大跨径连续刚构桥跨中下挠的成因及对策

266()Vol.26No.6200712JOURNALOFCHONGQINGJIAOTONGUNIVERSITY(NATURALSCIENCE)Dec.,2007,,(,400074):.,.:;;;:U448.23:A:167420696(2007)0620046204ReasonAnalysisandCountermeasuresforExcessiveDeflectionofMidspaninLong2SpanContinuousRigidFrameBridgesQIDong2chun,ZHANGYong2shui,LIQiang(SchoolofCivilEngineering&Architecture,ChongqingJiaotongUniversity,Chongqing400074,China)Abstract:Theexcessivedeflectioninthemidspanisoneofthemainfaultsinlong2spancontinuousrigidframebridges.Thispapermakeacomprehensiveanalysisforthecausesoftheexcessivedeflectionandfindoutthecountermeasuresforthisprob2lem.Keywords:continuousrigidframebridge;excessivedeflectioninthemidspan;reasonanalysis;countermeasures:2006211206;:2006212204:(19782),,,,.e2mail:[e-mail].,.,,,..1).3,150m+270m+150m,1997,7a,.,,,.200311,,22.2cm,20.7cm.10cm,.2).5,162.5m+3245m+162.5m,1060m,1995.7a,,,2#3#30.5cm,3#4#21.2cm,4#5#22.6cm.3).6,105m+4140m+105m,1992.20026,22cm,.4).3,66m+120m+66m,1994.2000,22cm,,1.15mm.1,,,(),,,,.,.1.1.,2091982,,15%.,,.,,,(),,,.,,.,.1.2,,,,.,,,.,,245m,,32cm.,,22cm,.1.3,,(23d),,,,,.,,k,.1.4,,.,,,,,().1.5,,.,,,,,,.1.6,,,,,,,,,.1.7,,,,,.,,,,.,,,,,.,,,,.1.8,746:600kN,,.,8a,,.,.2,.2.1,,,,,.,,,.,1/4,,,.,,,0,,().,.2.2,,,,,.,,,L/1000L/1500.,.,,.,,.,,.2.318cm,.,.,.,,,.,,.,,,,.,0,,,.2.4,,,.3(95+170+95)m3.,22.5m,,.3.1,10.5m,1/16.2,,;,,,,0.558,,;,2,L/4,,,1.65.3.2(),,1/1000,17cm,84()26,,[6].,2,1/2.,,3/8L,1/41/5,1/4,4cm,.1.,2.3.1233.3,50cm,,U,,.,,,,2.5MPa,,.,.,,1cm.4100250m,,,,,,,,,.,.:[1].[M].:,1999.[2],.[J].,2005,(1):56258.[3],,.[J].,2004,(10):29231.[4].[J].,2004,(6):62264.[5],,,.[J].,2004,23(1):6212.[6],.[C]//2005.:,2005:1772183.946: