CAJ | 학술논문

通过多组缩尺比例为1∶3的外接式钢—混凝土组合桁架与钢桁—槽型梁组合结构的单调静力试验，研究节点在加载过程中的失效模式、极限承载力和破坏机理。研究结果表明：外接式钢－混凝土组合桁架破坏模式有混凝土开裂，节点板受压部位局部屈曲，螺栓滑移，节点板被拉断，混凝土与节点板接触面应力集中；钢桁－槽型梁组合结构破坏模式有腹杆失稳破坏，混凝土与节点板接触面应力集中；腹杆加固后钢桁－槽型梁组合结构破坏模式有螺栓滑移，节点板被拉断，混凝土与节点板接触面应力集中。应用有限元软件 ABAQUS 对各节点进行模拟分析，试验与模拟分析均表明：增加混凝土高度以及节点板尺寸的钢桁－槽型梁组合结构承载力要明显高于节点部位尺寸较小的外接式钢－混凝土组合桁架，在整体尺寸不变的情况下，可通过改变各部件所占整体的刚度比来达到控制节点破坏模式的目的。
통과다조축척비례위1∶3적외접식강—혼응토조합항가여강항—조형량조합결구적단조정력시험，연구절점재가재과정중적실효모식、겁한승재력화파배궤리。연구결과표명：외접식강－혼응토조합항가파배모식유혼응토개렬，절점판수압부위국부굴곡，라전활이，절점판피랍단，혼응토여절점판접촉면응력집중；강항－조형량조합결구파배모식유복간실은파배，혼응토여절점판접촉면응력집중；복간가고후강항－조형량조합결구파배모식유라전활이，절점판피랍단，혼응토여절점판접촉면응력집중。응용유한원연건 ABAQUS 대각절점진행모의분석，시험여모의분석균표명：증가혼응토고도이급절점판척촌적강항－조형량조합결구승재력요명현고우절점부위척촌교소적외접식강－혼응토조합항가，재정체척촌불변적정황하，가통과개변각부건소점정체적강도비래체도공제절점파배모식적목적。
A static experiment was done on multi -group steel -concrete composite truss joints and steel truss -groove beam composite structure whose proportions are 1∶3 to study the modes of failure,ultimate bearing capaci-ty and failure mechanism of the two composite truss joint.The results show that the failure mode of the external steel -concrete composite truss includes concrete cracking,the bucking deformation at pressed part of gusset plate,high strength bolt slippage,gusset plate to be ruptured and stress focusing on the interface of concrete -chord with gusset plate.The failure mode of steel truss -groove beam composite structure involves web member unstable failure,stress focusing on the interface of concrete -chord with gusset plate.The failure mode of rein-forced steel truss -groove beam composite structure comprises high strength bolt slippage,gusset plate to be rup-tured and stress focusing on the interface of concrete -chord with gusset plate.The finite element software ABAQUS was applied to simulate each node,the test and simulation analysis show that the bearing capacity of steel truss -trough girder composite truss joints with larger height and size of gusset plate is significantly superior to that of external steel -concrete composite truss.Under the same content of overall dimensions,we can control failure mode by changing the stiffness ratio of each part.