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Experimental Performance of Block-Out Connections at the Base of Steel Moment Frames
| 题名： | Experimental Performance of Block-Out Connections at the Base of Steel Moment Frames |
| 正文语种： | 英文 |
| 作者： | Kevin N. Hanks, S.E., M.ASCE1; Paul W. Richards, P.E., M.ASCE2 |
| 作者单位： | 1Senior Structural Engineer, Frontier-Kemper Constructors, Inc., 1695 Allen Rd., Evansville, IN 47710. 2Associate Professor, Dept. of Civil and Environmental Engineering, Brigham Young Univ., 368 CB, Provo, UT 84602 (corresponding author). |
| 关键词： | connection；block；column；objective；moment；ncre；rete；dept；flex；design |
| 摘要： | In a block-out connection, a steel column is connected to a footing through an opening (block-out) in a slab-on-grade that is later filled with unreinforced concrete. In design, engineers generally neglect any beneficial effects of the block-out concrete. The objective of this study is to experimentally quantify the effect of block-out concrete on the lower-bound flexural strength and stiffness of block-out connections at the base of steel moment frames. Eight specimens were tested with varying column shape, block-out depth, and baseplate/anchor rod designs. The block-out concrete increased the connection flexural strengths by 69%–91% for block-out depths that were 1.2–1.5 times the column depth. A strength model proposed in previous work was found to reasonably predict the flexural strength, accounting for the effects of block-out concrete. With regard to stiffness, specimens with block-out concrete depths at least 1.15 times the column depth could be accurately modeled as fixed at the top-of-footing elevation. |
| 出版年： | 2019 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | 145 |
| 期： | 7 |
| 页码： | 1-9 |
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