5-7 December 2018 - Hong Kong, China

CONFERENCE PAPERS

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


ULTIMATE AND NOMINAL STRENGTH ANALYSIS OF COMPOSITE SECTIONS WITH ARBITRARY SHAPE

 

Cosmin G. Chiorean 1*, Stefan M. Buru1

1 Department of Structural Mechanics, Technical University of Cluj-Napoca, Cluj-Napoca, Romania

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DOI:10.18057/ICASS2018.P.140

ABSTRACT:

This paper presents a new computational method for ultimate strength analysis of composite steel-concrete cross-sections with arbitrary shape. The ultimate (maximum) strength capacity is formulated as a problem of unconstrained mathematical optimization by applying the method of Lagrange multipliers. The optimized function is defined as a total internal bending moment and two constrains are defined by enforcing the constant axial force and bending moment ratio. Hence, the ultimate bending moment capacities are directly obtained by solving three coupled nonlinear equations. This procedure adopts a tangent stiffness strategy for the solution of the nonlinear system of equations thus resulting in a high rate of convergence. The developed procedure has been used to predict the bending moment capacity diagrams of several cross-sections and the differences between the ultimate and nominal strength capacities of cross-sections are highlighted. The strain-softening effect exhibited by the concrete in compression is discussed in this respect and the comparisons made prove the effectiveness and the reliability of the proposed method of analysis.

Keywords:

Ultimate strength capacity; Nominal strength capacity; Composite steel-concrete cross-section; Bi-axial bending; Strain-Softening.

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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