路橋專業論文：橋樑設計論文

摘要：設計是根據設計任務書的要求和《公路橋規》的規定對勝利河橋進行方案比選和設計的。對該橋的設計，本著“安全、實用、經濟、美觀”的八字原則，本設計提出三種不同的橋型方案進行比較和選擇。方案一為預應力混凝土連續樑橋，方案二為樑拱組合體系橋，方案三為懸索橋。經由以上原則以及設計施工等諸多方面考慮後，確定預應力混凝土連續樑橋為最終設計方案。

本預應力混凝土連續樑橋共分為三跨（30m 50m 30m）主跨50m，邊跨對稱30m；主樑採用單箱單室預應力混凝土箱梁，跨中樑高為1.5m，支座處樑高為2.8m，截面高度按二次拋物線形式變化；橋面淨寬為7 2×1.5m；設計荷載為公路-Ⅰ級。

在設計中，運用了橋樑設計軟體Midas建立橋樑模型，並對橋樑恆載、活載及徐變內力進行分析計算，得出預應力鋼束的預估值。最後對主樑的應力、變形等進行驗算。經分析比較及驗算表明該設計計算方法正確，內力分佈合理，符合設計任務的要求

關鍵詞 橋樑設計; 預應力混凝土; 箱梁; 變截面連續樑 ;Midas橋樑模型

Abstract: The design is based on the requirements of the design task and "Highway Bridge Regulation". The design of the bridge is carried out in the eight-character principle of "safety, pratically, economically and aeshetic" by comparing and choosing the best one. The first program is continous prestressed concrete grider bridge, the second one the beam combination of arch bridge,and the third one is the suspension oding to the above principles and construction factors, the prestressed conous bridge is chosen to the ultimate.
The continous prestressed concrete girder bridge is divided into three inters, (30m 50m 30m), with the main span of 50m, and 30m-symmetry one. Prestressed concrete box grider is used as the main beam; the beam depth in the mid-span is 1.5m, while at the support bearing it is sectional depth is changed in the form of net 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 analyzing and computing the dead load, live load and internal force, the estimated value of the prestressed strand is got. Finally, checking calculation is carried out to the stress and deformation of the main beam. The results of the analysis and checking calculation show that the design calculation method is correct , and the internal force distribution is reasonable to the design task.
Key words: bridge design; prestressed concrete; box-girder; non-uniform continuous beam; MIDAS bridge model
目 錄設計原始資料…………………………………………………………………………….1
第一章 方案比選 ………………………………………………………………………2
第二章 上部結構形式及尺寸擬定 …………………………………………………5
一．主跨徑的擬定 …………………………………………………………………… 5
二．順橋向樑的尺寸擬定 …………………………………………………………… 5
三．橫橋向的尺寸擬定 ……………………………………………………………… 5
四．橋面鋪裝 ………………………………………………………………………… 6
五．本橋主要材料 …………………………………………………………………… 6
第三章 橋面板的計算 …………………………………………………………………8