摘 要
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,對津霸公路K4+320橋梁進(jìn)行方案比選和設(shè)計(jì)的。對該橋的設(shè)計(jì)，本著“安全、經(jīng)濟(jì)、美觀、實(shí)用”的八字原則，經(jīng)由以上的八字原則以及設(shè)計(jì)施工等多方面考慮，確定設(shè)計(jì)橋型為預(yù)應(yīng)力混凝土連續(xù)箱梁橋。
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使用工程中恒載以及活載的作用，采用整體的體積以及自重系數(shù)，荷載集度進(jìn)行恒載內(nèi)力的計(jì)算。運(yùn)用修正偏心壓力法求出活載橫向分布系數(shù)。進(jìn)行了梁的配筋計(jì)算，估算了鋼絞線的各種預(yù)應(yīng)力損失，并進(jìn)行預(yù)應(yīng)力階段和使用階段主梁截面的強(qiáng)度和變形驗(yàn)算、錨固區(qū)局部強(qiáng)度驗(yàn)算和撓度的計(jì)算。下部結(jié)構(gòu)采用以鉆孔灌注樁為基礎(chǔ)的雙墩柱，采用盆式橡膠支座，并對橋墩和樁基礎(chǔ)進(jìn)行了計(jì)算。




















關(guān)鍵詞: 預(yù)應(yīng)力混凝土；連續(xù)梁橋；箱型梁；單箱雙室；修正偏心壓力法；AutoCAD。

Abstract
This is a partial strut design of a flyover crossing that is over the railway in jin-ba highway, according to designing assignment and the standard of road and bridge. The purpose of make the type of the bridge corresponding is the ambience and cost saving。After the comparisons of economy, appearance, characteristic under the strength and effect, the pre-stressed concrete continuous bridge is selected.
In this design, the checking calculation of strength of main girder was preceded not only in prestressed statement but also in using statement; deflection, preamble and the assessment of reinforcing steel bar were checked too.
The pier of the bridge was basing on digging pile, and adopted rubber pot bearing. According to the characteristic of the Overpass Bridge and spot condition, it adopted the method that the cantilever job placing combined with bracket job placing.


















Keywords : Prestressed concrete；AutoCAD；simple supported beam bridge； cast-in-place pile.

目 錄
1 引言 1
1.1工程概況 1
1.2設(shè)計(jì)基本資料 2
2 橋型方案比選 3
2.1橋梁設(shè)計(jì)原則 3
2.2梁部截面形式比選 7
3 初步設(shè)計(jì) 8
3.1主要材料 8
3.2 橋型及縱、橫斷面布置 9
4 梁的有效寬度計(jì)算 13
4.1橋的剪力理論 13
4.2橋的剪力滯計(jì)算 15
5 主梁內(nèi)力計(jì)算 17
5.1恒載的內(nèi)力計(jì)算 17
5.2活載內(nèi)力計(jì)算 18
5.3沖擊系數(shù)的計(jì)算 19
5.4 荷載橫向分布系數(shù)的計(jì)算及荷載增大系數(shù)的計(jì)算 19
5.5汽車荷載內(nèi)力計(jì)算 21
6 溫度引起的內(nèi)力計(jì)算 26
7 支座位移引起的內(nèi)力計(jì)算 28
8 內(nèi)力組合與彎矩折減 29
8.1承載力極限狀態(tài)的基本組合 29
8.2正常使用極限承載力組合 30
8.3彎矩折減 32
9 預(yù)應(yīng)力筋的設(shè)計(jì)與布置 33
9.1預(yù)應(yīng)力鋼筋配筋原理 33
9.2預(yù)應(yīng)力鋼筋的選用 35
9.3有效截面的截面特性 36
9.4配筋量計(jì)算結(jié)果 36
10 預(yù)應(yīng)力損失計(jì)算 38
10.1各方面引起的應(yīng)力損失 38
10.2有效預(yù)應(yīng)力的計(jì)算 45
11 承載能力極限狀態(tài)驗(yàn)算 47
11.1正截面抗彎承載力驗(yàn)算 47
12 持久狀況正常使用極限狀態(tài)驗(yàn)算 51
13 撓度的計(jì)算與預(yù)拱度設(shè)置 56
13.1撓度計(jì)算、驗(yàn)算及預(yù)拱度設(shè)置 56
13.2撓度計(jì)算結(jié)果 57
14 下部結(jié)構(gòu)的計(jì)算 59
14.1橋墩樁長的計(jì)算 59
14.2橋臺樁長計(jì)算 60
結(jié) 論 62
參考文獻(xiàn) 63
致 謝 65