的局部承壓驗算………………………………………………………56 局部承壓區(qū)的截面尺寸驗算………………………………………………56 局部抗壓承載力驗算………………………………………………………59 主梁變形驗算……………………………………………………………………59第3章 基礎(chǔ)的設(shè)計……………………………………………………………………… 62 蓋梁的計算………………………………………………………………………62 ……………………………………………………………………62 內(nèi)力計算…………………………………………………………………… 69 橋墩墩柱計算…………………………………………………………………… 70 荷載計算…………………………………………………………………… 70 截面配筋計算及應(yīng)力驗算………………………………………………… 72 鉆孔灌注樁計算………………………………………………………………… 74 …………………………………………………………………… 74 樁長計算…………………………………………………………………… 75結(jié)論………………………………………………………………………………………… 77致謝………………………………………………………………………………………… 78參考文獻…………………………………………………………………………………… 79前 言公路橋梁交通是為國民經(jīng)濟、社會發(fā)展和人民生活服務(wù)的公共基礎(chǔ)設(shè)施，是衡量一個國家經(jīng)濟實力和現(xiàn)代化水平的重要標(biāo)志。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)計得以順利完成。能有效控制投資規(guī)模，造價最省。,。這里取10cm。為了排除橋面積水，橋面設(shè)置預(yù)制混凝土集水井和φ10cm鑄鐵泄水管，布置在拱頂實腹區(qū)段。（2）預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋外型美觀，是目前公路大跨徑橋梁中經(jīng)常采用的橋型之一，尤其是墩身高度很高時,更能體現(xiàn)出它的優(yōu)勢。普通鋼筋直徑大于和等于12mm的采用HRB335鋼筋；直徑小于12mm的均用R235鋼筋。預(yù)置T梁的翼板厚度取用110mm，翼板跟部加厚到200mm以抵抗翼緣跟部較大的彎矩。簡支梁橋的頻率可采用下列公式估算： 其中： 根據(jù)本橋的基頻，可計算出汽車荷載的沖擊系數(shù)為： 按《橋規(guī)》，當(dāng)車道大于兩車道時，需進行車道折減，三車道折減22%，四車道折減33%，但折減后不得小于用兩行車隊布載的計算結(jié)果。 。通過每根鋼束長度計算，就可以得出一片主梁和一孔橋所需鋼束的總長度。 （2）在使用階段，換算截面的中和軸位置產(chǎn)生的最大剪力，應(yīng)該與張拉階段在換軸位置的剪應(yīng)力疊加。當(dāng)支點為計算截面時，；當(dāng)四分點為計算截面時；當(dāng)跨中為計算截面時。 持久狀況承載能力極限狀態(tài)承載力驗算在承載能力極限狀態(tài)下，預(yù)應(yīng)力混凝土梁沿正截面和斜截面都有可能破壞。 ②截面抗剪承載力驗算 驗算是否需要進行斜截面抗剪強度驗算。（2）預(yù)應(yīng)力筋拉應(yīng)力驗算 根據(jù)《公預(yù)規(guī)》，使用階段預(yù)應(yīng)力筋拉應(yīng)力應(yīng)符合下列要求： 式中：—預(yù)應(yīng)力筋扣除全部預(yù)應(yīng)力損失后的有效預(yù)應(yīng)力； —在作用標(biāo)準(zhǔn)效應(yīng)組合下受拉區(qū)預(yù)應(yīng)力筋產(chǎn)生的拉應(yīng)力，按下式計算： —分別為鋼束重心到截面凈軸和換軸的距離， —在作用標(biāo)準(zhǔn)效應(yīng)組合下預(yù)應(yīng)力筋重心處混凝土的法向拉應(yīng)力；應(yīng)力部分跨中上緣