احسان عرفاني مطلق

The damage or destruction of one or more bridges after an earthquake, apart from the direct economic and life losses caused by the bridge damage and damage to the passengers, causes an increase in the damage by disrupting transportation, assistance and relief. In this way, reducing the vulnerability of bridges is very important and has always been considered. In this research, by performing three-dimensional Incremental Dynamic Analysis (IDA) using 80 records on 8 bridges with different characteristics in pier height, number of spans and number of columns at each pier in two situations without isolator and with MRE isolator, reducing the vulnerability of models with isolator in different responses of the bridge by drawing the fragility curve and comparing the mean fragility values. The results of fragility analysis in examining the changes in seismic demand for bridge responses at all damage limit states including slight, moderate, extensive and complete have been eva‎luated in the models, the primary response of the bridge is the column curvature ductility and the secondary response is the active and transverse displacements of the abutment and transverse displacement of the deck. For column curvature ductility, an increase in the mean value of fragility has been observed at all limit states, so that for slight to complete damage states a reduction in the range of 27% to 116%, 19% to 83%, 14% to 48% and 5% to 43% has been obtained for different models respectively. for secondary responses at slight and moderate damage states, a decrease in fragility value has been observed. Models with different characteristics have a variable effect of the presence of the isolator, so that the first response that can bring the bridge system to slight and moderate damage state shows the changes in the mean fragility of value in the range of -58% to 0% and 11% to -48% for different models.

آسيب‌پذيري لرزه‌اي , پل‌ها , جداگر لرزه‌اي , الاستومر مغناطيسي , منحني شكنندگي , تحليل ديناميكي فزاينده

Seismic Vulnerability , Bridges , Seismic Isolator , Magnetorheological Elastomer , Fragility Curve , Incremental Dynamic Analysis

Ehsan Erfani Motlaq

Vahid Broujerdian