圆钢管混凝土K型焊接管板节点试验研究和有限元分析

发布时间：2018-11-01 21:07

【摘要】：以组成K型焊接管板节点的塔柱径厚比γ、腹杆与塔柱管径比β和壁厚比τ,节点板厚度与腹杆壁厚比t_g/t_i为参数,对4个圆钢管混凝土K型焊接管板节点和1个空心圆钢管K型焊接管板节点进行试验,研究该类型节点的破坏模式、承载能力以及节点区的受力特点,并采用有限元方法分析各参数对圆钢管混凝土K型焊接管板节点受力性能的影响规律。研究结果表明:随着所取参数的变化,圆钢管混凝土K型焊接管板节点存在腹杆失效和节点板失效2种破坏模式;而空心圆钢管K型焊接管板节点的破坏模式为塔柱管壁过度塑性变形失效。说明钢管中混凝土的填充改变了节点的受力特点和破坏模式,有利于材料承载能力的充分发挥。节点板厚度与腹杆壁厚比t_g/t_i是影响圆钢管混凝土K型焊接管板节点破坏模式和极限承载力的关键因素。在实际工程中,为避免出现节点失效,t_g/t_i的取值宜大于2。
[Abstract]:The parameters of K type welded tube-plate joints are as follows: diameter to thickness ratio 纬, diameter ratio 尾 to column diameter 尾 and wall thickness ratio 蟿, thickness of joint plate to wall thickness ratio t_g/t_i. In this paper, the failure mode, bearing capacity and stress characteristics of four joints with concrete filled circular steel tube (CFST) K type welded pipe plate and one hollow circular steel tube K-type welded tube-plate joints are studied. The finite element method is used to analyze the influence of various parameters on the mechanical behavior of the welded tubular plate joints with circular concrete-filled steel tube (CFST). The results show that: with the change of parameters, there are two failure modes: web member failure and joint plate failure; The failure mode of K-type welded tubular joints of hollow circular steel tubes is the failure of excessive plastic deformation of column walls. It is shown that the filling of concrete in steel tube changes the stress characteristics and failure mode of the joints, which is beneficial to the full exertion of the bearing capacity of the material. T_g/t_i is the key factor that affects the failure mode and ultimate bearing capacity of the joints of circular concrete-filled steel tube (CFST) K-welded tube-plate joints. In practice, in order to avoid node failure, the value of t_g/t_i should be more than 2. 5%.
【作者单位】：南京航空航天大学航空宇航学院;内蒙古科技大学土木工程学院;
【基金】：国家自然科学基金资助项目(51068021,11172131) 内蒙古自然科学基金资助项目(2012MS0711)~~
【分类号】：TU398.9

【参考文献】