Research On The Seismic Behavior For Rigid Connections Of Round String- H Steel Beam

This paper choose welding mixed linked nodes. According the current specifications and procedures calculate and determine the sizes of research models. And use the software of ABAQUS to study the seismic performance of the round steel tube- H type steel beam rigidity connection point. According to the test results, through several seismic performance evaluation indexs like the hysteresis curves, skeleton curves, node ductility coefficient, strength degradation, stiffness degradation and energy dissipation capacity and so on, analysis of the influence law of seismic performance of the node carefully. The main research content has several parts:(1) Using ABAQUS finite element analysis software to three kinds of connection form of the nodes like the side column, the middle column and the angle column, the paper comparative studys the three nodes’ seismic performances under low reversed cyclic loading. Through the analysis, each index of the middle column is between in other two nodes and more secure. In the practical engineering application, the designer can reinforce the deficiency of different nodes in the form, in order to enhance the effect of the seismic performance of the node effectively.(2) By changing the axial compression ratio, apply static load and cycle load to study the influence of axial compression ratio on seismic performance of nodes, and verify whether the need to consider the influence of the axial pressure. Through the analysis, it is reasonable that specification of beam-column rigid connection does not consider the influence of the axial pressure in bearing capacity calculation formula. But the seismic performance of axial compression ratio on the node also have a certain influence, just less affected.(3) By changing the size of the outer ring plate width and thickness, and the size of arc radius, this paper studys the effect of various parameters on the seismic performance of the node. Through the analysis: Outer ring plate thickness increase can raise the bearing capacity and seismic performance of nodes. But after reach a certain degree, the seismic behavior of the nodes decreases continuously with the increase of outer ring plate thickness; The increase of the outer ring width can raise the bearing capacity and seismic performance of the node, and put forward some suggestions for this nodes design size that it’s better to choose the size of the outer ring plate width in the vicinity of 115- 135 mm, and choose the size of the outer ring plate arc radius in the vicinity of 455- 547 mm, and that will be safe and economic. So in the seismic design of the nodes, meet the node of carrying capacity at the same time, it’s better to choose the smaller ring plate thickness and width.