拱橋畢業設計說明書(已修改)

　

【正文】 摘 要 本橋位于滬蓉國道主干線湖北省宜昌至恩施段 K29+245 處，跨越佑溪，溝寬約 110m。河道與路線正交，河床穩定，河道順直，平時溝內水量較少，溝底較深，比降較大，泄洪順暢。 設計主要分為橋型方案比較和推薦方案設計，橋型方案中擬定了三個比選方案，方案一為混凝土簡支梁橋，方案二為預應力混凝土箱形連續梁橋。方案三為上承式混凝土箱形拱橋。通過方案比選，最終選用方案三：上承式混凝土箱形拱橋，跨徑組成為凈跨徑 64m拱跨和兩邊各一跨 8m簡支板引橋跨。 橋梁全長 ，橋面凈空為 外側 ＋ 橋面寬凈 ＋ ，橋面橫坡 2%。本橋上部為空腹式，下部為重力式實體橋臺，引橋采用輕型橋臺和柱式橋墩。 結構計算主要針對上部結構蓋梁、立柱、拱箱，下部結構橋臺進行了細部尺寸擬定、內力計算、配筋計算、截面驗算。 橋梁下部結構為重力式墩，基礎采用剛性擴大基礎。本設計僅對 1號 橋墩進行了強度及穩定性驗算。 關鍵詞： 拱軸系數； 箱形 拱肋； 主拱圈 內力組合；截面強度； 剛性擴大基礎。 Abstract According to the graduation project task paper of the bridge engineering graduates,this bridge is located in section K249+245 of the HuRong national highway in Hubei from yichang to enshi,which crossing the creek riverway is orthogonal with the road and is very deep with little river water at ordinary times. Bottom of trench is more depth with much gradient, and flood discharge smoothly. The design maily focus on the parison between the project style of the bridge and the design of the remended style. There are three alternatives on the bridge style,the fist one is a concrete simple beam bridge,the second is a prestressed concrete continuous girder bridge box,and the third one is a open spandrel topbear arch bridge. Through paring the three projects,and the third one is the bridge has a span across 64m arch and an 8m simply supported slab by every side. The bridge is at length,with a reinforced concrete impactproof guard railing by the outboard, a width 11m and a waveform impactproof guardrail and a 2% deck transverse slope. The upper of the bridge is empty arch and the below is gravity type abutment approach bridge has a light the abutment and pillar type structural calculation are mainly aimed at the detail sizes,internal forces,reinforcement and cross section area on the upper capping beam structure,upright column,arch box and the below structure of the bridge bridge adopts the gravity type pier and rigid expanding structure in lower foundation. In this article, take the strength and stability of the number 1 bridge 39。pier as an example.. Key words: arch axis coefficient。arch rib。 internal force。 internal force bination。 rigidity of section。 rigid expanding foundation 目 錄 摘 要 ......................................................................................................................................... I Abstract....................................................................................................................................... II 第一章 結構設計方案 .............................................................................................................. 1 設計資料 ..................................................................................................................... 1 橋梁名稱 .......................................................................................................... 1 基本資料 .......................................................................................................... 1 設計標準 .......................................................................................................... 2 方案比選 ..................................................................................................................... 2 方案一：簡支梁橋 .......................................................................................... 2 方案二：等截面小箱形連續梁橋 .................................................................. 3 方案三： 鋼筋混凝土箱形拱橋 ...................................................................... 4 方案選擇 ..................................................................................................................... 5 第二章 推薦方案橋梁上部結構尺寸擬定 .............................................................................. 6 方案簡介及上部結構尺寸擬定 ................................................................................. 6 拱肋 .................................................................................................................. 6 蓋梁與腹孔墩 .................................................................................................. 6 橫隔板 .............................................................................................................. 6 橋面板及橋面鋪裝 .......................................................................................... 6 排水設施 .......................................................................................................... 6 主要材料 ..................................................................................................................... 6 橋梁設計荷載 ............................................................................................................. 7 第三章 蓋梁計算 ...................................................................................................................... 8 上部結構恒載計算 .................................................................................................... 8 橋面鋪裝及空心板計算 .................................................................................. 8 恒載內力計算 ................................................................................................ 11 活載計算 .................................................................................................................. 15 活載橫向分布系數計算 ................................................................................ 15 按順橋向可變荷載移動情況求支座反力 .................................................... 20 可變荷載橫向分布后各梁支點反力 ............................................................ 21 各梁 恒載、可變荷載反力組合 .................................................................... 24 三柱式反力 Gi計算 ........................................................................................ 26 內力計算 ................................................................................................................... 27 各截面的彎矩 ..................................