Design of biaxially loaded short composite columns of arbitrary section

Citation
Sf. Chen et al., Design of biaxially loaded short composite columns of arbitrary section, J STRUC ENG, 127(6), 2001, pp. 678-685
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Civil Engineering
Journal title
JOURNAL OF STRUCTURAL ENGINEERING-ASCE
ISSN journal
0733-9445 → ACNP
Volume
127
Issue
6
Year of publication
2001
Pages
678 - 685
Database
ISI
SICI code
0733-9445(200106)127:6<678:DOBLSC>2.0.ZU;2-D
Abstract
In this paper, an iterative quasi-Newton procedure based on the Regula-Fals i numerical scheme is proposed for the rapid sectional analysis and design of short concrete-encased composite columns of arbitrary cross section subj ected to biaxial bending. The stress resultants of the concrete are evaluat ed by integrating the concrete stress-strain curve over the compression zon e. Exact integral expressions of the stress resultants for both polygonal a nd circular subsections are derived, and these are used to achieve an effic ient and accurate analysis. The stress resultants of the encased structural steel and the steel reinforcing bars are obtained using the fiber element method. A particularly important feature of the present method is the use o f the plastic centroidal axes of the cross section as the reference axes of loading in the iterative solution process. This ensures the convergence of the solution process for all cross-sectional conditions. Numerical example s are presented to demonstrate the validity, accuracy, and capability of th e proposed method.