Advanced Steel Construction

Vol. 7, No. 4, pp. 344-358 (2011)


RESEARCH ON DISTRIBUTION AND MAGNITUDE OF INITIAL GEOMETRICAL IMPERFECTION AFFECTING STABILITY OF SUSPEN-DOME

 

Jiamin Guo

College of Ocean Environment and Engineering, Shanghai Maritime University, Shanghai 200135, China

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

 

Received: 17 February 2011; Revised: 22 March 2011; Accepted: 24 March 2011

DOI:10.18057/IJASC.2011.7.4.3

 

ABSTRACT:

Stability calculation is the main content during analysis of suspen-dome. To ensure the analysis results, with consideration initial geometrical imperfection, estimate structural stability reliably, looking for the worst distribution and magnitude of initial geometrical imperfection during stability calculation is the focus in this paper. First, a single-layer latticed shell and three types of suspen-domes are selected to study the influence of initial geometrical imperfection distribution on their overall stability by consistent imperfection mode method. Then, the influence of initial geometrical imperfection magnitude on structural stability was studied by the same method. Using calculation results from above numerical models, different distribution of initial geometrical imperfection, which is adopted during stability calculation, is listed, and the load-displacement curves which can reflect structural overall stability are drawn. Results show that the stability factor is lower when the first antisymmetric buckling mode is adopted as initial geometrical imperfection distribution and its magnitude lays between 1/500 and 1/300 structural span, and structural stiffness is also lower. The conclusions derived from the paper are applicable to similar practical structure.

 

Keywords:Suspen-dome, Initial geometrical imperfection, Buckling modes, Stability, Aberrance structure, Structural stiffness

 

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