Strengthening of seismically deficient moment-resisting frames with yielding metallic damper

Elgammal, Ahmed; Ali, Yasmin; Seleemah, Ayman

doi:10.21608/dusj.2023.318652

Strengthening of seismically deficient moment-resisting frames with yielding metallic damper

Document Type : Original research papers

Authors

¹ Civil Engineering Department, Faculty of Engineering, Delta University for Science and Technology, Gamasa, 11152, Egypt

² Structural Engineering Department, Faculty of Engineering, Tanta University, Tanta, 31527, Egypt

10.21608/dusj.2023.318652

Abstract

Due to the continuous development of codes of practice and design guidelines, existing moment-resisting
frames might become deficient because of not satisfying the requirements of them. On the other hand, yielding
metallic dampers are one of the most commonly known methods to strengthen deficient buildings to safely
withstand seismic excitations. Therefore, this research presents an assessment of the seismic performance of
moment-resisting frames strengthened with a particular type of yielding metallic dampers known as the
“vertical shear link” using the finite element software ETABS (18.0.0). For this purpose, five-, ten-, and fifteenstory steel buildings that are designed to resist gravity loads only are installed with vertical shear links and their
response is evaluated using modal, pushover, and time-history analyses. The vertical shear links are made of
either steel or magnesium and they are installed in different locations throughout the buildings. Modal analysis
results indicate that the installation of vertical shear links shortens the fundamental period of the buildings.
Moreover, the pushover curves underscore the efficiency of vertical shear links in upgrading the performance
level of the buildings. However, this does not apply for the fifteen-story building since the number of the
installed vertical shear links is found to be not sufficient. Time-history analysis also confirms the same findings
since, in contrast to the five- and ten-story buildings, the story displacements and interstory drifts of the fifteenstory building are not significantly decreased after strengthening. Also, the vertical shear links are found to
participate in dissipating a considerable amount of seismic energy

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