罕台川特大桥优化设计

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1、52桥梁建设2011年第3期文章编号：1003—4722(2011)03—0052—04罕台川特大桥优化设计邵吉林(浙江交通勘察设计有限公司，浙江杭州310014)摘要：罕台川特大桥跨越罕台川，同时上跨包神和包西2条电气化铁路。为了解决该桥原设计(三跨连续梁)存在的分段悬浇施工周期长、对铁路的运营干扰大，大直径长桩成孔困难、工期长且桩质量不易得到保证，实体墩自重大、不利于抗震、承载力要求高等问题，对原设计做了如下优化：将中跨跨中35m梁段改为钢一混结合梁，采用工厂化制作、现场吊装法施工；将实心墩改为矩形空心墩(主桥)及双方

2、柱框架墩(引桥)。对优化后的桥梁结构进行地震作用下墩底内力计算及地震作用动力弹塑性验算，结果表明，按照承载能力极限状态基本组合计算的桥墩承载力和稳定性均满足要求，桥梁结构满足抗震规范要求。关键词：预应力混凝土桥；连续梁；优化设计；结合梁；抗震分析中图分类号：U442．5文献标志码：AOptimalDesignofHantaichuanRiverBridgesHAOJi-lin(Zh@angTransportSurveyandDesignCo．，Ltd．，Hangzhou310014，China)Abstract：TheHa

3、ntaichuanRiverBridgespanstheHantaichuanRiverandalsotwoelectri—fiedrailwaysfromBaotoutoShenmuandfromBaotoutoXian．Toresolvetheproblemsinthe0一riginaldesign(a3-spancontinuousgirder)ofthebridge，suchasthelongconstructioncycleofcantileversegmentalconcretingofthegirderand

4、theconsiderableinterferenceoftheconstructionwithoperationoftherailways；thedifficultboringoflargediameterandlongpilesforthefounda—tions，thelongconstructiontimescheduleandtheuneasyguaranteeofqualityofthepiles；theheavyweight，unfavorableseismicresistanceanddemandingbe

5、aringcapacityofthesolidpiers，theoriginaldesignwasthereforeoptimizedasfollows：the35mlonggirdersectionatthemids—panofthecentralspanwaschangedintoasteelandconcretecompositegirdersectionwhichwouldbefabricatedinshop，liftedandinstalledinfield．Thesolidpierswerechangedint

6、otherectangularhollowpiers(forthemainbridge)anddoublesquarecolumnframepiers(fortheap—proachbridges)．Theinternalforcesinthepierfootingsoftheoptimizedstructureundertheac—tionofearthquakewerecalculatedandthedynamicelasticityandplasticityofthestructurewerechecked．Ther

7、esultsofthecalculationandcheckingindicatethatthecalculationofthebearingcapacityandstabilityofthepiersinaccordancewiththebasiccombinationofultimatestateofthebearingcapacitycanaccordwiththerelevantrequirementsandthestructurecansatisfythere—quirementsforseismicresist

8、anceaswel1．Keywords：prestressedconcretebridge；continuousgirder；optimaldesign；compositegird—er；seismicanalysis收稿日期：2010—08—23作者简介：邵吉林(1978一)，男，工程师，2001年毕