ANIDIS - L'ingegneria Sismica in Italia, ANIDIS XIX & ASSISi XVII - 2022

Dimensione del carattere:  Piccola  Media  Grande

Seismic behavior of hybrid coupled walls equipped with self-centering connections

Mojtaba Farahi

Ultima modifica: 2022-08-29


Reinforce concrete walls connected with steel coupling beams are known as hybrid coupled wall (HCW) systems and commonly used as lateral force resisting systems in buildings located in seismic-prone regions. HCWs take advantage of the superior lateral stiffness of the pier reinforced concrete walls, while the coupling mechanism reduces the moment demand at the base of the walls.  In this study, a new hybrid coupled wall system is studied which is equipped with a friction-damped self-centering mechanism. The proposed lateral load bearing system is developed to address two concerns regarding the application of HCWa and self-centering systems. The self-centering system utilized in this study eliminates the coupling beams elongation problem, which can result in significant damages to the surrounding gravity framing.  In addition, it facilitates the application of pre-fabricated self-centering components, which mitigates uncertainties raised by pre-tensioning the connections on site. The seismic behavior of the proposed lateral load bearing system is investigated under several ground motions and different intensities to assess its efficiency in reducing the structural as well as non-structural damages in mid to high-rise buildings.  It is demonstrated that the applied self-centering mechanism has the capacity to minimize earthquake-induced residual deformations and consequently non-structural damages without exacerbating damages reported for the concrete walls in conventional hybrid coupled walls.  

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