Mustafa ERDİK: Seismic Isolation Applications and Developments in Turkey

There is a special need to preserve the functionality of critical structures such as hospitals, bridges, industrial facilities, communication and emergency centers, and police and fire stations under severe earthquakes. In this sense, seismic isolation (SI) technology serves as an alternative design method for the protection of their functionality.

This paper provides a brief survey of the structures in Turkey with passive structural control. The utilization of the technique of seismic isolation for new structures and retrofit of existing structures is developing at a high rate in the country. As of 2016 there exist a multitude of structures with seismic isolation, including hospitals, schools, airport terminals, LNG storage tanks, highway and railway viaducts and stadia. Most of the recent activity have focused on viaducts and hospital buildings.

The 2016 revision of the Earthquake Resistant Design Code in Turkey will encompass a chapter on the design seismic isolation systems for building type structures. A brief explanation of the new seismic isolation code in terms of design levels, associated performance targets and criteria, methodologies of analysis and design, testing of the isolator units and other issues of importance is provided. A comparison of the draft Turkish Code with the US (ASCE 7-10), the European (Eurocode 8, EC8) and the Japanese (Building Standard Law) codes on performance criteria, design essentials, design review process, testing and the approval of isolator units, is provided.