https://scholars.lib.ntu.edu.tw/handle/123456789/598439
標題: | High-strength steel deep H-shaped and box columns under proposed near-fault and post-earthquake loadings | 作者: | Lin T.-H Chou C.-C. CHUNG-CHE CHOU |
關鍵字: | BRBF;H-shaped column;Hollow box column;Near-fault earthquake loading test;Nonlinear time history analysis;Earthquakes;Faulting;High strength steel;Loads (forces);Box columns;Buckling restrained braced frames;Earthquake loadings;H-shaped;Loading tests;Near-fault earthquake;Shaped columns;Structural frames | 公開日期: | 2022 | 卷: | 172 | 來源出版物: | Thin-Walled Structures | 摘要: | This paper presents the seismic evaluation of high-strength steel first-story columns in a seven-story dual system, composed of a special moment-resisting frame (SMRF) and buckling-restrained braced frame (BRBF), in near-fault and post near-fault earthquakes. Nonlinear time history analyses were conducted on the frame to develop loading protocols that represent seismic demands on the first-story columns in the dual system. The proposed near-fault displacement protocol has a large displacement pulse from -2 to +4% drift, followed by small displacement cycles oscillated at a residual drift of 2.5%. The proposed far-field displacement protocol is an increasingly cyclic displacement protocol with one cycle after a drift of 2%. Two built-up H-shaped column specimens (HC-20-B and HC-20-C) and two built-up box column specimens (HBC-40-B and HBC-40-C), representing the first-story columns in the dual system, are tested under constant axial force (0.2Py or 0.4Py) and lateral drifts based on the proposed loading protocols. These specimens that satisfy the compactness requirement of highly ductile members in AISC 341-16 (2016) show acceptable seismic performance under the near-fault earthquake loading. However, the flexural strength of HC specimens decreases with increasing drift, and that of HBC specimens increases without strength degradation. The HBC specimens can perform well in the subsequent near-fault or far-fielding earthquake loading, which is not the case for the HC specimens due to significant local buckling. The NIST (2017) backbone curve reasonably predicts the test envelope of the HC specimens, but significantly underestimates the test envelope of the HBC specimens. ? 2022 Elsevier Ltd |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85123634482&doi=10.1016%2fj.tws.2022.108892&partnerID=40&md5=10782105c89490965f253091cef834f7 https://scholars.lib.ntu.edu.tw/handle/123456789/598439 |
ISSN: | 02638231 | DOI: | 10.1016/j.tws.2022.108892 |
顯示於: | 土木工程學系 |
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