Experimental testing of fatigue life and improvement of trapezoidal longitudinal ribbed on bridge decks

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Yıldız Teknik Üniversitesi, Fen Bilimleri Enstitüsü, Türkiye

Tezin Onay Tarihi: 2017

Tezin Dili: İngilizce

Öğrenci: ZAID HUSHAM JASIM AL MOHAMMEDAWI

Danışman: Fatih Alemdar

Özet:

All over the world, many long-span steel bridge structures used the orthotropic trapezoidal longitudinal ribbed steel bridge deck as one of the basic building blocks in the structural system, for distribution of traffic loads in decks and for the stiffening of slender girder plate elements in compression[1].

This thesis involves a laboratory test of two specimens, as well as a simulation of the model by the finite element method simulation (Abaqus program). The specimens is a trapezoidal longitudinal ribbed. Through laboratory testing, the two specimens will be loaded to demonstrate its impact on fatigue cracks.

One of the two specimens will be testing by strain gauge test to find the strain of the specimens and comparing with the strain that will be obtained from simulation by Abaqus program and hand calculation. The number of cycles that cause fatigue cracks will be taken into consideration to measure the size of fatigue cracks.

When the fatigue failure was found before many years and made problems for orthotropic decks, it is necessary to identify areas where fatigue cracking occurs, therefore to study the case and find solutions to treat it.

By hand calculation, depending on the output results from laboratory test, calculate the values of strain for the specimens.

The parametric study was performed using 3D finite element analysis simulation to learn the effect of the welding and the thickness of the plate on the value of stress and displacement for the specimens.