铆接钢桁梁论文：铆接连续钢桁梁承载能力及病害整治研究.doc

铆接钢桁梁论文：铆接连续钢桁梁承载能力及病害整治研究

【中文摘要】采用桥梁的常规试验,对某桥外观检查、静载实验和动载实验,然后与桥梁的理论计算得到结构静载位移、应力、结构自振特性等进行比较,对该桥的运营状态有明确的认识。主要研究内容及成果包括：(1)对某铆接连续钢桁梁桥进行了外观检查、上拱度检查、线桥偏心检查、结构布置检查、钢梁裂纹和锈蚀及铆钉检查、支座检查以及墩台检查,通过midas等有限元软件对桥梁进行理论分析。对本桥进行静载实验和动载实验,然后与桥梁的理论计算得到结构静载位移、应力、结构自振特性等进行比较,评估该桥的运营状态。(2)理论和计算表明,某桥的整体承载能力、竖向刚度、横向刚度满足规范要求,抗洪能力满足规范要求。采用40Hz滤波,钢梁横向加速度不满足要求；采用25Hz滤波,钢梁横向加速度不满足要求。1#墩顶横向振幅不满足《桥检规》通常值要求,下平纵联以及纵梁间水平及横向联接系杆件病害较严重,铆钉烂头多,涂装脱落面积大,部分纵梁横联下横撑角钢水平肢锈蚀殆尽。中跨跨中伸缩纵梁处铰板拉断,纵梁活动端上下跳动明显。1#和2#桥墩裂缝宽度超过《桥检规》限值。(3)对铆接连续钢桁梁的病害原因进行了分析。某桥工作环境恶劣和失修导致涂装失效、铆钉严重锈蚀失效、杆件锈断。板铰的钢板厚度薄,导致断裂。(4)建议病害整治方案为：钢梁全面油漆,钢桥主体采用《铁路钢桥保护涂装》TB/T1527-2004的第6体系进行涂装。更换中跨跨中伸缩纵梁处铰板。更换部分下平纵联的斜杆和纵梁横联的下横撑杆。将失效铆钉更换为高强度螺栓。
【英文摘要】Routineuseofthebridgetest,visualinspectionofabridge,staticloadtestanddynamicloadtest,andthencalculatedwiththetheoreticalstructureofthebridgestaticdisplacement,stressandvibrationcharacteristicswerecompared,theoperationalstateofthebridgehasaclearunderstanding.Maincontentsandresults,including:(1)Rowofarivetedsteeltrussbridgeforavisualinspectiontocheckonthearch,cablebridgeeccentricinspection,structurallayoutinspection,steelbeamsandrivets,cracksandcorrosionchecks,bearingchecksandpierinspection,suchasfiniteelementsoftwarebymidasTheoreticalanalysisofthebridge.Deadloadofthebridgetestanddynamicloadtest,andthencalculatedwiththetheoreticalstructureofthebridgestaticdisplacement,stressandvibrationcharacteristicswerecomparedtoassesstheoperationalstatusofthebridge(2)Theoryandcalculationsshowthattheoverallcarryingcapacityofthebridge,verticalstiffness,lateralstiffnesstomeettheregulatoryrequirements,floodcontrolcapacitytomeetregulatoryrequirements.With40Hzfilter,beamlateralaccelerationdoesnotmeettherequirements;with25Hzfilter,beamlateralaccelerationdoesnotmeettherequirements.Pier1,thelateralamplitudedoesnotmeetthe“bridgeinspectionrules“oftenvaluerequirements,thenextlevel,andlongitudinalstringersandtransverseconnectionbetweenthelevelofdiseaseismoreserious,Departmentofrods,rivetsLantoumorepaintoffarea,partofthelongitudinalcr