DOI: 10.15986/j.1006-7930.2018.01.004
以圆钢管混凝土K型焊接相贯节点的试验研究为基础,利用试验的相关参数,对该种节点进行了非线性有限元参数分析,以研究这种节点的破坏模式及其应力分布规律.分析中考察了弦杆径厚比γ、腹杆与弦杆管径比β和壁厚比τ等参数对节点承载力、破坏模式以及承载效率的影响规律.分析结果表明:圆钢管混凝土K型焊接相贯节点的承载力、承载效率和破坏模式三者相互关联.当节点发生腹杆失效破坏时,β和τ值对节点极限承载力的影响较大,而γ值的影响很小; 在此破坏模式下,节点的承载效率均接近于1.当节点发生冲剪开裂破坏时,γ和β值对节点极限承载力的影响较大,而τ值的影响很小.然而,在此破坏模式下,τ值对节点承载效率的影响较大.另外,对圆钢管混凝土K型焊接相贯节点的承载力计算方法进行了探讨,本文研究成果可为工程实践提供理论依据.
Based on the experimental study of concrete-filled circular steel tubular(CFCST)welded K-joints, the finite element analyses were carriedout using related test parameters to reveal the failure modes and stress distribution laws of this kind of joint. The effects of the chord member diameter-thickness γ, the diameter ratio β and thickness ratio τ between the chord member and the web member on the ultimate bearing capacities, failure modes and load-carrying efficiencies were studied. Results indicate that the bearing capacity, carrying efficiency and the failure mode are correlated for this welded CFCST K-joints. When the web member fails, the β and τ have large effect on the bearing capacities compared with the γ. Under this condition the load-carrying efficiencies of joints are all close to 1. When the joint fails because of the chord member punching shear, the β and γ have larger effect on the bearing capacities compared with the τ. However under such condition, the τ has largest influence on the carrying efficiencies. Finally the bearing capacity calculation method of the CFCST welded K-joint was studied and the results can provide theoretical basis for engineering practice.
