【正文】 重載運輸下鐵路簡支鋼桁梁橋加固設計 專業(yè)：土木工程 姓名： XX 指導老師： XX 摘 要 該鐵路橋位于甘肅省嘉峪關市境內，建于上世紀 60 年代，共三跨，全長 184 米，其中兩跨為上承式簡支鋼 桁梁橋，跨度均為 64 米。一跨為預應力混凝土簡支梁橋，跨度為 米。本設計根據鐵路橋梁標準中 — 活載及今后將施行的重載運營要求 ,依照《鐵路橋梁檢定規(guī)范》對此鋼桁橋的各受力桿件強度、連接點強度、橫向剛度等進行相關檢算、分析 。依據《鐵路橋涵設計基本規(guī)范》及《鐵路橋梁鋼結構設計規(guī)范》對該鋼橋采用 增加重力式橋墩的方法進行加固，并給出相應的加固設計計算。 關鍵詞 鐵路鋼桁梁橋，承載力驗算，加固設計， 增加重力式橋墩 ，節(jié)點板 重載運輸下鐵路簡支鋼桁梁橋加固設計 3 ABSTRACT Within the territory of the railway bridge is located in the city of Jia Yu Guan in gansu province, built in the 1960s, a total of three cross, two of the cross for the simply supported steel truss bearing type, a cross for prestressed concrete beam bridge. Because the service life of steel bridge is longer, and traffic on the bridge increased year by year, and the constant improvement of the transportation speed. Bridges safety operation there may be a hidden danger. According to the railway bridge standard live load and the future will be implemented overload operation requirements and in accordance with《 the railway bridge verification code》 , we checked the main girder of steel bridge bar,and vertical and horizontal beams, longitudinal and transverse stiffness etc related check putation analysis. Found the steel bridge under the effect of overloading, the bearing capacity of the bottom chord and partial node plate. According to《 he basic specifications for design of railway bridges》 and《 the railway bridge girder steel structure design specification》 ,we shall increase in main girder of the steel bridge reinforcement scheme, and gives the corresponding reinforcement design. Through analysis and calculation, the calculation of this reinforcement scheme is correct and reasonable .After strengthening, the bridge bearing capacity and lateral stiffness is strong enough to meet current and future load safety operational indicators, and is in line with the requirements of design task. Key words: Railway steel truss Bearing capacity Is checked and reinforcement Increase in main girder Prestreessing 目錄 前言 ................................................................................................................................................................................................6 國內現役鋼橋概況 ......................................................................................................................................................... 6 本課題在國內外的研究狀況及發(fā)展趨勢 ................................................................................................................. 6 課題目的及意義 ............................................................................................................................................................. 7 工程概況 .......................................................................................................................................................................... 8 .................................................................................................................................................................. 9 第一章 全橋結構及構件圖 ................................................................................................................................................. 10 全橋構造布置 ................................................................................................................................................................ 10 主桁桿件截面組成表 .................................................................................................................................................. 12 上下平縱聯桿件截面組成及尺寸表 ........................................................................................................................ 14 端、中橫聯桿件截面組成及尺寸表 ........................................................................................................................ 16 縱橫梁截面組成及尺寸表 ......................................................................................................................................... 17 縱梁間橫聯桿件截面組成及尺寸 ............................................................................................................................ 18 小結 ................................................................................................................................................................................. 18 第二章 橋梁各桿件截面幾何特性計算 .......................................................................................................................... 19 重載運輸下鐵路簡支鋼桁梁橋加固設計 4 主桁桿件截面幾 何特性計算 ..................................................................................................................................... 19 縱梁及橫梁截面幾何特性計算 ................................................................................................................................ 27 上下平縱聯桿件截面幾何特性計算 ........................................................................................................................ 30 主桁桿件及縱橫 梁毛截面幾何特性值匯總表 ...................................................................................................... 31 主桁桿件 因栓孔損失的 截面幾何特性值 計算 ...................................................................................................... 32 主桁桿件及縱橫梁凈截面幾何特性值計算表 ...................................................................................................... 34 .................................................................................................................................................................................. 35 第三章 橋梁結構檢算中構件有效面積計算 .................................................................................................................. 36 無綴板受壓桿件有效面積計算 ................................................................................................................................ 36 有綴板受壓桿件有效面積計算 ............................................................