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:100128360(2002)0220095205,(,730070):,,2,(),,,:;;;;:TU378.2:AExperimentstudyonprestressedconcretebeamsofpostponingcondensationZHAOJian2chang,WANGQi2cai(SchoolofCivilandArchitecturalEngineering,LanzhouRailwayUniversity,Lanzhou730070,China)Abstract:Onthebasisoftheexperimentofprestressedconcretebeambyplacingmaterialofpostponingcon2densationbetweenconcreteandprestressed2bar,therangeoffrictionresistancewhichneedstobeovercomewhenprestressedbarsaretensionedispresented.Throughcomparingtheprestressedconcretebeamwiththetraditionalpost2tensionedprestressedconcretebeamintheaspectssuchascrackmoments,ultimatemoments,crackforms,load2deflectiongraphandsoon,theconclusionhasbeengainedthattheperformanceofthepre2stressedconcretebeamisalmostassameasthetraditionalpost2tensionedprestressedconcretebeamwhichhasstickyforcebetweenconcreteandprestressed2bar.Theconclusionofthispapercanprovidereferencesforthedesigneroftheprestressedconcretesystem.Keywords:postponingcondensation;prestressedconcretebeam;experimentstudy;frictiondrag;workperfor2mance,,,,,,,,,,,,:2001207230;:2001212207:(96G56):(1962),,,,,,,,,,,,,,,,,,,242Vol.24No.220024JOURNALOFTHECHINARAILWAYSOCIETYApril2002,,,,,,2,(),,,11.1,,10d15d20d25d4,,3,(1),;(2);(3),,;,100%,,,,,,,1,20110d15d20d25d1(2)2:41,422(1)2:51,523100%(2)2:11,122:31,322:61,622:21,224100%(2)2:91,922:101,1022:71,722:81,821.2C40,=11.372.73,0.52.0cm,1,12,30d,3,30MPa,150mm150mm150mm3100mm100mm300mm,,;,21.3,,5.51116226924273032MPa8,1.43,,,5kN,5min,322.1,,;,,22,1015d,1.33kNöm,4.45Nöcm2,10d1.5kNöm,20d2.33kNöm,511141821242832384449546166143,(),44:(1),30d,3.04.5Nöcm2,1.773.5Nöcm230d,;(2)30d,,60d,145Nöcm2,30d,,2ödömökNökNm-1ömökNökNm-110113.03.001.00123.03.301.1015313.02.500.83323.02.790.9320613.03.761.26623.03.601.2025213.03.991.33213.03.901.3010913.04.911.66923.04.501.50201013.07.432.481023.06.972.3342.2,313231,,1(51,52)(71,72),1,;2(41,42),(61,62)(81,82),2,,,(101,102)(41,42),(61,62)32,,20d,3132,,792;,31ökNmökNm()1(2)414261.566.564.160.7145.5140.0142.6136.82(1)515261.857.059.460.7114.0114.0114.0120.63100%(2)616261.861.861.860.7146.3142.3144.3136.8717261.857.059.360.7109.3114.0111.6120.6818266.561.864.160.7133.0137.8135.4136.8100%(2)10110257.552.354.952.8128.3133.0130.6136.832ödökNmökNm10111266.368.267.360.7123.5128.3125.9136.815313261.866.564.160.7128.5142.5135.4136.820616261.861.861.860.7146.3142.3144.3136.825212266.561.864.160.7128.3128.3128.3136.810919252.350.251.252.8128.3133.0130.6136.82010110257.552.354.952.8128.3133.0130.6136.82.3551(1)4161(2)7181101:5171,1,,416181,2,;101,2,2.42(p2f)64161718122(p2f)6,2,4161p2f71p2f,81p2f2.5,2,33.5MPa,,2,130d,1015d,3.04.5Nöcm2;2,8924562(p2f)3,,,(20m),()(),20m,,2,,,,,:[1].[M].:,1996.24-34.[2].[M].:,1993.33-39.[3].[M].:,1988.43-60.[4].[M].:,1990.50-55.[5]JTJ023285,[S].:,1985.[6]TBJ106291,[S].:,1992.[7]JGJöT92293,[S].:,1993.()992