Turkish LRFD Live Load Design Parameters for Cable Stayed Bridge with Concrete Deck on Steel Girder

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2015

Öğrenci: YUSUF DÖNMEZ

Danışman: ALP CANER

Özet:

In Turkey, bridge design procedure has been followed from a modified version of the AASHTO LFD (Load Factor Design) or ASD (Allowable Stress Design) requirements until now. The recent switch of the US bridge codes to LRFD method also necessitates the calibration of the new design of the Turkish bridges according to the LRFD system. The main aim of this study is to develop the load and resistance factors to be implemented in the design of steel composite I-girders of cable-stayed bridges (span lengths 420 m to 550 m) for the basic gravity load combination. Moreover, the performance of new type of live (truck) load of Turkish LRFD, namely, AYK-45 is evaluated. In such studies, usually a target reliability index is selected to reflect the safety level of current design practice based on the uncertainties associated with the design parameters. For the basic gravity load combination, which includes the dead and live loads, a minimum target reliability of 4.30 is selected, instead of 3.50 that have been used in US. In the statistical computations of the reliability index, the quantification of uncertainties is made based on local data supplemented by information compiled from relevant international literature.