X型方钢管相贯节点抗弯刚度的影响因素

Influencing factor of flexural rigidity of X-joints made of square hollow sections

分析相贯节点几何参数对刚度的影响,有助于了解相贯节点的抗弯机理。以X型方钢管相贯节点为研究对象,利用ANSYS有限元软件,通过节点弯矩-转角曲线分析相贯节点支管与主管宽度比β、主管宽厚比γ以及支管与主管厚度比τ对平面内抗弯刚度的影响。结果表明:γ和τ一定时,节点抗弯刚度随着β的增加逐渐增大,在线性段增加幅度较大;τ和β一定时,节点抗弯刚度随着γ的降低而增大,在线性段增加明显;γ和β一定时,随着τ的变化,节点抗弯刚度基本不变。影响节点抗弯刚度的主要几何参数是β和γ,τ的影响不显著,但随着β的增加,τ的影响有所提高。

Analysis of the effect of geometry parameters on the stiffness of tubular joints may shed light on the flexural rigidity mechanism.Based on the finite element software ANSYS,this paper presents an analysis of the flexural rigidity of X-type tubular joints influenced by the width ratio between the main and branch tubes β,the width-thickness ratio of the main tube γ and the thickness ratio of the branch and main tubes τ,through moment-rotation curves.The results show that： at fixed γ and τ,the flexural rigidity shows a gradual increase,depending on increasing β,accompanied by a greater increase at the liner stage.At fixed τ and β,the flexural rigidity tends to increase with decreasing γ and shows an obvious increases at the liner stage.At fixed γ and β,the flexural rigidity stays constant with different τ.The main geometric parameters influencing node flexural rigidity are β and γ,followed by τ exerting less significant impact which tends to become stronger due to the increasing β.