东南大学学报（英文版）2023，Vol.39Issue(3)：269-276,8.DOI:10.3969/j.issn.1003-7985.2023.03.007
疲劳荷载作用后钢混凝土组合外接式节点静载性能试验研究
Experimental study on the static load performance of steel-concrete composite external joints after fatigue loading
摘要
Abstract
To study the effect of fatigue loading on the static performance of the external joint of the steel truss web-concrete composite (STWCC) structure, three joint models were designed and constructed with a scale ratio of 1 :3. The failure mode and load-displacement curve of the joint were obtained through static load testing and post-fatigue static load testing. The load-strain curve of the gusset plate was plotted. The changes in mechanical performance indexes, such as the yield load, ultimate load, rigidity, and ductility coefficient of the joint, were comprehensively analyzed. The results showed that the gusset plate was the key load-bearing component of the STWCC joint, and gusset plate failure was the typical failure mode of the external joint. Although fatigue load had a minor impact on the mechanical performance of the joint before yielding, it exerted a remarkable impact post yielding. Compared with the specimen subjected to only static loading, the specimen without fatigue failure exhibited a 4％ lower ultimate bearing capacity and a 28％ lower ductility coefficient, while the specimen with fatigue failure exhibited a 25％ lower ultimate bearing capacity and a 52％ lower ductility coefficient. Fatigue cracks induced stress redistribution in the gusset plate and increased the strain in the regions without fatigue cracks. The strain increase rate decreased with increasing distance from the fatigue cracks.关键词
钢桁腹混凝土组合结构/组合外接式节点/模型试验/疲劳后静载/受力性能Key words
steel truss web-concrete composite structure/composite external joints/model test/static load after fatigue/mechanical performance分类
交通工程引用本文复制引用
谭映梁,祝兵,崔圣爱..疲劳荷载作用后钢混凝土组合外接式节点静载性能试验研究[J].东南大学学报（英文版）,2023,39(3):269-276,8.基金项目
The National Natural Science Foundation of China(No.U1834207). （No.U1834207）
