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1、鉚接鋼桁梁論文：鉚接連續(xù)鋼桁梁承載能力及病害整治研究【中文摘要】采用橋梁的常規(guī)試驗(yàn),對(duì)某橋外觀檢查、靜載實(shí)驗(yàn)和動(dòng)載實(shí)驗(yàn),然后與橋梁的理論計(jì)算得到結(jié)構(gòu)靜載位移、應(yīng)力、結(jié)構(gòu)自振特性等進(jìn)行比較,對(duì)該橋的運(yùn)營狀態(tài)有明確的認(rèn)識(shí)。主要研究內(nèi)容及成果包括：(1)對(duì)某鉚接連續(xù)鋼桁梁橋進(jìn)行了外觀檢查、上拱度檢查、線橋偏心檢查、結(jié)構(gòu)布置檢查、鋼梁裂紋和銹蝕及鉚釘檢查、支座檢查以及墩臺(tái)檢查,通過midas等有限元軟件對(duì)橋梁進(jìn)行理論分析。對(duì)本橋進(jìn)行靜載實(shí)驗(yàn)和動(dòng)載實(shí)驗(yàn),然后與橋梁的理論計(jì)算得到結(jié)構(gòu)靜載位移、應(yīng)力、結(jié)構(gòu)自振特性等進(jìn)行比較,評(píng)估該橋的運(yùn)營狀態(tài)。(2)理論和計(jì)算表明,某橋的
2、整體承載能力、豎向剛度、橫向剛度滿足規(guī)范要求,抗洪能力滿足規(guī)范要求。采用40Hz濾波,鋼梁橫向加速度不滿足要求；采用25Hz濾波,鋼梁橫向加速度不滿足要求。1#墩頂橫向振幅不滿足《橋檢規(guī)》通常值要求,下平縱聯(lián)以及縱梁間水平及橫向聯(lián)接系桿件病害較嚴(yán)重,鉚釘爛頭多,涂裝脫落面積大,部分縱梁橫聯(lián)下橫撐角鋼水平肢銹蝕殆盡。中跨跨中伸縮縱梁處鉸板拉斷,縱梁活動(dòng)端上下跳動(dòng)明顯。1#和2#橋墩裂縫寬度超過《橋檢規(guī)》限值。(3)對(duì)鉚接連續(xù)鋼桁梁的病害原因進(jìn)行了分析。某橋工作環(huán)境惡劣和失修導(dǎo)致涂裝失效、鉚釘嚴(yán)重銹蝕失效、桿件銹斷。板鉸的鋼板厚度薄,導(dǎo)致斷裂。(4)建議病害整治
3、方案為：鋼梁全面油漆,鋼橋主體采用《鐵路鋼橋保護(hù)涂裝》TB/T1527-2004的第6體系進(jìn)行涂裝。更換中跨跨中伸縮縱梁處鉸板。更換部分下平縱聯(lián)的斜桿和縱梁橫聯(lián)的下橫撐桿。將失效鉚釘更換為高強(qiáng)度螺栓?！居⑽恼縍outineuseofthebridgetest,visualinspectionofabridge,staticloadtestanddynamicloadtest,andthencalculatedwiththetheoreticalstructureofthebridgestaticdisplacement,stressandvibratio
4、ncharacteristicswerecompared,theoperationalstateofthebridgehasaclearunderstanding.Maincontentsandresults,including:(1)Rowofarivetedsteeltrussbridgeforavisualinspectiontocheckonthearch,cablebridgeeccentricinspection,structurallayoutinspection,steelbeamsandrivets,cracksandcorrosionch
5、ecks,bearingchecksandpierinspection,suchasfiniteelementsoftwarebymidasTheoreticalanalysisofthebridge.Deadloadofthebridgetestanddynamicloadtest,andthencalculatedwiththetheoreticalstructureofthebridgestaticdisplacement,stressandvibrationcharacteristicswerecomparedtoassesstheoperation
6、alstatusofthebridge(2)Theoryandcalculationsshowthattheoverallcarryingcapacityofthebridge,verticalstiffness,lateralstiffnesstomeettheregulatoryrequirements,floodcontrolcapacitytomeetregulatoryrequirements.With40Hzfilter,beamlateralaccelerationdoesnotmeettherequirements;with25Hzfilte
7、r,beamlateralaccelerationdoesnotmeettherequirements.Pier1,thelateralamplitudedoesnotmeetthe“bridgeinspectionrules“oftenvaluerequirements,thenextlevel,andlongitudinalstringersandtransverseconnectionbetweenthelevelofdiseaseismoreserious,Departmentofrods,rivetsLantoumorepaintoffarea,p
8、artofthelongitudinalcrossT
