主管内填充混凝土矩形钢管桁架受力性能试验研究_刘永健.pdf

DO I :10.14006/j .j zj gxb.2009.06.014 30 6 2009 12 　JournalofBuildingStructures Vo.l30 No.6 Dec.2009 0 14 :1000 -6869 (2009 )06-0107 -06 刘永健, 刘君平, 杨根杰, 邓勇帮 (长安大学桥梁与隧道陕西省重点实验室, 陕西西安 7 10064 ) :,, β 0.8 、。: ,, , , 。, , 。,,。 , 。 :;;;; :U323.4　 U3 17.1　　:A Experimentalresearchonmechanicalbehaviorof RHStrusseswithconcrete-filledinchord LIUYongjian, LIUJunping, YANGGenji,eDENGYongbang (KeyLaboratoryforBridgeandunnelofShaanxiProvinc,eChang anUniversit,yXian710064, China) Abstrac:t oexaminetheeffectofmechanicalbehavioronrectangularhollowsection(RHS)steeltubetrusswiththe concrete-filledinchord,stestsonthreeRHSsteeltubulartrusseswithbranchandchordwidthratioβ=0.8 under staticpointloadingatmiddlespanwerecarried. hefirstspecmienwasaRHStrus,sthesecondonewasaRHStruss withconcrete-filledinthecompressionchord,sandthethirdonewasaRHStrusswithconcrete-filledinboth compressionandtensionchord.s hetestresultsshowthatthefailureofthethreetrussmodelsareduetothejoint failure, howeverthefailuremodesaredifferen.t heconcrete-filledinchordchangedthefailuremode, thefirstmodel isduetothecompressionchordwallyieldingwithsidewallbuckling, thesecondoneisduetothetensionchordwall yieldingwithsidewallbuckling, andthethirdoneisduetotheflangepunchingfailuremodeoftensilechordwall whichconnectedwiththetensilebranch. hedeflectionandstrengthofjointsdominatethewholetrussmechanical behavio.r heconcrete-filledinchordcannotonlyhelpreinforcedchordmember,sbutalsoenhancethestrengthand rigiditiesofjoint,sincreasingtheultimatebearingcapacityofthewholetrusse.sWhilethejointseccentricityislarger thanthelmiitsofspecification,sitseffectsshouldbeconsidered, andtheeffectsonmembersisobviously, witha greatereffectonchordsthanbranche.s hebearingcapacityoftestresultsislagerthan