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Structural Engineering and Mechanics Volume 57, Number 6, March25 2016 , pages 1051-1064 DOI: https://doi.org/10.12989/sem.2016.57.6.1051 |
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Effect of stiffener arrangement on hysteretic behavior of link-to-column connections |
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Saman Zarsav, Seyed Mehdi Zahrai and Asghar Vatani Oskouei
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| Abstract | ||
| Link-to-column connections in Eccentrically Braced Frames (EBFs) have critical role in their safety and seismic performance. Accordingly, in this study, contribution of supplemental stiffeners on hysteretic behavior of the link-to-column connection is investigated. Considered stiffeners are placed on both sides and parallel to the link web between the column face and the first stiffener of the link. Hysteretic behaviors of the link beams with supplemental stiffeners are numerically investigated using a pre-validated numerical model in ANSYS. It turned out that supplemental stiffeners can change energy dissipation mechanism of intermediate links from shear-flexure to shear. Both rectangular and trapezoidal supplemental stiffeners are studied. Moreover, optimal placement of the supplemental stiffeners is also investigated. Obtained results indicate a discrepancy of less than 9% in maximum link shear of the numerical and experimental specimens. This indicates that the numerical results are in good agreement with those obtained from the test. Trapezoidal supplemental stiffeners improve rotational capacity of the link. Moreover, use of two supplemental stiffeners at both ends of the link can more effectively improve hysteretic behavior of intermediate links. Supplemental stiffeners would also alleviate the imposed demands on the connections. This latter feature is more pronounced in the case of two supplemental stiffeners at both ends of the link. | ||
| Key Words | ||
| link-to-column connections; supplemental stiffeners; cyclic behavior; plastic hinges; trapezoidal supplemental stiffeners | ||
| Address | ||
| Saman Zarsav: Islamic Azad University, Takestan Branch, Takestan, Iran Seyed Mehdi Zahrai: School of Civil Engineering, The University of Tehran, Tehran, Iran Asghar Vatani Oskouei: Shahid Rajaee Teacher Training University, Tehran, Iran | ||