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Adeli, H. and Fiedorek, J.

Interactive Computer-Aided Design of Welded and Bolted Connections in Steel Buildings

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Series: w78:1986 (browse)
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Jörg Hildebrand, Idna Starcevic, Frank Werner, Heinz Heinemann and Günter Köhler

Numerical Simulation Of Tig-Dressing Of Welded Joints

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Full text: content.pdf (2,178,206 bytes) (available to registered users only)

Series: w78:2006 (browse)
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Mahmoud K M

Fracture behavior of welded steel bridge components

Abstract: This paper presents the investigation of fracture behavior of welded steel bridge components. The interaction between a macroscopic crack and continuously distributed microscopic damage in a power-law hardening material is studied by accounting for void accumulation in the vicinity of the crack-tip. The damage is assumed to be concentrated to a small circular zone centered at the crack-tip, where growth and coalescence of microvoids are invoked. A component, loaded in Mode-I under plane strain condition, is considered. The deformation theory of plasticity is employed to obtain the stress, strain and displacement fields ahead of the tip of the crack, where a damage variable, D, is introduced to describe the mechanical effect of distributed microscopic damage. Only isotropic damage is considered in this paper. For monotonic loading, the external applied stress for small-scale and large-scale yielding solutions is found to be proportional to a0 -1/ (n+1), where a0 is half the initial crack length and n is the strain-hardening exponent of the material. This reduces to Griffith's classical result for elastic material. For fatigue crack propagation under small-scale yielding, the effects of initial crack size, final crack size and the cyclic stress level on the service life of welded steel bridge components are assessed and found to be in good agreement with Paris power-law for fatigue crack growth.

Keywords: fracture behavior, bridge components, damage mechanics, microvoids, Mode-I, HRR singularity

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Full text: content.pdf (914,147 bytes) (available to registered users only)

Series: itaec:2003 (browse)
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Markku Heinisuo, Marko Saikkonen, Jaakko Haapio, John Miles

Welded steel beam design using particle swarm analysis

Abstract: The paper looks at the design of welded steel beams for a typical structure which contains both primary and secondary beams. The underlying theory is fully explained. Also the stress limits and other constraints are defined using practical limits which are defined in Eurocodes. The derived method is only approximate and suitable for early design. In order to give a means of assessing the suitability of PSO for solving the chosen problem, some exact solu-tions are first calculated using exhaustive search. These are then used to show that a simple PSO approach gives unsat-isfactory results and that it is necessary instead to use a layered algorithm.

Keywords: design, welded, steel, beam, particle swarm, constraints

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Full text: content.pdf (192,080 bytes) (available to registered users only)

Series: w78:2007 (browse)
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