Detailed Analyses of Steel and Reinforced Concrete Buildings Damaged by the 2003 Bam Earthquake in Iran

Abstract eng:
Two steel and two reinforced concrete (RC) buildings damaged by the Bam earthquake 0n December 26, 2003 in Iran with magnitude Mw=6.5 is selected for detailed damage evaluation using linear and nonlinear analysis procedures. The recorded ground motion of the Bam station with Peak Ground Acceleration (PGA) of 0.76g in longitudinal (East-West) direction is considered for nonlinear dynamic analyses. Studied buildings had 3, 4 and 5 stories in height, and were located about 5 km in West side of the epicenter. In the case studied RC buildings, the analysis results and also observed damages during the earthquake indicate moderate damages. More detailed evaluations indicate that the RC buildings satisfy the current Iranian building code requirements. However, in the case of steel buildings, sever damage and collapse has been observed. This kind of buildings not satisfies the current Iranian building code requirements. Field investigations show that the main reasons for damages of steel buildings appeared due to the very poor quality of welded construction in seismic resisting elements. Comparison of the analyses and field observations were intended to help identify the causes of the damage, as well as the ability of analytical methods and modeling assumptions to predict damages.

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