Study On Stablity Of Beams And Columns Of Steel Frames With RBS Connections

Reduce beam section(RBS) connection through the beam flange local weaken, forcing the plastic hinge under earthquake vulnerability of the connections off the weld area, the relocation of the plastic hinge to achieve the purpose, thereby reducing the possibility of brittle failure of the connection, the connection increases ductility. However, connections with greater dog bone plastic rotation capacity, will inevitably weaken the stiffness of the whole structure, and thus steel frame beams and columns of a certain impact on the overall stability.Reduce beam section(RBS) connection, the overall stability of steel beams is analyzed. RBS is derived using the energy method in the pure bending beam loads the overall stability of the beam. By introducing the equivalent stiffness, will weaken the part of the stiffness of flange beams of equivalent stiffness method for analysis, Reduce beam section (RBS) connection, the critical buckling load of steel beam and steel beam of the critical load and general comparison analysis.Usually at this stage the overall stability of plane steel frame is simplified as to analyze the stability of columns, column in the design of the framework, the widespread adoption of effective length method, this paper considers the basis of reduced flange RBS connection negative impact on the frame beam, by bending strain energy is equal to derive the equivalent linear stiffness of the frame beam is obtained and no lateral instability of sway RBS frame when the length of column coefficients.Based on the framework of the beam cross-section values, length of column in the framework of the theory and characteristics of the introduction of the RBS connection parameters deduced beam and column stability in the whole formula, by changing the beam span and reduce the distance segment starting point, weaken the length, reduced depth, establishment of three series of examples, are arc-shaped dog bone design parameters of the corresponding connection of steel beam, column stability capacity of the law. This paper analyzes the results show that RBS connections with the weakening parameter changes, the frame beam and column stability of the overall project will exceed the allowable error, so weaken the parameters should be considered adverse effects.