Steel concentrically braced frames using tubular structural sections as bracing members: Design, full-scale testing and numerical simulation

Autor: Stephen A. Mahin, Jiun-Wei Lai
Rok vydání: 2014
Předmět:
Zdroj: International Journal of Steel Structures. 14:43-58
ISSN: 2093-6311
1598-2351
DOI: 10.1007/s13296-014-1006-4
Popis: This paper presents the results of experimental and analytical studies carried out on two full-scale, one-bay, two-story steel concentrically braced frames. Square hollow and round hollow structural sections were used for the bracing components. The specimens were designed and detailed according to the 2005 AISC Seismic Provisions, and tested cyclically under displacement control but with a fixed lateral load distribution over height. Numerical computational models including the brace components, gusset plate details and frame members were implemented in OpenSees. Numerical simulations were then performed to investigate the cyclic behavior of brace components, brace failure mechanisms and overall system response. Satisfactory agreement was obtained in comparisons of experimental and numerical results. Premature failures observed suggest that beamto-gusset plate connections could be pinned to accommodate large rotational demands at this location without the need to form plastic hinges. Test results also showed that for the braced frames having the same configuration, designed for similar base shear capacities, and subjected to the same roof level displacement history, the braced frame specimen using round tubular sections as diagonal braces was able to sustain larger story drifts without brace fracture than the specimen employing square tubular sections. Fracture of the column base in the second specimen, although inconclusive from a single test, suggests more study is needed of design requirements for column to base plate connections where large variations of axial, bending and shear load are expected.
Databáze: OpenAIRE
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