Study On Seismic Design Method And Dynamic Erformance Of Space Steel Pipe Truss Structure

The Steel Structure’s connection of Column-beam joint can be devided into rigidconnection node, ideal pin connection node and semi-rigid connection node. However,at High-rise Steel Structure building, the steel frame-support system is always used toincrease the structure’s lateral rigidity and bearing capacity, arrange the supportmember bar in part of the column and beam makes up the steel frame-support system.By means of the frame system and support system’s combined action, shaped thedouble resist side force structure system.From the two large earthquake, America’s1994Northridge earthquake andJapan’s1995Hyogon-Nanbu earthquake, we could found that large part of the steelstructure’s damage occurred on the column beam connection nodes. However, theColumn-beam connection node’s design is one of the most important section in thewhole structure’s design. Its reliability directly affect the structure’s overallperformance. After add the supports on the node, its surely affect the node area’sstress and strain’s distribution characteristics, rigidity and bearing capacity, even theearthquake resistant behavior. In this text using ANSYS finite element analysissoftware build two types node model, all welding rigid node with support or not anddouble web angle beam-column’s semirigidity node with support or not. Analyzed andcompared the support’s influention of stress and strain’s distribution characteristics,bearing capacity and the hysteresis behavior to the column-beam node area. Moreforward, also use shaft force on the beam, angle iron’s thickness, node domain’sthickness as the variation parameter, to have a parameter analysis, and obtain theconclusion:After the all welding rigid node and the double web angle beam-column’ssemirigidity node adding support, its have a little larger range’s increasment on thenode’s rigid and bearing capacity, transfer the plastic hinge effectively. But, at themeanwhile, under the cyclic reverse loading, the node’s stringiness have a bit ange’slower, and the hysteresis behavior and the energy dissipation capability have a smallrange’s drop.When the shaft force on the beam increase, the node’s rigidity and bearingcapacity decrease, the energy dissipation capability have a small drop, when the angleiron and gusset plate’s thickness increase, the node’s rigidity and bearing capacityincrease, meanwhile, the node’s stringiness have a small range drop.