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The Optimum Research of Beam-Column-Joinconnection of the Steel Structure

Author: WangFen
Tutor: GaoDuiXian
School: Xi'an University of Technology
Course: Structural Engineering
Keywords: Steel frame structure Node optimization method Dog -bone node The flange strengthen dog bone node Seismic performance
CLC: TU391
Type: Master's thesis
Year: 2007
Downloads: 403
Quote: 1
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Abstract


With the steady development of the economy, steel its special properties can be widely used. However, in the 1994 Northridge earthquake and the 1995 Kobe earthquake in Japan, as well as steel construction accidents in the construction process, once thought to be good seismic performance of steel frame beam-column connections found a lot of brittle fracture phenomenon. Steel frame beam-column connection performance and its impact on the seismic performance of steel frame structures after the earthquake a lot of research. Steel frame beam-to-column connection rigid connection design, the main beam and column connections have sufficient stiffness. Steel beam-column joints in accordance with the connection method can be divided into: welding nodes, the nodes connected and bolted and welded mixed connection node. Firstly, from a design point of view, three kinds of commonly used design of the beam-column joints, pointed out the Liangzhu Gang connection node design problems in its correct design method. Secondly, elaborated to optimize the design through the use of dog-bone form of beam-column joints of steel frame beam-column joints. ANSYS finite element program 18 different parameters of the weakening of the operation of the node model, carried two loads comparative analysis of the mechanical properties. Summed up the maximum stress under load when the beam flange weakened, and weaken the position and size of the design reasonable, the node will appear in a large plastic deformation of the beam flange weakened parts, from the most likely to occur in many practical engineering brittle fracture at the beam-column joints connected, to increase the ductility of the structure through the design. In-depth discussion of the reasonable position and size of the dog bone node weakened. Again, compare to strengthen the connection type, the dog-bone connection flange enhanced mechanical properties of dog-bone connection, pointing out that their design calculation methods. The elastic, elastic-plastic finite element analysis based on the carrying capacity of comparative analysis, dog bone node node and flange enhanced dog bone, the results showed that: flange enhanced dog bone node design can weld flange beams and columns plastic hinge effectively transferred to plastic good base metal region, to avoid the formation of plastic hinges in the the weak weld root site, to protect the poor toughness of the weld. Loads, flange enhance the the node carrying capacity of dog bone better than a dog bone node. Finally, according to the results of the analysis of the above study, the commonly used rigid connection node practice, in terms of seismic performance for an evaluation, economic, reasonable, practical node form and construction proposals.

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