钢结构人行天桥箱梁上翼缘有效宽度分析

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1、新疆大掌建筑工程掣啦兜硕士掌位论文AbstractInthedesignofsteelbox-girderbridge，theshearlageffectofbox-girderwithwideflangeandsmallspanisoutstanding．Inelementarybeambendingtheory,itisassumedthatthestressesareconstantthroughthewidthofthebeam．However,forthewideflangegirders，thestresse

2、sarenotuniform．Thisvariationofstressesisduetotheactionofin·planeshearstrainintheplate，whichittermed“shear-lag”．Stresseslargerthantheelementarybendinguniformstressthusdevelopatthe-flangeconnection．Anappropriatereduced“effectivewidth”oftheplate—withuniformstressequ

3、altothemaximumlongitudinalstress—hasbeenwidelyusedbyengineersinconjunction、Ⅳiththeelementarybeambendingtheory．Therearenotdefinitecodeprovisionofevaluationofeffectivewidthaboutsteelbox—girderinmanycountries，especiallycurvedbridgebecauseitsevaluationofeffectivewidt

4、hvarywimtheradiusofthecurve．Inthispaper．thepracticaltablescalculatingtheeffectivewidthofdifferentstructuresareprovidedtoperfectformulationconcernedinthestand．ard．Acombinationoffiniteelementmethodandsoft．wareANSYSareadoptedtoanalysethesimplesupported-span,theconti

5、nuousspan，thecurvedsimplesupported—spanandthecurvedcontinuousspantoprovidethepracticaltablescalculatingtheeffectivewidth．Asiswellknown，theeffectivewidthdependsonseveralfactors，suchastheCROSS-sectionwidth，theheightofweb，thespacingofspanandsoon．Wecanconcludethatwid

6、th／spanratio(overhangwidth／spanandcentralwidth／span)isthegoverningfactoroftheeffectivewidth．Theeffectivewidthisnotconstantalongthespanofgirder,anddifferentpointofinterestinthespanshouldbeselectedaccordingtothedifferentstructure．Forsimplysupported-span，midspanisse

7、lectedasthepointofinterest．Forcontinuousspan，thewholespanisdividedintoseveralnl新疆大掌建筑工程掌院硕士掌位-沦文sub—spans，i．e．，exteriorspan，interiorspan，andinternalsupportspan，andtheyareallpointsofinterest．Forcurvedbridge，theeffectivewidthratiovarywiththeradiusofthecurve，andthee

8、ffectivewidthratioofsometypicalcurvesarelisted．Inthispaper,thepracticaltablesandthecharacteristicsoftheeffectivewidthratioareprovidedbyagreatmassofcalculation．