Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

The Copmrasıon Of The Strength Of Undamaged Suspensıon Brıdge Wıth Current Sıtuatıon, One Of The Rods Broke Off.

If any of the structural elements in a structural system is damaged or looses its bearing capacity, the loads of this element are transferred to other structural elements. Only in this case the loads of other structural elements could exceed the loads foreseen for the design loads. If no additional safety margin is foreseen, exceeding the design loads is unavoidable. There are two possibilities at this point.

1- The loads of the damaged element are distributed among the other elements. Other elements are subject to loads exceeding the design loads. Even if the systems stands, the original safety has been lost.

2- Due to increasing loads for other elements, additional damages would occur. The system will collapse unless the load distribution is balanced.

In this case, the suggested solution is to repair and/or strengthen the element, if required using preloading, pre-displacement and other similar techniques, in a way to let the element bear the loads foreseen in the analysis and design and then to examine the whole system.

If the damaged element is only repaired and/or strengthened (without reaching the original load), the element will not carry any load in the beginning and the loads of this element are shared amongst the other elements. The repaired elements will start to carry the loads only after the systems makes the additional displacements. However, in this case the system might be in high risk due to increasing loads of other elements.

This case has been investigated for a suspension bridge in this study. The bridge is similar to Istanbul Bosphorus Bridge. The reason for using a similar bridge is the lack of complete detailed information for the Bosphorus Bridge. The unavailable data has been made available using measurements on site, assumptions and forecasts.

In this study, the behaviour of a suspension bridge under vertical loads has been investigated. It is possible to explain the study in three phases. In the first phase, the behaviour of the bridge under vertical loads has been investigated and the existing situation has been determined. In the second phase, one of the hanger cables has been removed and this new situation and the behaviour has been analysed and determined. In the third phase, assessing the redistribution of the loads after the hanger cable loss in the second stage, one of the neighbouring cables has been taken off and this new situation has been analysed and the behaviour and safety of the bridge has been examined. This study is not towards the design of a suspension bridge, therefore only the behaviour under vertical loads has been examined. The comparisons have been made making use of the available criteria of the original design.

TEMÜR Rasim ,

Danışman : Doç.Dr.Namık kemal ÖZTORUN

Anabilim Dalı : İnşaat Mühendisliği

Mezuniyet Yılı : 2006

Tez Savunma Jürisi : Doç.Dr.Namık kemal ÖZTORUN (Danışman)

Prof. Dr. Zekai CELEP

Prof. Dr. Ekrem MANİSALI

Prof. Dr. S. Feyza ÇİNİCİOĞLU

Doç. Dr. Ali Malik GÖZÜBOL