A SENSITIVITY ANALYSIS FOR ENHANCING IDA EFFICIENCY IN FRAGILITY ANALYSIS OF ۳D REINFORCED CONCRETE FRAMES
- سال انتشار: 1395
- محل انتشار: مجله بهینه سازی در مهندسی عمران، دوره: 6، شماره: 4
- کد COI اختصاصی: JR_IJOCE-6-4_010
- زبان مقاله: انگلیسی
- تعداد مشاهده: 54
نویسندگان
چکیده
Due to several uncertainties which affect structural responses of Reinforced concrete (RC) frames, it is sensibly required to apply a vulnerability analysis tool such as fragility curve. To construct an analytical fragility curve, the incremental dynamic analysis (IDA) method has been extensively used as an applicable seismic analysis tool. To employ the IDA method for constructing fragility curves of RC frames, it is important to know how many records will be adequate to assess seismic risk analysis properly? Another issue is to know how many IDA steps are required for developing an accurate fitted fragility function? For this purpose, two ۳D RC frames called ۳STRCF and ۵STRCF have been nonlinearly modeled and ۲۰۰ ۲-componets actual records have been considered for the IDA. The results reveal that at least ۱۵ IDA steps are required to reduce fragility function error to less than ۵% and ۱۰ IDA steps are required to yield less than ۱۰% error. In addition, it is revealed that a selection of ۱۰۰ records is completely adequate to be certain to have an accurate fragility curve. It is concluded that at least ۲۵ records are required to decrease fragility curve error to less than ۵% and ۱۵ records to have less than ۱۰%. The closeness of fragility curve error variation for two models and in all limit states show that these results can be generalized to other RC frames.کلیدواژه ها
Analytical fragility curve, Incremental dynamic analysis, Error estimation, Reinforced concrete frames.اطلاعات بیشتر در مورد COI
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