Calibration of Turkish LRFD bridge design method for slab on steel plate girders

Koç, Ahmet Fatih
Steel composite I-girder bridges are usually used to span between 50 to 80 meters in Turkey. In a typical Turkish bridge design, a modified version of the AASHTO LFD (Load Factor Design) or ASD (Allowable Stress Design) requirements are used 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 define a new type of live (truck) load to be used in the basic gravity load combination, as well as to develop the corresponding load factors to be implemented in the design of steel composite I-girder bridges. 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 4.00 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.


Calibration of Turkish LRFD bridge design code for slab on steel plate girders
Koç, A. Fatih; Caner, Alp; Yücemen, Mehmet Semih (IOS Press, 2013-01-01)
In Turkish design practice, slab on steel composite I-girder bridges have been designed to span between 50 and 80 meters. To date, modified versions of the AASHTOLFD (Load Factor Design) or ASD (Allowable Stress Design) requirements are adapted in Turkey. The recent switch of the U.S. bridge codes to Load Resistance Factor Design (LRFD) method also necessitates the calibration of the Turkish LRFD design code that is under development. In this on-going research, it has been determined that the current Turkis...
Seismic performance of unbonded elastomeric bearings on bridges : an experimental and parametric study
Domaniç, Kemal Arman; Caner, Alp; Department of Civil Engineering (2015)
Elastomeric bearings were used in a majority of bridges completed in Turkey. Usually, the connection between bearings and the structure were established only by means of friction. Vertical excitation can contribute to a significant damage in such cases, especially at bearing locations, as indeed was the case in the recent 1999 İzmit Earthquake. In Turkish seismic design practice, a common friction coefficient of 0.20 is frequently used. The aim of this study is to look into the values suggested by specifica...
Design of cast-in-place balanced cantilever bridges in Turkey
Caner, Alp (null; 2010-01-01)
The cast-in-place balanced cantilever bridges are becoming popular in Turkey. Most of the highway bridges are designed using a modified version of the AASHTO bridge specifications. Differences in US design practice and Turkish design practice will be summarized in this paper. The differences are usually observed in design loads and in selection of concrete material properties. The static and dynamic analysis of bridges including construction staging is similar to the ones in USA. A case study is presented a...
Improvement of computational software for composite curved bridge analysis
Kalaycı, Ahmet Serhat; Topkaya, Cem; Department of Civil Engineering (2005)
In highway bridge construction, composite curved girder bridges are becoming more popular recently. Reduced construction time, long span coverage, economics and aesthetics make them more popular than the other structural systems. Although there exist some methods for the analysis of such systems, each have shortcomings. The use of Finite Element Method (FEM) among these methods is limited except in the academic environments. The use of commercial FEM software packages in the analysis of such systems is cumb...
Caner, Alp; Shaban, Nefize (null; 2017-01-05)
A standard highway bridge has usually multi simple spans supported over piers by elastomeric bearings in Turkey. The bearings usually do not provide a positive connection but in contact with girder and pier by only gravitational forces. In this study, a model test bridge of about ½ scale have been shaken under low to moderate earth quakes to determine the change in response of the bridge with different seismic isolation configurations. Three configurations of bearings are elastomeric bearings, lead core bea...
Citation Formats
A. F. Koç, “Calibration of Turkish LRFD bridge design method for slab on steel plate girders,” M.S. - Master of Science, Middle East Technical University, 2013.