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Ambient Test of Reconstructed Old Bridge in Mostar

The measurements and analysis presented here are performed by Associate Prof. Dr Lidija Krstevska and Prof. Dr Ljubomir Taskov, Institute of Earthquake Engineering and Engineering Seismology (IZIIS), University "Ss. Cyril and Methodius", Skopje, Republic of Macedonia in April 2007, within the scientific cooperation between IZIIS and the Civil Engineering Faculty, University of Mostar, Bosnia and Herzegovina.


The stone-masonry Old Bridge in Mostar is a symbol of the town and it is well known in the world database of historical heritage. The original Old Bridge was built during 16th century. In 1993 the bridge was completely demolished by an explosion as shown below, and in 2003 completely reconstructed with the same appearance as the original one.

The bridge is a stone-masonry arch structure 13.5m in height and 29m in length, as shown below.

The Measurements

For measuring the ambiental vibrations three Ranger seismometers, Kinemetrics product, were used.

Measurements were performed in transversal, longitudinal and vertical direction, in 22 points along the bridge. 11 points in one test setup on one side and 11 in another test setup on the other as shown below.

The management of measurements, geometry and DOF definitions was conducted by the ARTeMIS Testor.

The Analysis

The Operational Modal Analysis was performed using ARTeMIS Extractor 2008 and below the most important modes can be viewed as AVI animations. Remember to set the Movie Player to "Repeat Forever".


AVI movies of some of the identified modes:

Longitudial / Vertical 7.2 Hz Transversal / Vertical 7.62 Hz
Longitudial / Vertical 11.43 Hz Transversal / Vertical 14.06 Hz
Longitudial / Vertical 13.96 Hz Transversal / Vertical 23 Hz



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