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Steel and Composite Structures Volume 41, Number 5, December10 2021 , pages 747-759 DOI: https://doi.org/10.12989/scs.2021.41.5.747 |
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Seismic response of built-up double-I column in steel moment resisting frame using welded external diaphragm plate |
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Amir Tabebordbar, Seyed Mehdi Dehghan, Farshid Fathi and Mohammad Amir Najafgholipour
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| Abstract | ||
| Built-up Double-I (BD-I) columns have been commonly used for mid-rise steel-frame structures in Iran. These columns consist of two hot rolled IPE sections which are connected by two cover plates and fillet welds. Until 2017, BD-I columns were employed in intermediate moment resisting frames (MRF) using welded flange plate (WFP) connections. To evaluate the seismic behavior of the connections, four samples were made and tested based on cyclic loading according to AISC 341-16. It was concluded that typical samples cannot satisfy the seismic provisions related to intermediate MRFs. In contrast, the proposed connections retrofitted with two-part external diaphragms were able to satisfy not only the seismic requirements related to intermediate MRFs but also those related to special MRFs according to AISC. The numerical modeling of these samples was performed using ABAQUS finite element software. This study compared the hysteresis moment-rotation curves, plastic strains, and behavior modes in both experimental samples and numerical models. | ||
| Key Words | ||
| built-up double-I column; cyclic load; external diaphragm; steel moment resisting frame; WFP connection | ||
| Address | ||
| Amir Tabebordbar and Farshid Fathi: Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran Seyed Mehdi Dehghan and Mohammad Amir Najafgholipour: Department of Civil and Environmental Engineering, Shiraz University of Technology, Shiraz, Iran | ||