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The beginnings and ends of guardrail designs have the function of providing adequate anchorage for the rest of the system. They should also demonstrate crashworthy performance and should not pose any hazard for errant vehicles. In Europe, the ends of guardrail systems traditionally have incorporated turned down end terminals. Due to its low cost, Turkey also adopted turned down guardrail end terminal, and the majority of these designs are 12 meters long. Accident statistics clearly demonstrate that this particular end terminal poses safety risks for impacting vehicles. However, crash tests performed on the system showed that it worked satisfactorily for cars impacting at 80 kph. In this study, a detailed finite element analysis was performed on a 12 m long turned down guardrail end treatment to fully evaluate its crashworthiness. Data obtained from previously performed TT 2.1.80 and TT 4.2.80 crash tests were used to verify the fidelity of finite element models used in the study. Further simulations performed in accordance with EN1317 part 7 at 100 kph demonstrated unacceptable performance for the end terminal. Results of the study are summarized and recommendations are presented.

ÖzMaksimum göreli kat ötelemeleri, yapıların yönetmeliklerce güvenlik açısından sınırlandırıldığı temel parametrelerden biridir. Ülkemizde halen yürürlükte bulunan 2007 Deprem Bölgelerinde Yapılacak Binalar Hakkında Yönetmeliğe göre, elde edilen göreli kat ötelemelerinin sınırları ve kriterleri, 2016 Türkiye Bina Deprem Yönetmelik taslağı ile değişmektedir. Bu çalışmada, her iki yönetmeliğin "Etkin Göreli Kat Öteleme" hesabı ve sınır şartları detaylı olarak karşılaştırılmıştır. Taslak yönetmelikte izin verilen göreli kat öteleme sınırlarının, dolgu duvar -çerçeve bağlantısının derzsiz olduğu durum için genel olarak illerin büyük çoğunluğunda arttığı, derzli tasarımda ise derzsize göre iki kat yükseldiği anlaşılmaktadır.Anahtar Kelimeler: Göreli kat ötelemesi, TBDY2016, Elastik tasarım spektral ivmesi Comparison of Reduced Relative Storey Drifts According to Current Earthquake Code (DBYBHY2007) and New Draft Earthquake Code (TBDY2016) AbstractMaximum relative floor displacements are one of the basic parameters that are limited by the regulations in terms of safety for the regulations. According to the Regulation on the Turkish Earthquake Code (TEC) 2007 which are currently in force in our country, the limits and criteria of the relative floor drifts obtained vary according to the TEC 2016 in draft. In this study, the "Effective Relative Floor Shift" account and boundary conditions of both directives are compared in detail. It is understood that the permissible floor folding limits allowed in the draft regulation are increased in the majority of the cases in general, in case of the joint of the filler wall-frame joint, and in the case of the jointed design, two times higher than the joint.

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