混凝土折线塔斜拉桥成桥索力确定的研究

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1、学兔兔www.xuetutu.com52桥梁建设2011年第1期文章编号：1003--4722(2011)01—0052—03混凝土折线塔斜拉桥成桥索力确定的研究王福春，粱力，李鑫(1．东北大学土木工程研究所，辽宁沈阳110004；2．沈阳市市政工程设计研究院，辽宁沈阳110015)摘要：沈阳市富民桥主桥是一座89m+242m+89m的混凝土折线塔斜拉桥，为确定合理的成桥索力，采用最小弯曲能量法并结合假载法和内力平衡法进行计算分析。根据静力平衡条件得到主梁初始断面尺寸；利用最小弯曲能量法得到主梁和桥塔弯矩较小

2、、索力基本均匀的成桥恒载合理状态；利用假载法进行验算，以保证各控制断面在最不利荷栽组合时的弯矩值在规范允许范围内。研究表明，折线塔斜拉桥成桥索力确定可采用与直线塔相同的方法；索力距离桥塔由近至远呈现由大到小、再由小至大的分布规律，中跨索力大于边跨索力；两塔相应位置索力大小不同。关键词：斜拉桥；折线塔；成桥恒载索力；初张力中图分类号：U448．27；U442．5文献标志码：AStudyofCableForceDeterminationforCompletedBridgeofaConcreteCable—Stay

3、edBridgewithKinkedPylons，ANGFu—chun一，LJANGLi，LJXin(1．ResearchInstituteofCivilEngineering，NortheasternUniversity，Shenyang110004，China；2．ShenyangMunicipalEngineeringDesignandResearchInstitute，Shenyang110015，China)Abstract：ThemainbridgeofFuminBridgeinShenyangC

4、ityisaconcretecable—stayedbridgewithkinkedpylonsandwithspanarrangement(89+242+89)m．Todeterminethereasonablecableforcesofthecompletedbridgeofthebridge，thecableforcesarecalculatedandanalyzedbytheleastbendingenergymethodincombinationwiththeassumedloadingandint

5、ernalforcebal—ancemethods．Thedimensionsoftheinitialcrosssectionofthemaingirderareobtainedaccord—ingtOthestaticbalanceconditions，thereasonablestateofthecompletedbridgedeadloadhavinglittlebendingmomentinthemaingirderandpylonsandalmostuniformcableforcesareobta

6、inedbytheleastbendingenergymethodandthecheckingcalculationismadebytheassumedloadingmethodinordertoensurethatthebendingmomentvaluesofalIcontrolledsectionsunderthemostunfavorableloadcombinationcanbewithintheallowablerangeasspecifiedinthecodes．Theresultsofthec

7、alculationandanalysisindicatethatthemethodfordeterminationofthecableforcesofthecompletedbridgeofthekinkedpyloncable—stayedbridgecanbethesamewiththatofthecompletedbridgeofthestraightpyloncable——stayedbridgeandthecableforcestakeonare——distributionlawfromthegr

8、eattothelittleandthenfromthelittletothegreatfromtheneartOthedistantfromthepylons．Thecableforcesofthecentralspanaregreaterthanthoseofthesidespansandtheforcesinthecorrespondinglocationsofthetwopylonsared