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Experimental Investigation of the Inelastic Cyclic Behavior of Concrete-Filled Double-Skin Tubular Beam-Columns with Corrugated Inner Skins and Ultrahigh-Strength Corner Tubes
| 题名： | Experimental Investigation of the Inelastic Cyclic Behavior of Concrete-Filled Double-Skin Tubular Beam-Columns with Corrugated Inner Skins and Ultrahigh-Strength Corner Tubes |
| 正文语种： | eng |
| 作者： | Mojtaba Farahi;Amin Heidarpour;Dimitrios G. Lignos;Xiao-Ling Zhao;Riadh S. Al-Mahaidi |
| 作者单位： | Monash Univ.;Monash Univ.;Civil Environmental Engineering;Hong Kong Polytechnic Univ.;Swinburne Univ. of Technology |
| 关键词： | Composite-steel concrete members;Cyclic loading;Concrete-filled double-skin tubular (CFDST) beam-columns;Axial shortening;Multiaxial loading;Full-scale experiments;Local buckling;Weld fracture;Seismic retrofitting |
| 摘要： | Abstract This paper presents the experimental results from nine full-scale concrete-filled double-skin tubular (CFDST) beam-columns. The test specimens exploited two fabrication strategies, featuring either hollow steel inner skins with corrugated geometry or ultrahigh-strength steel corner tubes to enhance the seismic performance of noncompact CFDST beam-columns for potential use in low-to-moderate seismicity regions. The effects of loading sequence, axial load ratio, and cross-sectional geometry were investigated. The experimental results suggested that the current AISC specification may be used to predict the axial strength of composite members with a relatively good accuracy. In the postbuckling range, conventional CFDST beam-columns and those with corrugated inner skins are prone to fracture at the corner welds of the built-up cross section. However, the latter exhibited up to two times larger drift capacities than conventional CFDST counterparts prior to losing axial load carrying capacity. Noncompact beam-columns retrofitted with ultrahigh-strength steel corner tubes exhibited a 4% lateral drift demand without experiencing more than 25% flexural strength loss. The presence of ultrahigh-strength steel increases the plastic hinge length of CFDST beam-columns by up to four times relative to CFDST beam-columns with corrugated inner skin, regardless of the employed loading history. |
| 出版年： | 2022 |
| 期刊名称： | Journal of structural engineering |
| 卷： | 148 |
| 期： | 12 |
| 页码： | 8-22 |
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