橋梁工程畢業(yè)設計

1、摘 要在本設計中，根據(jù)參考圖紙的要求，依據(jù)現(xiàn)行鐵路橋梁設計規(guī)范提出了預應力混凝土連續(xù)梁橋、預應力混凝土連續(xù)剛構、簡支梁橋三種橋型方案。按照“實用、經(jīng)濟、安全、美觀”的橋梁設計原則，經(jīng)過對各種橋型的比選最終選擇 48m+80m+48m 的預應力混凝土連續(xù)梁橋為本次的推薦設計橋型。 本設計利用 Midas 軟件進行結(jié)構分析，根據(jù)橋梁的尺寸擬定建立橋梁基本模型，然后進行內(nèi)力分析，計算配筋結(jié)果，進行施工各階段分析及截面驗算。同時，必須要考

2、慮混凝土收縮、徐變次內(nèi)力和溫度次內(nèi)力等因素的影響。本設計主要是預應力混凝土連續(xù)梁橋的上部結(jié)構設計，設計中主要進行了橋梁總體布置及結(jié)構尺寸擬定、橋梁荷載內(nèi)力計算、橋梁預應力鋼束的估算與布置、橋梁預應力損失及應力的驗算、次內(nèi)力的驗算、內(nèi)力組合驗算、主梁截面應力驗算。最后，經(jīng)過分析驗算表明該設計計算方法正確，內(nèi)力分布合理，符合設計任務的要求。關鍵字：連續(xù)梁橋；連續(xù)剛構；簡支梁橋；結(jié)構分析；驗算AbstractIn this design, a

3、ccording to the referencing drawings requirements，according to the current Railway bridge design specification of prestressed concrete continuous girder bridge forward, Prestressed concrete continuous rigid-frame structu

4、re, simple supported girder bridge. According to the “practical, beautiful, safe, economic and convenient for construction of bridge design principles, structure after the bridge of various final choice of 48m + 80 + 48m

5、 prestressed concrete continuous girder bridge design for this recommendation.This design using the Midas software analysis the structure，according to the size of the bridge, the basic model establishment bridge worked，t

6、hen force analysis，calculation 1. 概述...........................................................................................................................................................41. 1 預應力混凝土連續(xù)梁橋概述...........

7、..............................................................................................41. 2 技術標準....................................................................................................................

8、.....................51. 3 橋址處自然條件.............................................................................................................................61. 4 采用材料...................................................

9、......................................................................................71. 5 設計規(guī)范及標準.........................................................................................................................

10、....82. 方案比選...................................................................................................................................................82. 1 構思宗旨...................................................

11、.......................................................................................82. 2 比選標準...........................................................................................................................

12、..............82. 3 設計方案.........................................................................................................................................82.3.1 設計方案一: 變截面預應力混凝土連續(xù)梁橋 ...............................

13、..................................82.3.2 設計方案二：預應力混凝土連續(xù)剛構橋 .......................................................................102.3.3 設計方案三：預應力混凝土簡支梁橋 .................................................................

14、..........112. 4 方案比選結(jié)果...............................................................................................................................123. 截面尺寸擬定和主梁施工階段的劃分.................................................

15、................................................133.1 設計特點及受力特點....................................................................................................................133.1.1 設計特點.............................

16、..............................................................................................133.1.2 受力特點..................................................................................................................

17、.........143.2 截面形式及截面尺寸.....................................................................................................................143.2.1 主截面....................................................................

18、...........................................................143.2.2 橫截面...............................................................................................................................143.2.3 腹板和其它細部構造......

19、.................................................................................................153. 3 毛截面結(jié)合特性計算...........................................................................................................

20、........163. 4 主梁分段與施工階段劃分...........................................................................................................173.4.1 分段原則...........................................................................

21、.................................................173.4.2 具體分段............................................................................................................................173.4.3 主梁施工方法及注意事項................

22、................................................................................174. 主梁作用效應計算...............................................................................................................................

23、..194.1 恒載內(nèi)力計算.................................................................................................................................194.2 活載內(nèi)力計算.................................................................

24、...............................................................204.3 溫差次內(nèi)力及支座沉降次內(nèi)力計算............................................................................................234.3.1 溫差應力計算..............................

25、......................................................................................234.3.2 支座沉降計算....................................................................................................................254.

26、4 內(nèi)力組合.........................................................................................................................................265. 預應力鋼束的估算與布置.............................................................

27、........................................................305.1 預應力鋼筋估算.............................................................................................................................305.2 截面鋼束用量的估算公式.........

28、....................................................................................................315.3 預應力鋼束的布置..........................................................................................................

29、...............336. 預應力損失與有效預應力計算.............................................................................................................366.1 基本理論....................................................................

30、....................................................................366.2 預應力損失計算............................................................................................................................366.3 主梁截面幾何特性.

31、.......................................................................................................................387. 截面驗算............................................................................................