American Society of Civil Engineers


Buckling Behavior of Shell Elements Subjected to Inelastic Reversed Cyclic Loading


by Max Stephens, (Graduate Research Assistant, Dept. of Civil and Environmental, Portland State University, PO Box 751 CEE, Portland, OR 97207-0751. E-mail: mts@pdx.edu), Peter Dusicka, (Associate Professor, Dept. of Civil and Environmental, Portland State University, PO Box 751 CEE, Portland, OR 97207-0751. E-mail: dusicka@pdx.edu), and Gregory Lewis, (Graduate Research Assistant, Dept. of Civil and Environmental, Portland State University, PO Box 751 CEE, Portland, OR 97207-0751. E-mail: gregorylewis3200@gmail.com)
Section: Posters, pp. 3080-3091, (doi:  http://dx.doi.org/10.1061/41171(401)268)

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Document type: Conference Proceeding Paper
Part of: Structures Congress 2011
Abstract: Shell elements are commonly used over continuum 3D elements to model structural components for computational efficiency when information regarding behavior across the material thickness is not needed. Shell elements are widely believed to effectively capture the global hysteretic behavior of thin walled structural components. The objective of this research was to compare the hysteretic behavior of numerical models of links, such as those used in eccentrically braced frames that consisted entirely of shell and of continuum elements. The geometry, material properties, and loading protocol were consistent in the shell and 3D continuum analyses. The results captured by the shell-based models exhibited significantly more severe global degradation of the force deformation hysteresis at large inelastic deformations then the 3D continuum elements. This discrepancy was recorded for models of entire links as well as more simplified models. The results of this investigation have brought into question the reliability of shell elements in accurately capturing the buckling behavior of thin walled structural components subjected to extreme cyclic loading.


ASCE Subject Headings:
Buckling
Inelasticity
Cyclic loads
Shells