2021年路橋?qū)I(yè)論文 橋梁設(shè)計(jì)論文

1、路橋?qū)I(yè)論文 橋梁設(shè)計(jì)論文 路橋?qū)I(yè)論文：橋梁設(shè)計(jì)論文 摘要：設(shè)計(jì)是根據(jù)設(shè)計(jì)任務(wù)書(shū)的要求和公路橋規(guī)的規(guī)定對(duì)勝利河橋進(jìn)行方案比選和設(shè)計(jì)的。對(duì)該橋的設(shè)計(jì)，本著“安全、實(shí)用、經(jīng)濟(jì)、美觀”的八字原則，本設(shè)計(jì)提出三種不同的橋型方案進(jìn)行比較和選擇。方案一為預(yù)應(yīng)力混凝土連續(xù)梁橋，方案二為梁拱組合體系橋，方案三為懸索橋。經(jīng)由以上原則以及設(shè)計(jì)施工等諸多方面考慮后，確定預(yù)應(yīng)力混凝土連續(xù)梁橋?yàn)樽罱K設(shè)計(jì)方案。 本預(yù)應(yīng)力混凝土連續(xù)梁橋共分為三跨（30m 50m 30m）主跨50m，邊跨對(duì)稱(chēng)30m；主梁采用單箱單室預(yù)應(yīng)力混凝土箱梁，跨中梁高為1.5m，支座處梁高為2.8m，截面高度按二次拋物線(xiàn)形式變化；橋面凈寬為7 21

2、.5m；設(shè)計(jì)荷載為公路-級(jí)。 在設(shè)計(jì)中，運(yùn)用了橋梁設(shè)計(jì)軟件Midas建立橋梁模型，并對(duì)橋梁恒載、活載及徐變內(nèi)力進(jìn)行分析計(jì)算，得出預(yù)應(yīng)力鋼束的預(yù)估值。最后對(duì)主梁的應(yīng)力、變形等進(jìn)行驗(yàn)算。經(jīng)分析比較及驗(yàn)算表明該設(shè)計(jì)計(jì)算方 _確，內(nèi)力分布合理，符合設(shè)計(jì)任務(wù)的要求 關(guān)鍵詞 橋梁設(shè)計(jì); 預(yù)應(yīng)力混凝土; 箱梁; 變截面連續(xù)梁 ;Midas橋梁模型 Abstract: The design is based on the requirements of the design task and Highway Bridge Regulation. The design of the bridge is carr

3、ied out in the eight-character principle of safety, pratically, economically and aeshetic by paring and choosing the best one. The first program is continous prestressed concrete grider bridge, the second one the beam bination of arch bridge,and the third one is the suspension bridge.Adoding to the

4、above principles and construction factors, the prestressed conous bridge is chosen to the ulti _te. The continous prestressed concrete girder bridge is divided into three inters, (30m 50m 30m), with the _in span of 50m, and 30m-symmetry one. Prestressed concrete box grider is used as the _in beam; t

5、he beam depth in the mid-span is 1.5m, while at the support bearing it is 2.8m.The sectional depth is changed in the form of parabolic.The width of the deck is 7 2x1.5m,and the design load is for the highway-I. In the design, the bridge design software MIDAS is used to get the calculation model. By

6、_yzing and puting the dead load, live load and internal for _, the esti _ted value of the prestressed strand is got. Finally, checking calculation is carried out to the stress and defor _tion of the _in beam. The results of the _ysis and checking calculation show that the design calculation method is correct , and the internal for _ distribution is reasonable to the design task. Key words: bridge design; prestressed concrete; box-girder; non-uniform continuous beam; MIDAS bridge model 目 錄 設(shè)計(jì)原始資料.1