Experimental In-Situ Testing of Reconsructed Old Bridge in Mostar

Abstract eng:
Presented in the paper are the experimental results obtained by ambient vibration measurements of Old Bridge in Mostar, Bosnia and Herzegovina. The measurements and analysis are performed within the scientific cooperation between IZIIS, University St. "Cyril and Methodius", Skopje, Macedonia 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, during the war, the bridge was completely demolished by explosion 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. For measuring the ambient vibrations three Ranger seismometers, Kinemetrics product, were used. Measurements were performed in transversal, longitudinal and vertical direction, in 22 points along the bridge with objective to obtain its dynamic characteristics. The measurements were conducted using a high speed data acquisition system. Modal analysis was performed with ARTeMIS software. The natural (resonant) frequencies of the bridge as well as the shapes of vibration were clearly expressed. The obtained experimental results are compared with analytically obtained values by SAP2000 as well as by TOWER5.0 computer software and they present a qualitative base for performing further non-linear analysis and evaluation of the seismic stability of this respective monument.

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