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1、超大跨徑CFRP主纜懸索橋靜力性能理論分析第36卷第2期2014年4月土木建筑與環(huán)境工程JournalofCivil,Architectural&EnvironmentalEngineeringV01.36No.2Apr。2014doi:10.11835/j.issn.1674—4764.2014.02.008超大跨徑CFRP主纜懸索橋靜力性能理論分析王立彬,吳勇(南京林業(yè)大學(xué)土木工程學(xué)院,南京210037)摘要:首先推導(dǎo)了大跨懸索橋的無量綱形式平衡方程和協(xié)調(diào)方程得到索力和位移控制方程,然后推導(dǎo)了索力方程
2、中的特征參數(shù)A2的表達(dá)式,分析了參數(shù)A2和載荷比P對(duì)索力和位移增量的影響。在此基礎(chǔ)上,以3000m跨度懸索橋?yàn)樗憷治隽嗽谡磳?duì)稱載荷工況下考慮和不考慮拉索彈性———————————————————————————————————————————————伸長情況下的懸索索力和位移增量的特征,最后對(duì)比鋼索,分析了懸索橋跨度對(duì)CFRP纜索內(nèi)力、位移控制方程參數(shù)的影響,以及參數(shù)變化對(duì)纜索體系懸索橋靜力行為的影響,闡述了大跨CFRP懸索橋靜力行為的本質(zhì)特征,從理論上證明了CFRP懸索體系的優(yōu)勢和特點(diǎn)。關(guān)鍵詞:懸
3、索橋;CFRP索;鋼索;靜力性能中圖分類號(hào):U448.25文獻(xiàn)標(biāo)志碼:A文章編號(hào):1674—4764(2014)02—0048—09TheoreticalAnalysisofStaticPerformanceofSuperSpanSuspensionBridgewithCFRPCableWangLibin,WuYong(SchoolofCivilEngineering,NanjingForestryUniversity,Nanjing210037,P.R.China)Abstract:Equilibriu
4、mequationandcompatibilityequationcabledisplacementcontrolequationis———————————————————————————————————————————————arededucedtOgetthecableforceequationandparameter又2inequation.Thentheexpressiononofcharacteristiccableforcededuced.Meanwhile,theinfluencePisth
5、eincrementofcableforceanddisplacementcausedbyasa又2andloadratioanalyzed.Onthisbasis,taking3000mspansuspensionbridge———————————————————————————————————————————————calculatingexample。thecharacteristicsoftheincrementofcableforceandcabledisplacementundersymmet
6、ricalandasymmetricalloadarestudied.Inthiscase,tWOdifferentconditionsareconsidered.Onetakestheelasticelongationonintoconsideration,buttheotherdoesnot.Atlast,comparedwiththesteelcable,theinfluencetheparameterincableforceequationanddisplacementcontrolequatio
7、ncausedbyspanisanalyzed.Theinfluenceofthestaticperformanceofsuspensionbridgebyparameterchangingisanalyzed———————————————————————————————————————————————staticperformanceofsuperspanCFRPsuspensionbridgeareaswell.Thesubstantivecharacteristicsoftheclearedandt
8、hesuperiorityandcharacteristicsofCFRPcablestructurearedemonstratedintheory.Keywords:suspensionbridge;CFRPcable;steelcable;staticperformance現(xiàn)代懸索橋主纜一般都采用鋼索,而纜索體系的纜索材料用量隨跨度的平方增長。如果采用傳統(tǒng)的鋼索,主纜的自重將特別可觀,其自重應(yīng)力將消耗掉容許應(yīng)力的相當(dāng)大部分