Design And Engineering Application Of RBS Connections In Steel Frame

Reduced beam section (RBS) conection, with the weakening of beam flange,forced the plastic hinge under earthquake off the vulnerability of the weld area.It canmake the plastic hinge away from the beam and column interface, reduce thepossibility of brittle failure and impove ductility of the structure. However, reducedbeam section (RBS) conection with greater plastic rotation capacity, will inevitablyweaken element stiffness matrix and the stiffness of the whole structure and will alsoaffect the steel beam and column stability to some extent. The main topic of this paperis carried out around the new RBS connection. It focuses on solving the steelframework with RBS connection in the actual engineering design. Due to theweakening of beam flange, it can weaken the connection parameters, reduce theinternal force stiffness as well as beam and column stability. A steel framework designexample of RBS connection is designed and analysed. In this paper, the main researchwork as follows:(1) Aiming at the design principles of RBS connection,the weakening of theconnection parameters and the corresponding principle, combining the connectiondesign principles of code-strong column and weak beam, the strong connection andweak component, the connection domain and the corresponding seismic structuralmeasures, the design of steel framework with RBS connection is studied in thisarticle.(2) The element stiffness matrix of RBS connection is studied in this article. Theelement matrix stiffness of the RBS connection is smaller than the ordinaryconnection, but the degree is different. The axial force is minimal, shearing force isthe second and bending moment is the largest.Through the comparison of the sixgroups of different spans in the steel framework, we can summarize the internal forcewith the increase of span is different. Through the comparison of the internal forcebetween RBS connection and common connection, we can summarize the differencewith the increase of span showes a decreasing trend. (3) The beams and columns stability of RBS connection is studied in this article.Through the comparison of length factor of the two different connections, we can findcolumns stability can not be ignoredelement. Such adverse effects should beconsidered in the actual engineering design. Through the comparison of CriticalMoment of the two different connections, we can also know beam stability can not beignoredelement; at the same time, the critical moment of the RBS connection beamunder different loads are different. the critical moment under pure bending loads islargest, the one under concentrated loads is the second and bending moment under theuniformly distributed loads is the smallest. For security reasons, critical momentformula under uniformly distributed loads can be used in practical engineeringchecking for the stability of beam.(4) Aiming at a steel framework design example of RBS connection,8degreeearthquake and RBS connection, the design of RBS connection and beam-columnstability is designed.