CAJ | 학술논문

为研究外接式钢桁－槽型梁组合桁架节点的受力性能、破坏模式以及极限承载力，对缩尺比例为1∶3的节点模型进行单调水平静力加载实验。介绍节点的模型设计、加载过程和测点布置情况；利用混凝土上弦杆自由端中点测得的位移绘出荷载－位移曲线得出外接式节点的极限承载力；同时对比各部件有限元分析结果，找出节点试验的薄弱部分，并提出相应的改进意见。研究结果表明：节点承载力较高，PBL剪力键传力效果明显；在不改变原缩尺比例的情况下通过在钢腹杆内增加12 mm厚的加劲肋能有效提高腹杆稳定性与节点极限承载力。研究成果可为以后实际工程设计以及理论研究提供帮助。
위연구외접식강항－조형량조합항가절점적수력성능、파배모식이급겁한승재력，대축척비례위1∶3적절점모형진행단조수평정력가재실험。개소절점적모형설계、가재과정화측점포치정황；이용혼응토상현간자유단중점측득적위이회출하재－위이곡선득출외접식절점적겁한승재력；동시대비각부건유한원분석결과，조출절점시험적박약부분，병제출상응적개진의견。연구결과표명：절점승재력교고，PBL전력건전력효과명현；재불개변원축척비례적정황하통과재강복간내증가12 mm후적가경륵능유효제고복간은정성여절점겁한승재력。연구성과가위이후실제공정설계이급이론연구제공방조。
To research the mechanical behavior,failure mode and ultimate bearing capacity of steel truss-trough girder composite truss joints,the monotonous static horizontal load was applied to the model gradually whose re-duced-scale was 1∶3 .The design of model,loading process and arrangements of measuring points were de-scribed in the first part of the thesis.The ultimate bearing capacity of the external node was calculated by analy-zing the load-displacement curve of the free terminal of the concrete chord midpoint obtained by the measured displacement.Simultaneously,the aim is to find out the weak part of the node by contrasting the results obtained from the finite element analysis and propose appropriate improvements.The results indicate that the bearing ca-pacity of node can meet the requirement of bearing capacity,and the PBL connector holds a good capability to transmit force.When the reduced-scale remains unchanged,adding a 12 -millimeter-thick stiffener can ef-fectively improve the stability of the belly bar and the ultimate bearing capacity of the node.The research results can provide help for the later theoretical research and practical engineering design.