【正文】 《公路橋涵設計通用規(guī)范》（ JTG D60—2020） [3]里規(guī)定，公路 Ⅱ 級車道荷載的均布荷載標準值為 qk==。 計算各塊板的荷載橫向分布系數(shù) 在影響線上橫向按最不利位置布置荷載后，就可以通過相應影響線值求得各板的荷載橫向分布系數(shù) cm 。 由此得空心板的每延米一期恒載 g? 及二期恒載 g? ： 1 2 317. 28 / , 4 8 2 /g g k N m g g g k N m??? ? ? ? ? ? ?。 表 11 邊板截面各分塊幾何特性 分塊號 Ai(cm2) Yi(cm) Si(cm3) Ii39。 材料：空心板為 40 號混凝土；鉸縫為 30 號細骨料混凝土；橋面鋪裝采用30 號瀝青混凝土；橋面連續(xù)采用 30 號混 凝土；欄桿及人行道板為 25 號混凝土；橋面鋪裝 8cm防水混凝土， 9cm瀝青混凝土。此空心板挖空率較大，自重 較輕，它的技術較先進，制作工藝成熟，施工方便，制造簡單。此河處于市郊，區(qū) 域內無不良地質現(xiàn)象，屬于穩(wěn)定性河段，抗震有利地段，在此河上建造一經(jīng)濟合理，適用性強的橋梁，來滿足兩岸經(jīng)濟的發(fā)展，方便人們的生活需要。s life needs. This project not only includes the hydrological calculation, calculation of internal force of main girder, prestressed arrangement, calculation of the prestressing loss,stress calculation, calculation bearing,designing support abutment,beam and pier and foundation calculation, but also includes rendering detailed three plan’s flat and elevation ang profile graph, main beam profile,main beam of prestressed steel bar,capping beam of steel, pier of steel,abutment construction graph, pile of steel, bearing structure and the telescopic device graph. The hollow rate of this hollow slab is larger hence and it is much lighter .It possesses advanced technology, mature fabrication process, convenient construction and simple manufacture The safe and reliable quality of the structure has its merits ,such as good durability, easy small teel consumption, convenient installation, short construction period, low cost and so on,taking all those factors into account that it is suitable for Liu Hao River This project meet the economical and beautiful buildings of advanced technological, safety and reliability, applicability and durability. Keywords: prestressed hollow slab bridge, beam, abutment, pile cap, pie I 目 錄 摘 要 ....................................................................................................................... I Abstract ......................................................................................................................... II 第 1 章 初步設計 .......................................................................................................1 設計資料 .......................................................................................................1 構造型式及尺寸選定及截面特性 ...............................................................1 第 2 章 作用效應計算 ...............................................................................................4 永久作用計算 ...............................................................................................4 可變荷載（活載）產(chǎn)生的內力 ...................................................................5 內力組合 .....................................................................................................14 第 3 章 預應力鋼筋面積的估算及布置 .................................................................18 估算預應力鋼筋面積 .................................................................................18 預應力鋼束布置 .........................................................................................23 第 4 章 換 算截面幾何特性計算 .............................................................................25 換算截面面積 .............................................................................................25 換算截面重心位置 .....................................................................................25 換算截面慣矩 .............................................................................................26 截面抗彎模量 .............................................................................................26 第 5 章 空心板強度計算 .........................................................................................27 正截面強度計算 .........................................................................................27 箍筋計算 .....................................................................................................29 第 6 章 預應力損失 .................................................................................................33 錨具變形、鋼筋回縮引起的應力損失 2l? ...............................................33 加熱養(yǎng)護引起的損失 3l? ............................................................................33 混凝土彈性壓縮引起的應力損失 4l? .......................................................33 預應力鋼筋松弛引起的損失 5l? .............................................................34 混凝土收縮徐變引起的應力損失 6l? .......................................................35 永存預應力值 .............................................................................................37 第 7 章 應力驗算 .....................................................................................................38 短暫狀態(tài)應力驗算 .....................................................................................38 持久狀態(tài)應力驗算 .....................................................................................39 第 8 章 變形計算 .....................................................................................................43 II 使用階段撓度計算 .....................................................................................43 預加力引起的反拱計 算及預拱度的設置 .................................................44 第 9 章 鉸縫的抗剪強度驗算 .................................................................................46 鉸縫剪力影響線 .........................................................................................46 作用在鉸縫上的荷載計算及驗 算 .............................................................47 第 10 章 支座計算 ...................................................................................................50 確定支座平面尺寸 ...................................................................................50 確定支座厚度 ...........................................................................................50 支座偏轉驗算 ....................................................................