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A new approach to retrofit the diagrid structures using an improved outrigger-braced system

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Abstract

This paper examined the effect of outrigger braces with improved arrangements on the seismic performance of diagrid steel structures to enhance the performance of a diagrid structural system. To this aim, a tall steel structure was selected and equipped with outrigger braces by placing truss braces in three different positions and arrangements, including horizontal, V-shaped, and \( {\Lambda }\)-shaped (IV-shaped). The V- and \( {\Lambda }\)-shaped arrangements constituted an improved outrigger-braced system. Perform3D was utilized for modeling and nonlinear incremental dynamic analysis (NIDA). Finally, the fragility curves for the models were derived through IDA analysis and a log-normal probability distribution. The numerical analysis demonstrated that improved outrigger braces would significantly enhance the seismic performance of high-rise buildings with a diagrid system. The location of the truss belt on the 25th and 50th floors dramatically improved the structure’s seismic performance and collapse margin ratio (CMR). Thus, the CMR value of the outrigger-braced models on the 25th and 50th floors was about 2.33 times the base model. Besides, the V-shaped truss belt in the outrigger system exhibited the best seismic performance. The CMR value peaked in this arrangement. The results of the pushover analysis showed that equipping diagrid tall buildings with outrigger braces had little effect on structural flexibility and only increased the energy absorption of the system.

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Authors and Affiliations

  1. Faculty of Civil Engineering and Architecture, Shahid Chamran University of Ahvaz, Ahvaz, Iran

    Abbas Abdulkarim Dunin, Farhad Hosseinlou, Mojtaba Labibzadeh & Abbas Rezaeian

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  1. Abbas Abdulkarim Dunin
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  2. Farhad Hosseinlou
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  3. Mojtaba Labibzadeh
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  4. Abbas Rezaeian
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Contributions

Farhad Hosseinlou Abbas Abdulkarim Dunin: Conceptualization, Methodology, Software, Data curation, Writing - original draft, Writing - review & editing. Mojtaba LabibzadehAbbas Rezaeian: Software, Data curation, Validation, Writing - original draft, Writing - review & editing.

Corresponding author

Correspondence to Farhad Hosseinlou.

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The authors of this manuscript, whose names are mentioned right below, attest NO connections to or engagement with any entity or organization that has any kind of financial interest (e.g., membership, consulting fees, employment, stock/share ownership, honoraria, grants, speaking engagements, patents, paid expert testimonies, etc.) or non-financial interest (e.g., knowledge or beliefs, affiliations, personal/professional relationships) in the topics or materials covered in it.

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Dunin, A.A., Hosseinlou, F., Labibzadeh, M. et al. A new approach to retrofit the diagrid structures using an improved outrigger-braced system. Asian J Civ Eng (2024). https://doi.org/10.1007/s42107-024-01056-2

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