5-7 December 2018 - Hong Kong, China

CONFERENCE PAPERS

Ninth International Conference on Advances in Steel Structures (ICASS 2018)


A METHOD FOR THE TREATMENT OF 2ND ORDER EFFECTS IN PLASTICALLY-DESIGNED STEEL FRAMES

 

F. Walport 1*, L. Gardner 1 and D.A. Nethercot 1

1 Imperial College London, London, UK

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DOI:10.18057/ICASS2018.P.014

ABSTRACT:

The susceptibility of steel frames to global second order effects, also referred to as sway effects, ‘P–D’ effects and global geometric nonlinearities, is traditionally assessed through the elastic buckling load factor αcr. For elastic analysis, EN 1993-1-1 and other international steel design standards deem second order effects sufficiently small that they may be ignored if the amplification of internal forces and moments is no more than 10% of the original forces and moments, corresponding to a limit of αcr≥10. For plastic analysis, to reflect the influence of the degradation of material stiffness, a stricter limit of 15 is prescribed for second order effects to be neglected. Use of a single limit of 15 for any structural system no matter the degree of influence of plasticity is considered by the authors to be overly simplistic. A parametric investigation to assess the stability of steel frames in the plastic regime is presented herein. Based on the findings, an improved method is proposed for the treatment of global second order effects in plastically-designed steel frames.

Keywords:

Frame stability; Global analysis; Numerical modelling; Plastic design; Second order effects

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IMPORTANT DATES

First call for paper:
1 January 2018
Abstract submission: (CLOSED)
1 April 2018
Notification of abstract acceptance:
on or before 16 April 2018 
Full paper submission: 
15 July 2018
Online Registration Begins:
1 August 2018
Notification of full paper acceptance:
31 August 2018
Early bird registration:
on or before 7 September 2018
Online Registration Closes:
31 October 2018
Announcement of programme:
1 November 2018
ICASS2018 December 05, 2018 08:00 AM