不同应变率对混凝土轴拉全曲线影响的试验研究_陈育志

4522201511BuildingStructureVol．45No．22Nov．2015*121212111692210098MTS。10－710－610－510－4/s。-。-TU502A1002-848X201522-0071-04Experimentalresearchoneffectsofstrainrateontensilestress-straincurveofconcreteinaxialtensionconditionChenYuzhi12WangYao1ChenXudong21ArchitecturalEngineeringInstituteJinlingInstituteofTechnologyNanjing211169China2CollegeofCivilandTransportationEngineeringHohaiUniversityNanjing210098ChinaAbstractMTStestingmachinewasusedandballhingecomponentsweresetbetweenspecimensandtestingmachinetoeliminatetheinfluenceofeccentricityandadditionalbendingmomentintheprocessofconcreteaxialtensiletest．Thedynamicaxialtensiletestofconcretewithinfourstrainratemagnituderangeswascompletedwithloadingcontrolmethodofspecimenstrainandthestrainrateswere10－710－610－510－4/s．Thetestresultsshowthattheusedtestmethodsweresimpleandfeasible．Underdifferentstrainratesgoodsimilaritiesexistindifferentcompletestress-straincurveshapesofconcreteaxialtensiletests．Tensilestrengthandelasticmodulusincreasewiththeincreaseofstrainratebutthechangeofthestrainratehasnoobviousregulareffectontheultimatetensilestrainofconcrete．Keywordsconcreteaxialtensionstress-straincurvestrainrate*BY20120392013-K4-39。[e-mail]。0、。。、。、。123。。。-、、。10－710－610－510－4/s。201511.1∶∶∶=1∶0.45∶2∶4。42.510mm0.4～2.5mm。××1100mm×300mm×300mm24h。28d。374mm。150mm2。3。55.2MPa。1.2。。451。1。FC-SＲS。1.3。1、2。。。3。MTS32225mm±2.5mm。23。23。120°33。。。MTS310－710－610－510－4/s。22.1274522．1。1/1/sσ/MPaEt/GPaε/×10－6/J/m310－72.7528.712420010－63.4536.511923910－53.4038.610624010－44.8641.11323491。。、4。4、。410－52×10－42×10－32×10－2/s17.8%55.7%613.5%。。10－7/s12。ftdfts=A+Blgε'tdε't()s1ftdfts=1.0+0.23×lgε'tdε't()s2fts10－7/sftdε'tdε'ts10－7/s。223%。2.2Et《》SL352—2006Et=σ0．5ε0．53σ0.550%ε0.550%。5。15。。56。CadoniE712。。510－7/s10－610－510－4/s27.2%34.5%43.2%。372015EtdEts=1.0+0.14×lgε'tdε't()s4Ets10－7/sEtd。410－7/s14%。2.3《》SL352—2006。4545。6C10C20C10C2010%20%。。2.45。10－610－510－4/s10－7/s19.6%20.0%74.7%。3MTS10－710－610－510－4/s1。210－7/s23%14%。1．J．199737S1110-114．2．-J．1996242142-145．3．“”J．200324S167-71．4．D．1994．5．J．2001146721-725．6．J．200538697-103．7CADONIELABIBESKALBEＲTINICetal．Strain-rateeffectonthetensilebehaviorofconcreteatdifferentrelativehumiditylevelsJ．MaterialsandStructures200134121-26．47