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Experimental Verification of Eccentrically Loaded Steel Joist Analysis with Nonsymmetric Sections
| 题名： | Experimental Verification of Eccentrically Loaded Steel Joist Analysis with Nonsymmetric Sections |
| 正文语种： | eng |
| 作者： | Edward J. Sippel;Ronald D. Ziemian;Hannah B. Blum |
| 作者单位： | Univ. of Wisconsin–Madison;Bucknell Univ.;Univ. of Wisconsin–Madison |
| 摘要： | Abstract The nonsymmetric sections commonly found in open-web steel joists present difficulties when evaluating eccentric loads applied to a single chord angle, which result in additional bending moments and torsion that are not typically considered in standard design practice. This study presents an experimental and computational approach towards qualifying the response of a steel joist with nonsymmetric sections and eccentric loading. An experiment was conducted in which a joist was subjected to uniform top-chord loading with an eccentric hanging load applied to one chord angle, while displacements and strains along the bottom chord were recorded. A second-order structural analysis with a novel beam-element formulation that considers nonsymmetric sections was able to accurately estimate the deflections and rotations of the joist bottom chord. Several alternative computational models were created to determine the effects of common design assumptions on the analysis output. It was found that model variations including using a first-order analysis, simplifying the hanging load condition, and using doubly-symmetric section behavior only resulted in changes to the applied torsion and corresponding rotations, which led to worse predictions of stresses and deflections on the chord angle. Detailed measurements of each cross-section geometry in the joist were obtained using a handheld three-dimensional laser scanner. Despite the significant changes in torsional cross-section properties, the computational model with measured cross-section properties resulted in minimal variations compared to the model with nominal section properties. The work presented herein provides insight into the torsional response of steel joists with eccentric loads. |
| 出版年： | 2023 |
| 期刊名称： | Journal of structural engineering |
| 卷： | 149 |
| 期： | 5 |
| 页码： | 04023027.1-04023027.13 |
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