Seismic Evaluation of 300 Damaged Buildings in Darb-E-Astaneh, Iran Earthquake of March 2006 for Their Repair Design

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 (almost 70% of residential buildings in Iran are to masonry type, mostly non-reinforced), and semi-skeleton type. At first, a visual screening was done to select the buildings which were worth to repair. The selection criterion was the estimated damage of less than 70%. The visual inspections were focused on the visible structural and nonstructural deficiencies of the building, including the lack of structural system, particularly the lateral load bearing mechanism, the disruption in the seismic load path, cracks in walls, and other major damages. In cases of buildings which were realized as repairable the required measurements were made, so that the architectural and structural maps can be prepared. In the next step, the seismic capacity of each building was calculated based on FEMA 356 Guidelines, and then some analyses were performed by reduced strength and stiffness based on FEMA 306 Guidelines. The results of these calculations are given and discussed in detail in this paper.

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