International journal of steel structures (국제강구조저널)

Korean Society of Steel Construction (한국강구조학회)
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Finite Element Investigation on Deflection of Cellular Beams with Various Configurations

  • Published : 2013.09.30
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Abstract

The effect of the cellular beam configuration on the deflection has been investigated by using the three-dimensional finite element analysis of 408 cellular beams. Cross-section dimension, beam slenderness, opening size and opening spacing are found to affect the stiffness of the analytical load-deflection curve. The parametric study of the FE stiffness and normalized stiffness is conducted. The stress distribution of the finite element (FE) model reveals the strut stress in the web-post contributes to the increasing deflection in addition to the regular bending deflection. The deformation of the web-post and the relative movement between the upper and lower tee-sections due to strut stress is the main reason of the additional deflection in the cellular beams. The effect of the strut stress is found to be significant for the deflection of the short-span beams but less for the long-span beams. To convert the theoretical bending deflection to be the overall deflection, the calibrating coefficient function is established by using the empirical study. The function is formulated in terms of the slenderness, spacing and cross section ratio. The deflection prediction is useful to check serviceability condition for the design purpose.

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References

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