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1、2017年第2期混凝土与水泥制品2017No.22月CHINACONCRETEANDCEMENTPRODUCTSFebruary薄壁方钢管混凝土柱-空心钢管梁节点单调加载试验研究张兆强,姚勇,吴先哲（西南科技大学土木工程与建筑学院,绵阳621010）摘要:以轴压比为主要考察参数,对6个1∶1足尺模型的薄壁方钢管混凝土梁柱节点进行了单调加载试验。试验观察了受力过程和破坏形态,得到了梁端荷载-位移曲线,并分析了节点的刚度、承载力和延性等重要指标。结果表明,试件节点均经历了弹性、梁局部屈服、塑性、破坏等阶段,直焊型节点的破坏主要是由梁局部屈曲及柱棱角处拉裂引起,螺
2、栓节点的破坏主要是由于梁与柱贴板间焊缝开裂引起,加腋节点中加腋板显著增强了节点域刚度,塑性铰形成于梁上并远离节点区域,其破坏主要由梁局部屈曲引起,节点域完好,较好地满足了“强柱弱梁、节点更强”的抗震设计目标；采用螺栓贯穿连接措施对节点初始刚度影响不大,而采用加腋手段对节点初始刚度提高显著；加腋和螺栓贯穿连接措施均能较大地提高节点的承载力；随着轴压比的增大,试件极限承载力有一定小幅降低,而试件延性下降明显。关键词:薄壁方钢管混凝土柱；梁柱节点；单调加载；承载性能；试验研究Abstract：Consideringaxialcompressionratioasth
3、emainparameter,thetestsonsixfull-scalemodelsofjointsbetweenconcrete-filledthin-walledsquaresteeltubularcolumnsandhollowsteeltubularbeamswerecarriedoutundermonotonicloading.Theloadingprocessandthefailuremodeswereobserved,andtheload-displacementcurvesofbeam-endswereobtained.Basedonth
4、eexperimentalresults,themechanicalpropertiesofthejointssuchasthestiffness,bearingcapacityandductilitywereanalyzed.Theresultsshowthatallthejointshaveexperiencedstagessuchaselasticity,localyieldofbeam,plasticityanddestruction.Thedamageofdirectlyweldedjointsismainlycausedbythelocalbuc
5、klingofbeamandpullcrackofcornerangleofcolumns,andthedamageofboltonesismainlycausedbyweldcrackofcolumnandbeam.Forhaunchedjoints,thestiffnessissignificantlystrengthenedbythehaunchedplate,thefailureofjointsiscausedbythelocalbucklingofbeam,theplastichingeappearsatthebeamwhereisawayfrom
6、theconnection,andthecoreofjointisundamaged.Thiskindofjointsbettermeetstheseismicdesignprinciples,including"strongcolumnandweakbeam,strongernodes".Themethodofboltconnectionhaslittleinfluenceontheinitialstiffnessofthejoints,whilethemethodofhaunchinghassignificantlyimprovedtheinitials
7、tiffnessofthejoints.Bothofthemethodscansignificantlyimprovethebearingcapacityofthejoints.Withtheincreaseoftheaxialcompressionratio,theultimatebearingcapacityofthespecimensisreducedslightly,whiletheductilityisdecreasedobviously.Keywords:Concrete-filledthin-walledsquaresteelcolumn;Be
8、am-columnjoint;Monotoniclo
