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钢-聚丙烯混杂纤维混凝土柱抗震承载力试验研究.docx

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钢-聚丙烯混杂纤维混凝土柱抗震承载力试验研究 Abstract Steel-polypropylenehybridfiberreinforcedconcrete(SPHFC)columnshavebeenattractingsignificantinterestinrecentyearsduetotheirsuperiorseismicperformance.ThispaperpresentsanexperimentalinvestigationontheseismicbehaviorofSPHFCcolumns.ThestudyaimedtoevaluatetheseismicperformanceofSPHFCcolumnsandcomparetheresultswiththoseofconventionalreinforcedconcrete(RC)columns.Atotaloffourcolumnspecimens,includingtwoSPHFCcolumnsandtwoconventionalRCcolumns,weretestedundercyclicloadinguntilfailure.TheexperimentalresultsshowedthatSPHFCcolumnsdemonstratedsuperiorseismicperformancecomparedtoconventionalRCcolumns.Specifically,SPHFCcolumnsexhibitedhigherpeakload-carryingcapacity,largerdeformationcapacity,andbetterenergydissipationcapability.ThestudyalsorevealedthattheinclusionofpolypropylenefibersintheconcretemixincreasedtheductilityandtoughnessoftheSPHFCcolumns,resultinginamoreresilientanddamage-tolerantstructure.Overall,thefindingsofthisstudysuggestthatSPHFCcanbeaneffectivesolutionforenhancingtheseismicperformanceofconcretestructures. Keywords:Steel-polypropylenehybridfiberreinforcedconcrete,seismicperformance,peakload,deformationcapacity,energydissipation 1.Introduction Concreteiswidelyusedintheconstructionofbuildingsandbridgesduetoitshighcompressivestrengthanddurability.However,thebrittlebehaviorofconcreteundertensileloadinglimitsitsperformanceinseismicevents.Toovercomethislimitation,variousreinforcementmaterialshavebeenincorporatedintotheconcretemixtoenhanceitstensilestrengthandductility.Steelfibersandpolypropylenefibersaretwocommonlyusedfiberreinforcementsinconcrete.Steelfibersareknowntoimprovethetensilestrengthandstiffnessofconcrete,buthavesomedrawbacks,suchascorrosionandhighcost.Ontheotherhand,polypropylenefibershaveexcellentdurabilityandcorrosionresistance,buttheiruseinconcretehasbeenlimitedduetotheirlowmodulusofelasticityandultimatetensilestrength. Inrecentyears,researchershaveinvestigatedtheuseofhybridfiberreinforcementsinconcretetoexploittheuniqueadv