Lessons Learnt from Repair Project of 300 Buildings Damaged in Darb-E-Astaneh, Iran Earthquake of March 2006

Abstract eng:
In 31st March of 2006 an earthquake of 6.1 magnitude hit the Silakhor plain in Lorestan Province, Iran, which affected cities of Boroojerd and Dorood, and created damage in hundreds of building, including houses in these two cites and their neighboring villages. ‘Behsazeh-Andishan Aria Consulting Engineers’ has been chosen as one the consulting firms for seismic evaluation and retrofit or repair design of damaged buildings, and has been responsible for around 300 buildings in Boroojerd. Most of these buildings were of non-reinforced masonry and semi-skeleton type. At first, seismic evaluation of buildings was performed and then, an estimation of repair costs was done for each case so that the owner of the building can make decision on doing the full repair, doing just minor repair, or demolishing the building. Because of time pressure, and very high number of buildings, doing test on the existing materials was not possible, and this led in some decrease in the precision of seismic evaluation, and therefore the repair design was decided to be conservative to some extent. The repair design in case of brick masonry building was mainly using steel mesh and shotcrete on walls in east-west direction. In some cases the wall section area was not sufficient based on the code requirements, and therefore adding some walls sections was necessary, and in some cases using steel profiles as ties was necessary to give enough integrity to the building. The detailed explanation of the repair design and its challenges are presented in the paper. Boroojerd City, Non-reinforced Masonry, Steel Mesh, Shotcrete

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