【正文】 39。.? 翼緣斷開處：同 桿件，不需要檢算。??左 2039。? 斷開部分：①拼接板： 60948??2039。 ， ，因此 39。2(??? 墊板： 。?——分肢重心間距離。yl??有效長細比： ?查表得： 5??節(jié)點內(nèi)： 節(jié)點外： 80 受壓桿件按綴板強度檢算時桿件有效面積計算主桁桿件受力桿件 F2，F(xiàn)3，F(xiàn)4 上有綴板構造，它們承受荷載強度與其上的綴板有一定的關系。l??有效長細比： ?據(jù)兩個面內(nèi)長細比的較大者查表得： 5?節(jié)點內(nèi)有效面積： ???節(jié)點外有效面積： 76桿件計算如下：3F與綴板截面相垂直的面內(nèi)彎曲時：桿件計算長度： ?截面幾何特性值： ?截面回轉(zhuǎn)半徑： 長細比： 0??綴板面內(nèi)彎曲時：桿件計算長度： 13lc?重載運輸下鐵路簡支鋼桁梁橋加固設計42截面幾何特性值： 439。重載運輸下鐵路簡支鋼桁梁橋加固設計36第三章 橋梁結(jié)構檢算中構件有效面積計算 無綴板受壓桿件有效面積計算由于桁架桿件中，有一部分主要承受壓力，需要按照《檢規(guī)》計算壓桿的受壓承載力是否滿足規(guī)范要求，故需要按照要求對壓桿的有效面積進行計算。該橋的縱梁安置于橫梁的上翼緣上。預應力混凝土橋跨是由兩片 的預應力混凝土 T 型梁通過濕接縫和橫隔板相連組成的。鋼筋對稱地布置在弦桿的周圍，并在距離為 的兩個裝配焊接錨固區(qū)間進行張拉。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3ABSTRACTWithin 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(nèi)現(xiàn)役鋼橋概況 .........................................................................................................................................6 本課題在國內(nèi)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 設計主要內(nèi)容 ..................................................................................................................................................9第一章 全橋結(jié)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(lián)桿件截面組成及尺寸表 ...........................................................................................................14 端、中橫聯(lián)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(lián)桿件截面組成及尺寸 ...............................................................................................................18 小結(jié) ...............................................................................................................................................................18重載運輸下鐵路簡支鋼桁梁橋加固設計4第二章 橋梁各桿件截面幾何特性計算 ...............................................................................................................19 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(lián)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 小結(jié) ................................................................................................................................................................35第三章 橋梁結(jié)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 ...................................................................................................................40 受壓桿件按綴板強度檢