Dede, Sahin; Rossetto, Tiziana; Hancilar, Ufuk; Freddi, Fabio; (2023) Code-based seismic performance assessment of high-rise tunnel-form buildings in Turkey. In: Proceedings of Conference Earthquake risk and engineering towards a resilient world (SECED 2023). Society for Earthquake and Civil Engineering Dynamics (SECED): Cambridge, UK.

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Abstract

Tunnel-form buildings are one of Turkey’s most common typologies for mass housing projects. They are known for their rapid construction process, relatively lower construction costs and shorter construction time. These structures are mainly composed of lightly reinforced thinsectioned shear walls, coupling beams and slabs and can reach up to 20 stories or even more in some cases. The design of these structures is typically based on force-based linear elastic procedures and relies on the behaviour factor and dominant vibration modes to estimate earthquake forces. Shear walls are designed and detailed according to frame and dual systems regulations. Moreover, the minimum reinforcements required by the code are usually sufficient since the shear wall area to floor area is high. In previous earthquakes, low- and mid-rise tunnelform buildings designed according to current standards exhibited high seismic performance. However, some drawbacks and limitations may characterise the design of taller structures. In this context, the present paper investigates the seismic performance of a 14-storey case study residential tunnel-form building located in Istanbul and considers two editions of the Turkish Building Seismic Code (i.e., the TBSC 2007 and 2018) for the performance assessment. A detailed non-linear finite element (FE) model was developed in OpenSeesPY to perform nonlinear time-history analyses considering a set of natural ground motion records. The numerical model considers the inelastic behaviour of the shear walls through fibre-based distributed plasticity elements aggregated with the bilinear shear response. The elastic response of the FE model was validated against the experimental results from ambient vibration monitoring. The comparative seismic performance assessment shows that the TBSC 2018 results in more severe damage estimation, hence highlighting potential drawbacks of buildings designed with previous standards.

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