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Development and validation of a metallic haunch seismic retrofit solution for existing under-designed RC frame buildings 3
| Content Provider | Semantic Scholar |
|---|---|
| Author | Pampanin, Stefano Christopoulos, Constantin Chen, Te-Hsiu |
| Copyright Year | 2006 |
| Abstract | The feasibility and efficiency of a seismic retrofit solution for existing reinforced concrete frame systems, designed before the introduction of modern seismic-oriented design codes in the mid 1970s, is conceptually 9 presented and experimentally investigated. A diagonal metallic haunch system is introduced at the beam– column connections to protect the joint panel zone from extensive damage and brittle shear mechanisms, 11 while inverting the hierarchy of strength within the beam–column subassemblies and forming a plastic hinge in the beam. A complete step-by-step design procedure is suggested for the proposed retrofit strategy 13 to achieve the desired reversal of strength hierarchy. Analytical formulations of the internal force flow at the beam–column-joint level are derived for the retrofitted joints. The study is particularly focused on 15 exterior beam–column joints, since it is recognized that they are the most vulnerable, due to their lack of a reliable joint shear transfer mechanism. Results from an experimental program carried out to validate 17 the concept and the design procedure are also presented. The program consisted of quasi-static cyclic tests on four exterior, 3 scaled, beam–column joint subassemblies, typical of pre-1970 construction practice 19 using plain round bars with end-hooks, with limited joint transverse reinforcement and detailed without capacity design considerations. The first (control specimen) emulated the as-built connection while the 21 three others incorporated the proposed retrofitted configurations. The experimental results demonstrated the effectiveness of the proposed solution for upgrading non-seismically designed RC frames and also 23 confirmed the applicability of the proposed design procedure and of the analytical derivations. Copyright q 2006 John Wiley & Sons, Ltd. 25 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://ir.canterbury.ac.nz/bitstream/handle/10092/214/12605030_Main.pdf;jsessionid=7B142FDCFD47D19653368E9DAF5C22CB?sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
