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Cyclic Loading Test for Two-Story RC Moment Frames Retrofitted with Internal Steel Frames
| 题名： | Cyclic Loading Test for Two-Story RC Moment Frames Retrofitted with Internal Steel Frames |
| 正文语种： | eng |
| 作者： | Lee, Ho-Jun;Lee, Hae-Bin;Park, Hong-Gun;Lee, Jong-Kweon |
| 作者单位： | POSCO Steel Struct Res Grp 100 Songdogwahak Ro Incheon 21985 South Korea|Seoul Natl Univ Dept Architecture & Architectural Engn 1 Gwanak Ro Seoul 08826 South Korea;Seoul Natl Univ Dept Architecture & Architectural Engn 1 Gwanak Ro Seoul 08826 South Korea|DONG YANG Struct Engineers Co Struct Design Div 2 7 Beopwon Ro 11 Gil Seoul 05836 South Korea;Seoul Natl Univ Dept Architecture & Architectural Engn 1 Gwanak Ro Seoul 08826 South Korea;CTS Engn 16 Macheon Ro 26 Gil Seoul 05839 South Korea |
| 关键词： | Seismic retrofit;Existing reinforced-concrete (RC) moment frames;Internal steel frame;Connection;Composite action |
| 摘要： | An internal steel frame-retrofitting method without diagonal braces was studied to strengthen existing reinforced-concrete (RC) moment frames with nonseismic details. For better constructability and structural capacity, a novel shear connection method was developed and verified by cyclic shear testing. To evaluate the seismic performance of retrofitted frames, three two-story moment frames with and without strengthening were tested under cyclic lateral loading. The test results showed that, despite partial composite action between RC and steel members, the proposed retrofit method significantly increased the stiffness and strength of the RC moment frame, achieving a satisfactory deformation capacity greater than 2% drift ratio. On the basis of the test results, the failure mechanism of the retrofitted frame was discussed, considering the shear connection behavior. The test strengths of the frame specimens were compared with the predictions based on a simple plastic mechanism. Further, the degree of partial composite action between the RC and steel members developed by shear connections was addressed to improve the strength predictions. (C) 2020 American Society of Civil Engineers. |
| 出版年： | 2021 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | 147 |
| 期： | 2 |
| 页码： | 04020333.1-04020333.15 |
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