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Seismic fragility evaluation of semi-rigid frames subjected to near-field earthquakes
Abstract The studies on the seismic fragility evaluation of semi-rigid (SR) steel moment frames are meager in the existing literature. The purpose of the present numerical study is to investigate the seismic fragility of SR frames subjected to near-field earthquakes. Specific characteristics of the fragility curves for near-field earthquakes are highlighted by comparing them with those for far-field earthquakes. A ten-story SR frame is analyzed subjected to four sets of earthquakes considering the moderate degree of semi-rigidity. The four sets of earthquakes, namely, far-field, near-field with high directivity, low directivity, and fling-step consist of ensembles of ten real ground motion records in each ensemble. The fragility plots are developed by considering a number of damage measures, namely, the maximum inter-story drift ratio, maximum base shear, maximum roof drift angle, maximum top-story acceleration with the peak ground acceleration (PGA) as an intensity measure. Threshold values for different damage states are decided based on the engineering judgment. For the near-field earthquake with directivity effect, the frequency repercussions on the fragility curves are investigated by varying the peak ground velocity (PGV) to PGA ratio with high ( > 160 cm/s-g), and low (< 160 cm/s-g) ratios. The major findings of the numerical study show that a high directivity ratio of the near-field earthquake has a significant effect on the probability of exceedance as compared to the far-field earthquake.
Graphical abstract Display Omitted
Highlights Fragility evaluation of semi-rigid steel frames. Effect of PGV to PGA ratio in near-field directivity earthquakes. Identification of different damage states under near-field earthquakes.
Seismic fragility evaluation of semi-rigid frames subjected to near-field earthquakes
Abstract The studies on the seismic fragility evaluation of semi-rigid (SR) steel moment frames are meager in the existing literature. The purpose of the present numerical study is to investigate the seismic fragility of SR frames subjected to near-field earthquakes. Specific characteristics of the fragility curves for near-field earthquakes are highlighted by comparing them with those for far-field earthquakes. A ten-story SR frame is analyzed subjected to four sets of earthquakes considering the moderate degree of semi-rigidity. The four sets of earthquakes, namely, far-field, near-field with high directivity, low directivity, and fling-step consist of ensembles of ten real ground motion records in each ensemble. The fragility plots are developed by considering a number of damage measures, namely, the maximum inter-story drift ratio, maximum base shear, maximum roof drift angle, maximum top-story acceleration with the peak ground acceleration (PGA) as an intensity measure. Threshold values for different damage states are decided based on the engineering judgment. For the near-field earthquake with directivity effect, the frequency repercussions on the fragility curves are investigated by varying the peak ground velocity (PGV) to PGA ratio with high ( > 160 cm/s-g), and low (< 160 cm/s-g) ratios. The major findings of the numerical study show that a high directivity ratio of the near-field earthquake has a significant effect on the probability of exceedance as compared to the far-field earthquake.
Graphical abstract Display Omitted
Highlights Fragility evaluation of semi-rigid steel frames. Effect of PGV to PGA ratio in near-field directivity earthquakes. Identification of different damage states under near-field earthquakes.
Seismic fragility evaluation of semi-rigid frames subjected to near-field earthquakes
Sharma, Vijay (author) / Shrimali, Mahendra Kumar (author) / Bharti, Shiv Dayal (author) / Datta, Tushar Kanti (author)
2020-09-23
Article (Journal)
Electronic Resource
English
Semi-rigid steel frame , NTHA , IDA , Near-field , High and low directivity , Probability of exceedance, fragility , α , Stiffness parameter for semi-rigid connection , <italic>λ</italic> , Strength parameter for the semi-rigid connection , <italic>β</italic> <inf><italic>T</italic></inf> , Total Uncertainty , <italic>γ</italic> , PGV to PGA ratio , <italic>Ψ</italic> <inf><italic>max</italic></inf> , Maximum Roof Drift angle , <italic>BS</italic> <inf><italic>max</italic></inf> , Maximum base shear , DM , Damage Measures , EQ_FF , Far-field earthquake , EQ_NF-LD , Near-field with directivity earthquake with low PGV to PGA ratio , EQ_NF-HD , Near-field with directivity earthquake with high PGV to PGA ratio , EQ_NF-FS , Near-field with fling-step effect , EDP , Engineering Demand Parameters , IM , Intensity Measure , <italic>IDR</italic> <inf><italic>max</italic></inf> , Maximum inter-story drift ratio , MRF , Moment-resisting frame , Nonlinear time history analysis , SR , Semi-rigid , <italic>TSA</italic> <inf><italic>max</italic></inf> , Maximum value of top story acceleration
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