Page 141 - Çevre Şehir İklim İngilizce - Sayı 4

Cenk Alhan - Mert Hacıemiroğlu

Conclusions and Suggestions

For creating resilient cities, structures must not only survive after major
earthquakes, but also public buildings and even industrial facilities must
continue their functions without interruption, and the damage to housing
must be limited and repairable. Seismic isolation technology, which can
provide this earthquake performance by protecting both the building contents
and the structure itself from the harmful effects of the earthquake, is being
applied at an increasing pace in Türkiye as well as in the world. In this study,
important examples of recent seismic isolation applications in Türkiye were
presented, the philosophy of seismic isolation building design was set out
within the framework of the rules specified in the Turkish Building Earthquake
Regulation (2018), and the steps of modeling and designing an exemplary
seismic isolation building were shown. As a result of the effects of near-fault
and vertical earthquakes, which have a high amplitude and long-period
velocity pulse with a seismic isolation building model, the vertical acceleration
components of which were studied using a high near-fault earthquake record
set, it was revealed how the demands for isolator displacement increase when
the velocity pulses in near-fault earthquakes coincide with the isolation period,
and how high vertical accelerations in near-fault earthquakes cause lifting in a
large number of isolators. In the examined sample, the displacement demand
reached 93.2 cm and up to 1 mm of lifts occurred in all isolators. In addition,
it was shown that floor accelerations exceeded the 0.2 g limit in all floors
defined in the circular of Ministry of Health of Republic of Türkiye published in
2013, but remained below the 0.3 limit set out in the circular updated in 2018.

References

Alhan, C. ve Gavin, H. (2004). “A Parametric Study of Linear and Non-linear
Passively Damped Seismic Isolation Systems for Buildings”. Engineering
Structures, 26:485–497.
Alhan, C. ve Gavin, H. (2004). “Reliability of Base Isolation for the Protection of Critical
Equipment from Earthquake Hazards”. Engineering Structures, 27:1435–1449.

Alhan, C. ve Şahin, F. (2011). “Protecting Vibration-sensitive Contents: An
Investigation of Floor Accelerations in Seismically Isolated Buildings”. Bulletin of
Earthquake Engineering, 9:1203–1226.
Alhan, C. ve Öncü-Davas, S. (2016). Performance limits of seismically isolated
buildings under near-field earthquakes. Engineering Structures116:83–94.

130 The Journal of Environment, Urban and Climate