论文部分内容阅读
用ANSYS有限元分析方法分析了树状结构空间四分叉铸钢节点在弯矩作用下的塑性区扩展过程及几何因素对抗弯极限承载力的影响,并在此基础上拟合出该类节点的抗弯极限承载力公式.结果表明:在弯矩作用下,节点首先在相邻分管相交界限处进入塑性,此后分管受拉较大一侧靠近节点核心区的部位进入塑性,两处塑性区随荷载增大而扩展,最终相互连接,节点核心区屈服,达到承载力极限;主分管之间夹角对节点抗弯极限承载力的影响不大,但主管径厚比对节点抗弯极限承载力的影响较大;节点承载力随分管与主管壁厚比的增大呈近乎线性增大;节点抗弯极限承载力随分管与主管外径比的增大而增大;承载力随主分管倒角半径的增大而增大,随分管外壁倒角半径的增大而增大,随分管内壁倒角半径的增大而先增大后减小.
ANSYS finite element analysis method was used to analyze the influence of the plastic zone expansion process and the geometric factors on the ultimate capacity of buckling of the four-pitch cast steel node of tree structure space under bending moment. On the basis of this, The results show that under the action of bending moment, the node first enters the plasticity at the boundary of the adjacent pipe intersections, and then enters the plastic near the core of the node where the tension is greater, and the two plasticities Area increases as the load increases, and finally connects with each other. The core area of the node yields and reaches the ultimate bearing capacity. The angle between the main branch has little effect on the ultimate bearing capacity of the joint, The bearing capacity of the joint increases with the increase of the ratio of wall thickness to wall thickness, and the ultimate bearing capacity of the joint increases with the increase of the ratio of the outer diameter to the outer diameter of the joint. The increase of the chamfering radius increases with the increase of the radius of chamfering the outer wall and increases with the increase of the chamfering radius of the inner wall and then increases first and then decreases.