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Seismic Response of Cold Formed Steel Frames Sheathed by Fiber Cement Boards

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Abstract

In this paper, the seismic performance of cold formed steel shear walls sheathed by fiber cement boards (FCB) is investigated. Of particular interest is the seismic response modification factor of FCB shear walls. Nonlinear incremental dynamic analyses of multi-story cold formed steel framed structures were carried out following an approach adopted by FEMA-P695 on the description of building seismic behavior. Different scaled earthquake records in three different earthquake prone regions located on low, medium and high seismic risk zones in Iran were taken into account. One, two and three story CFS archetype buildings were analyzed using models created in OpenSees software to predict structural performance of the buildings. Nonlinear dynamic time history analyses were carried out employing OpenSees software utilizing 2D models of a FCB braced wall tower. A stick model was created whose behavior was fitted to the lateral resistance versus deformation of each story that braced elements in the model. The elements were defined via material Pinching4 to construct a uniaxial material exhibiting pinched load-deformation response and demonstrate degradation under cyclic loading. The results show that most relevant codes which suggest the value of seismic response modification factor equal to 2 for cold formed steel shear walls sheathed by FCB are acceptable only for up to three story buildings in low seismic risk zone, up to two story in medium seismic zone and one story in high seismic risk zone.

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Authors and Affiliations

  1. Department of Civil Engineering, University of Isfahan, Isfahan, Iran

    Mehran Zeynalian, Ali Zarezadeh Shahrasbi & Hossein Tajmir Riahi

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  1. Mehran Zeynalian
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  2. Ali Zarezadeh Shahrasbi
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  3. Hossein Tajmir Riahi
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Correspondence to Mehran Zeynalian.

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Zeynalian, M., Shahrasbi, A.Z. & Riahi, H.T. Seismic Response of Cold Formed Steel Frames Sheathed by Fiber Cement Boards. Int J Civ Eng 16, 1643–1653 (2018). https://doi.org/10.1007/s40999-018-0307-y

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  • DOI: https://doi.org/10.1007/s40999-018-0307-y

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