Advanced Steel Construction

Vol. 13, No. 4, pp. 399-411 (2017)


EXPERIMENTAL STUDY ON STABILITY OF HIGH

STRENGTH STEEL LONG COLUMNS WITH

BOX-SECTIONS

 

Lei Gao, Kebin Jiang, Linyue Bai*and Qiang Wang

Army Engineering University of PLA, Nanjing 210007, China

*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)

Received: 13 June 2016; Revised: 12 January 2017; Accepted: 25 February 2017

  

DOI:10.18057/IJASC.2017.13.4.5

 

ABSTRACT:

Ten long columns made of high strength steel 18Mn2CrMoBA (nominal yield stress is 745 MPa) were employed in axial compression experiments to investigate their overall stability. The columns with thin-walled box-shaped cross-sections were first fabricated into channel shapes followed by welding. The initial geometrical imperfections of the specimens were measured, and the ratio of instability plane initial deflection to the member length was around 1/1000. The finite element model (FEM) which can introduce the influence of geometrical imperfection and residual stress was established. The results of numerical simulation were compared with the experimental results, and the results were in good agreement with the experimental results. Comparisons with Chinese GB50017-2003 specification indicated that the experimental values for the load bearing capacity were greater than that obtained from b-type column curves, but less than a-type column curves. The results were also close to b-type column curves, as defined in the European Eurocode3 steel structure design specification. However, the American ANSI/AISC 360-10 steel structure design specification overestimated the load capacity of this type of long column considered. Therefore, this paper recommends that the design of this type of long column employ the b-type curves specified by the GB50017-2003 or Eurocode3 specifications.

 

Keywords:

High strength steel, thin-walled box-shaped cross-sections, axial compression experiment, load bearing capacity, column curve

 

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