Stress Performance Analysis Of Abnormal Joints With Different Types Of Cross-Sections Column In Rigid Steel Frame

The article based on the relevant experimental study has been completed by research group, researching on different types of variable cross-section column in rigid steel frame stress performance of abnormal joints by making a series of control parameters of the numerical simulation analysis.Firstly, the numerical simulation of test specimen with ABAQUS software, by comparing results of finite element analysis with experiment to verify the feasibility of the finite element analysis; Then, by changing the control parameters of the beam cross section type、column height ratio、axial compression ratio, to study these controls parameter influence on the stress performance of failure process、bearing capacity and stiffness degradation of H-section column of abnormal joints. Finally, in order to further study the stress performance of related to abnormal joints,then analyzing stress performance of the abnormal joints with variable cross-section box column.The research result shows that both hysteretic curve of H-section column of abnormal joints and box-section column of abnormal joints are plumper, these abnormal joints have strong ability to consume kinetic energy and their strength degradation are not obvious,which hawe a good seismic performance. By analyzing PEEQ diagram and the Mises stress nephogram, the first to yield areas of test specimenthe are in the column web of joint panel zonel;the section forms of beam has a significant effect on bearing capacity of H-section column of abnormal joints,but which has no significant effect on bearing capacity of box-section column of abnormal joints; the column height ratio in the range of 0.7-0.9, with the increase of column height ratio, components of yield displacement change is not obvious, but the yield load and ultimate bearing capacity increase with the increase of column height ratio; the axial compression ratio in the range of 0.2～0.6, with the increase of axial compression ratio,the yield displacement、 yield load、ultimate bearing capacity of node are declined; the trend of the stiffness degradation of all series of variable cross-section abnormal joints are basically the same, after the component achieve yield, stiffness deterioration is obvious at first, then the speed of stiffness degradation is slow, but the effects of the specimen stiffness degradation is not the same for the control parameters.