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Analysis and Design of Noncompact and Slender CFT Beam-Columns
| 题名： | Analysis and Design of Noncompact and Slender CFT Beam-Columns |
| 正文语种： | 英文 |
| 作者： | Zhichao Lai;Amit H. Varma;Lawrence G. Griffis |
| 作者单位： | Purdue Univ., West Lafayette |
| 关键词： | Noncompact; Slender; Concrete-filled steel tube; Beam-columns; Finite-element analysis; Design; Metal and composite structures |
| 摘要： | Concrete-filled steel tube (CFT) beam-columns are categorized as compact, noncompact, or slender depending on the governing slenderness ratio (width-to-thickness b/t or D/t ratio,)of the steel-tube wall. The current AISC specification recommends the bilinear axial force-bending moment (P — M) interaction curve for bare steel members for the design of noncompact and slender CFT beam-columns. This paper compiles the experimental database of tests conducted on noncompact and slender CFT beam-columns, and demonstrates the over-conservatism of the AISC P — M interaction curve. This paper also presents the development and benchmarking of detailed 3D finite-element models for predicting the behavior and strength of noncompact and slender CFT members. The benchmarked models are then used to evaluate the fundamental P — M interaction behavior of CFT beam-columns, and the influence of material and geometric parameters such as the tube slenderness ratio (A), material strength ratio (Fy/f'c), member length-to-section depth ratio (L/D), and axial load ratio (P/P0). The parametric analyses indicate that for L/D ratios up to 20, the P — M interaction curves are governed by the relative strength ratio (csr=ASFX/Acf'c). The parametric analysis results are used to propose revisions to the current standard's interaction equations for designing noncompact and slender CFT beam-columns. DOI: 10.106l/(ASCE)ST.1943-541X.0001349. © 2015 American Society of Civil Engineers. |
| 出版日期： | 2016.01 |
| 出版年： | 2016 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | Vol.142 |
| 期： | NO.01 |
| 页码： | 04015097 |
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