Reliability based evaluation of seismic design of Turkish bridges by using load and resistance factor method

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2014
Yılmaz, Seyit Alp
This study aims to evaluate the safety level of seismic design of Turkish highway bridge pier columns with respect to reliability theory. Evaluation of bridges was performed for four different codes of American Association of State Highway and Transportation Officials (AASHTO). Reliability indices were calculated for AASHTO Load and Resistance Factor Design 2010 (AASHTO LRFD 2010), AASHTO LRFD 2007, AASHTO Standard Specifications of Highway Bridges (LFD 2002) and Turkish modification of AASHTO LFD 2002 (current design code for highway bridges in Turkey). In the scope of project number of 110G093 “Development of Turkish Bridge Design Engineering and Construction Technologies” associated with Middle East Technical University (METU) and Scientific and Technological Research Council of Turkey (TUBITAK) and Turkish bridge design authority General Directorate of Highways (KGM), a new seismic design chapter was proposed based on LRFD provisions. In this study, proposed specifications were also evaluated based on the structural reliability methodology. The statistical data of all components in seismic load demand and column carrying capacity were studied based on both local and international literature to assess the uncertainties. Seismic load demand was calculated with response spectrum analysis of simplified single degree of freedom models of various bridges. Load carrying capacity of pier columns were checked for bi-axial bending combined with axial compression. For that purpose, an algorithm based on Green’s theorem was written for development of the interaction surface adopted from the “Interaction Surfaces of Reinforced – Concrete Sections in Biaxial Bending” (Fafitis, 2001). Reliability index was calculated with numerical Monte Carlo Simulation Method and compared with First Order Reliability Method and First Order Second Moment Reliability Methods.

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Citation Formats
S. A. Yılmaz, “Reliability based evaluation of seismic design of Turkish bridges by using load and resistance factor method,” M.S. - Master of Science, Middle East Technical University, 2014.