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1、第34卷第3期水利水電科技進(jìn)展2014年5月Vol.34No.3AdvancesinScienceandTechnologyofWaterResourcesMay2014DOI:10.3880/j.issn.10067647.2014.03.014碾壓與常態(tài)混凝土組合的某升船機(jī)上閘首結(jié)構(gòu)配筋方案馬亞岑,汪基偉,冷搖飛(河海大學(xué)土木與交通學(xué)院,江蘇南京搖210098)摘要:針對既要控制裂縫寬度又要控制裂縫長度的碾壓與常態(tài)混凝土組成的某升船機(jī)上閘首整體塢式結(jié)構(gòu),通過對比不同配筋方案的鋼筋混凝土非線性有限元計算結(jié)果,提出以材料強(qiáng)度標(biāo)準(zhǔn)值所得裂縫長度和寬度進(jìn)行底板裂縫控制
2、從而確定底板常態(tài)混凝土最小厚度,以材料強(qiáng)度平均值所得裂縫長度確定鋼筋布置范圍的計算原則;同時給出了符合限裂設(shè)計要求的底板常態(tài)混凝土最小厚度和配筋方案,并探討了縫面水壓的不同施加方式對裂縫的影響。計算結(jié)果表明,當(dāng)縫面水壓按全水頭分布施加時,若裂縫長度超過鋼筋布置范圍,則裂縫會不斷擴(kuò)展,引起結(jié)構(gòu)失效;縫面水壓按滲透壓力分布和三角形分布施加時,裂縫擴(kuò)展能夠收斂,且前者所得的裂縫寬度和長度均大于后者。關(guān)鍵詞:鋼筋混凝土;上閘首結(jié)構(gòu);升船機(jī);配筋方案;裂縫寬度;裂縫長度;有限元分析中圖分類號:U642;TV332搖搖搖文獻(xiàn)標(biāo)志碼:A搖搖搖文章編號:10067647(2014
3、)03006505DeterminationofstructuralreinforcementschemesforupperlockheadofashipliftmadeofRCCandnormalconcrete//MAYacen,WANGJiwei,LENGFei(CollegeofCivilandTransportationEngineering,HohaiUniversity,Nanjing210098,China)Abstract:Itisnecessarytocontrolcrackwidthandcracklengthfortheupperlockh
4、eadofashiplift,whichisgenerallyadock鄄typestructuremadeofrollercompactedconcrete(RCC)andnormalconcrete.Basedonthecomparisonofthenonlinearfiniteelementcalculationresultsofreinforcedconcretewithdifferentstructuralreinforcementschemes,acalculationprinciplewasproposed.Accordingtothisprinci
5、ple,concretestandardstrengthisusedtocontrolcrackwidthandcracklengthinthebottomslabandtodeterminetheminimumthicknessofnormalconcreteofthebottomslab.Thecracklength,determinedbyaveragestrengthofconcrete,isusedtodeterminethescopeofreinforcement.Theminimumthicknessandthestructuralreinforce
6、mentschemeofnormalconcretebottomslabweresuggested.Theinfluenceofapplyingwaysofwaterpressureonthecracksurfaceoncrackswasanalyzed.Theresultsshowedthatwhenthewaterpressureonthecracksurfacewasfullwaterhead,thecracksexpandeduntilitexceededthereinforcementscope,whichcausedstructuralfailure.
7、Whenthewaterpressurewasseepagepressureanditwasappliedinatriangulardistribution,thecrackswassteady;bothcrackwidthandcracklengthobtainedinthescenariowithfullwaterheadarelargerthanthatinthescenariowithseepagepressure.Keywords:reinforcedconcrete;theupperlockheadstructure;shiplift;reinforc
8、ement
