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1、第33卷第5期公路交通科技Vol．33No．52016年5月JournalofHighwayandTransportationResearchandDevelopmentMay2016doi:10．3969/j．issn．1002-0268．2016．05．010行车荷载引起桥梁振动对新老混凝土黏结性能影响121魏建军,付智,张金喜(1.北京工业大学交通工程重点实验室,北京100124;2.交通运输部公路科学研究院,北京100088)摘要:为了确定在混凝土早龄期时受到行车荷载引起桥梁振动对新老混凝
2、土黏结面抗拉性能的影响,采用峰值振动加速度为0．08g,0．16g,0．32g,3种振动能量,分别模拟轻、中、重3种交通状态引起的桥梁振动,对处于早龄期的新老混凝土黏结面进行振动试验。试验结果表明:振动发生在初凝前,3种形式的交通(轻、中、重)引起的振动对新老混凝土黏结面早期抗拉强度有增加作用。振动发生在初凝至终凝阶段,轻交通引起振动对新老混凝土黏结面的强度影响不明显;中等和重交通会造成黏结面早期抗拉强度(7d以前)下降。振动发生在终凝后,轻交通引起的振动对新老混凝土黏结面的强度影响不明显;中等交
3、通的振动会造成黏结面早期强度的下降;重载交通会造成黏结面的强度整体下降。关键词:道路工程;桥梁修复混凝土;试验研究;新老混凝土黏结性;行车荷载引起的振动中图分类号:U443．33文献标识码:A文章编号:1002-0268(2016)05-0061-05EffectofTrafficLoadInducedBridgeVibrationonAdherenceofNewandOldConcrete121WEIJian-jun,FUZhi,ZHANGJin-xi(1.KeyLaboratoryofTraf
4、ficEngineering,BeijingUniversityofTechnology,Beijing100124,China;2.ResearchInstituteofHighway,MinistryofTransport,Beijing100088,China)Abstract:Inordertotestifytheeffectoftrafficvibrationinducedbridgevibrationonthetensilepropertyoftheadherenceofnewando
5、ldconcreteduringearlyageofconcrete,avibrationtestonsuchadherenceisconducted.Inthetest,thevibrationenergywhosepeakaccelerationvaluesare0．08g,0．16gand0．32gareusedtosimulatethebridgevibrationsinducedbylight,middleandheavytrafficrespectively.Thetestresult
6、showsthat(1)whenvibrationsoccurredbeforeconcreteinitialsetting,allthe3levelsoftrafficinducedvibrationcanenhancetheearlyagebondstrengthofnewandoldconcrete;(2)whenvibrationsoccurredbetweeninitialsettingandfinalsetting,lighttrafficinducedvibrationhaslitt
7、leeffectonthebondstrength,middleandheavytrafficinducedvibrationscandecreasetheearlyage(before7d)bondstrength;(3)astotheadherenceofnewandoldconcretewhenvibrationoccurredafterconcretefinialsetting,lighttrafficinducedvibrationhaslittleeffectonthebondstre
8、ngthofnewandoldconcrete,itsearlyagebondstrengthdescendsundermiddletrafficinducedvibration,anditsbondstrengthdropslargelywithheavytrafficinducedvibration.Keywords:roadengineering;bridgerepairconcrete;experimentalstudy;adherenceofnewandoldconcre
