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Structural Engineering and Mechanics
  Volume 35, Number 6, August20 2010 , pages 699-715

Plastification procedure of laterally-loaded steel bars under a rising temperature
Zhan-fei Huang, Kang-hai Tan and George L. England

    This paper investigates the structural responses of axially restrained steel beams under fire conditions by a nonlinear finite element method. The axial restraint is represented by a linear elastic spring. Different parameters which include beam slenderness ratio, external load level and axial restraint ratio are investigated. The process of forming a mid-span plastic hinge at the mid-span under a rising temperature is studied. In line with forming a fully plastic hinge at mid-span, the response of a restrained beam under rising temperature can be divided into three stages, viz. no plastic hinge, hinge forming and rotating, and catenary action stage. During catenary action stage, the axial restraint pulls the heated beam and prevents it from failing. This study introduces definitions of beam limiting temperature Tlim, catenary temperature Tctn and warning time twn. Influences of slenderness ratio, load level and axial restraint ratio on Tlim, Tctn and twn are examined.
Key Words
    steel; fire; numerical analysis; axial restraint; limiting temperature; catenary action.
Zhan-fei Huang: AECOM Singapore Pte Ltd., BLK. 289G, Bukit Batok St. 25, #07-108, Singapore 656289
Kang-hai Tan: School of Civil & Environmental Engineering, Nanyang Technological University, Singapore 639798
George L. England: Department of Civil Engineering, Imperial College, Imperial College Road, London SW7 2BU, United Kingdom

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