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Book ChapterDOI

Influence of Joint Panel Zone on Seismic Behaviour of Beam-to-Column Connections

TL;DR: In this article, the effect of strength of joint panel zone (JPZ) on the overall behavior of strong column weak beam interior beam-to-column strong axis connection is studied, to understand their contribution on the performance of such connections.
Abstract: Steel structures, because of their inherent ductility, are considered to be suitable for construction in areas of high seismicity. To ensure a certain expected performance of a structure, concept of strong column weak beam design was introduced and became widely accepted. Effect of strength of joint panel zone (JPZ) on the overall behaviour of strong column weak beam interior beam-to-column strong axis connection is studied, to understand their contribution on the performance of such connections. Three dimensional non-linear finite element analysis of three typical interior beam column joint subassemblages is carried out to study inelastic behaviour of such joints with different column to beam strength ratio. The results indicates that there is significant JPZ deformation leading to the kinking of columns beforeplastic hinges are formed in the beams even when the beams are weaker than the columns. This is due to inadequate shear strength of the JPZ. Also, excessive kinking in columns may lead to brittle failure of connections far before flexural capacity of beam is reached, thereby causing complete collapse of the structure.
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Proceedings ArticleDOI
18 May 2001

690 citations

Journal Article
TL;DR: In this article, the authors discuss the importance of joint shear in the response of frame structures to severe earthquakes and discuss the effects of high shear on the strength, stiffness, and energy-dissipation characteristics of frames.
Abstract: This paper discusses the importance of joint shear in the response of frame structures to severe earthquakes. Presently used AISC design criteria for joint shear are reviewed in the light of limited experimental evidence. The effects of high shear in joints on the strength, stiffness, and energy-dissipation characteristics of frames are discussed. The most important conclusions can be briefly summarized: Joints usually are very ductile elements capable of undergoing severe inelastic strain reversal without a decrease in strength. The shear force defined by the AISC design equation for combined gravity and lateral loads usually causes some inelastic deformation in joints. This is reduced when the allowable shear stress is modified by the factor alpha, which accounts for the effect of the axial force in the column on the yield stress in shear. Solutions for the ulimate shear strength, associated with controlled inelastic distortions, are given, for joints with unreinforced and reinforced webs, respectively. When joints are designed according to allowable stress criteria, inelastic deformations may be concentrated primarily in the joints and to a lesser degree in plastic hinge regions of beams and columns. Maximum strength and stiffness of frames is attained when all joints are designed for the maximum shear force that can be developed based on the strength capacity of the members framing into the joint. The need for this design criterion has not been fully established, although it is widely used in areas of high seismicity. If this criterion is used, the joints should be permitted to participate in energy dissipation through inelastic deformations. Joint distortions contribute significantly to the elastic story drift in frames. Equations are given which permit an estimate of the effect of these distortions on the lateral deflections.

250 citations

Book
01 May 1996
TL;DR: A state-of-the-art summary of recent developments in the behaviour, analysis and design of seismic resistant steel frames can be found in this paper, where the most recent results which can be used in the near future to improve the codified recommendations for steel structures in seismic zones.
Abstract: A state-of-the-art summary of recent developments in the behaviour, analysis and design of seismic resistant steel frames Much more than a simple background volume, it gives the most recent results which can be used in the near future to improve the codified recommendations for steel structures in seismic zones It contains new material which cann

197 citations