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Steel and Composite Structures
  Volume 2, Number 1, February 2002 , pages 35-50
DOI: https://doi.org/10.12989/scs.2002.2.1.035
 


Welded plate and T-stub tests and implications on structural behvior of moment frames connections
P. Dong and T. Kilinski(USA)

 
Abstract
    A series of tests on simple-welded plate specimens (SWPS) and T-stub tension specimensrnsimulating some of the joint details in moment frame connections were conducted in this investigation. Therneffects of weld strength mismatch and weld metal toughness on structural behavior of these specimens werernconsidered under both static and dynamic loading conditions. Finite element analyses were performed byrntaking into account typical weld residual stress distributions and weld metal strength mismatch conditions tornfacilitate the interpretation of the test results. The major findings are as follows: (a) Sufficient specimen sizernrequirements are essential in simulating both load transfer and constraint conditions that are relevant tornmoment frame connections, (b) Weld residual stresses can significantly elevate stress triaxiality in addition tornstructural constraint effects, both of which can significantly reduce the plastic deformation capacity inrnmoment frame connections, (c) Based on the test results, dynamic loading within a loading rate of 0.02 in/in/rnsec, as used in this study, premature brittle fractures were not seen, although a significant elevation of the yieldrnstrength can be clearly observed. However, brittle fracture features can be clearly identified in T-stubrnspecimens in which severe constraint effects (stress triaxiality) are considered as the primary cause, (d) Basedrnon both the test and FEA results, T-stub specimens provide a reasonable representation of the joint conditionsrnin moment frame connections in simulating both complex load transfer mode and constraint conditions.
 
Key Words
    moment frame connections; finite element analysis; T-stub specimens; brittle fracture; stress triaxiality; residual stresses; joint constraint; weld strength mismatch.
 
Address
P. Dong and T. Kilinski, Center for Welded Structures Research, Battelle Memorial Institute, Columbus, OH 43201, USA
 

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