| In recent years, due to light weight, high strength, ductility, and toughnessof steels and other continuous optimization and increase in steel production, steelstructure is widely used by high-rise buildings and industrial plants, especially inthe local of high level seismic fortification steel structure’s advantage ispronounced particularly. In steel structure, because the nodes are in state ofextremely complex stress and have a great impact on the overall structure, so thedesign of beam-column joint is extremely important.In traditional design of steel structure the node is assumed into full rigid orideal articulated, on1994the earthquake in Northridge California United States(Richter scale6.7level) and1995the earthquake in Osaka God Japan (Richterscale7.2level), the full welding connection and the tied-welding mixedconnection nodes in steel framework occurred brittle damage seriously, mainlyperformance in beam flange edge weld slope appeared crack. Through a largenumber of theoretical analysis and experimental study lots of improvementmethods on the steel structure nodes have been putted forward to prevent theoccurrence of brittle failure and to improve earthquake resistance capacity. Sosemi-rigid connections implemented in succession, it has better energyperformance and made up for the traditional lack of connection in terms ofseismic, so the study on semi-rigid connections of steel structure is a hot issues todomestic and foreign scholars.In this article as to classic semi-rigid connections in beam-columnconnection on top-seat angle and angle connection designed the ribs,experimented a research of hysteretic behavior on hysteretic behavior of beam-column joints. The destruction of the connector node form, ultimate bearingcapacity, low energy consumption, and the thickness of connectors have effectson nodes performance, conducting a analytical test on nodes joint compared withtraditional welding.Then through ANSYS finite element analysis to simulate the joint ofstructural member and to simulate hysteretic test which conditions consistentwith experimental conditions under low cyclic loads. Contrasts by finite element analysis with experimental results, it proved that finite element model can reflectthe actual test in the widget, mechanical characteristics, ultimate bearing capacity,failure mode and effective energy performance. Finally, in finite elementsimulation of the vertical limb of the connector, horizontal limbs, ribs plate bychanging the thickness of the variable parameters of the various properties of anode.The connection of beam-column joints has good strength and energydissipation properties. The hysteresis curve and damage patterns that ANSYSfinite element simulated are well coincided with test results. It showing that theANSYS finite element simulation method of the node connections is reliable.And vertical limbs, horizontal limbs and the degree of ribs thickness haveextremely important impact on the damage model of structure. The law ofhysteretic behavior of nodes that impacted by vertical limb, horizontal limbs andthe variation of rib thickness is from strong to weak. |
PDF Full Text Request