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Seismic robustness assessment of steel moment resisting frames employing material uncertainty incorporated incremental dynamic analysis
Abstract Seismic robustness can be a useful tool to evaluate the structural system capacity to withstand seismic damages. Robust structures can minimize their vulnerability to the progression of damages (extensive) and thereby prevent or avert the collapse risk in the event of seismic shocks. Neglecting the effect of topology, the structural robustness can be reduced to the function of seismic record and material properties. It can be taken as the ratio of mean annual frequency of exceeding a given limit state of interest considering record variability alone and the mean annual frequency of exceeding the given limit state of interest incorporating record as well as material uncertainty. The present study attempts to quantify the seismic robustness of 4-storey and 8-storey moment-resisting frames in terms of the above two mean annual frequency of exceeding the given limit state of interest. Based on the past research reports, a 10% Inter-storey Drift Ratio, IDR where transient drift is competent to permanent drift is considered as the collapse limit state of interest for the investigation. The study buildings are modeled in the OpenSees platform and Incremental Dynamic Analyses, IDA of the adopted structures for the selected suite of ground motion records coming under various hazard levels are carried out. IDA curves, which relate the normalized seismic Intensity Measure, IM and maximum IDR, IDA curve derived fragility curves, robustness parameter, and correction for response reduction factor are presented for the given intensity hazard level.
Highlights The concept of seismic robustness (in terms of Uncertainty Robustness Index) of steel moment resisting frames considering material variability is explored. The material uncertainty incorporated Incremental Dynamic Analysis is utilized to obtain the Uncertainty Robustness Index (as the ratio of mean annual frequency of exceedance under seismic record variability alone and record as well as material variability cases). Material uncertainty incorporated Incremental Dynamic Analysis derived median and dispersions utilized collapse fragility curves are developed crorresposing to record varaibaility alone and both record as well as material variability cases. Correction factors for design response reduction factors are obtained as a function of Uncertainty Robustness Index for low, medium and severe cases of seismic levels to improve the seismic robustness of the study frames.
Seismic robustness assessment of steel moment resisting frames employing material uncertainty incorporated incremental dynamic analysis
Abstract Seismic robustness can be a useful tool to evaluate the structural system capacity to withstand seismic damages. Robust structures can minimize their vulnerability to the progression of damages (extensive) and thereby prevent or avert the collapse risk in the event of seismic shocks. Neglecting the effect of topology, the structural robustness can be reduced to the function of seismic record and material properties. It can be taken as the ratio of mean annual frequency of exceeding a given limit state of interest considering record variability alone and the mean annual frequency of exceeding the given limit state of interest incorporating record as well as material uncertainty. The present study attempts to quantify the seismic robustness of 4-storey and 8-storey moment-resisting frames in terms of the above two mean annual frequency of exceeding the given limit state of interest. Based on the past research reports, a 10% Inter-storey Drift Ratio, IDR where transient drift is competent to permanent drift is considered as the collapse limit state of interest for the investigation. The study buildings are modeled in the OpenSees platform and Incremental Dynamic Analyses, IDA of the adopted structures for the selected suite of ground motion records coming under various hazard levels are carried out. IDA curves, which relate the normalized seismic Intensity Measure, IM and maximum IDR, IDA curve derived fragility curves, robustness parameter, and correction for response reduction factor are presented for the given intensity hazard level.
Highlights The concept of seismic robustness (in terms of Uncertainty Robustness Index) of steel moment resisting frames considering material variability is explored. The material uncertainty incorporated Incremental Dynamic Analysis is utilized to obtain the Uncertainty Robustness Index (as the ratio of mean annual frequency of exceedance under seismic record variability alone and record as well as material variability cases). Material uncertainty incorporated Incremental Dynamic Analysis derived median and dispersions utilized collapse fragility curves are developed crorresposing to record varaibaility alone and both record as well as material variability cases. Correction factors for design response reduction factors are obtained as a function of Uncertainty Robustness Index for low, medium and severe cases of seismic levels to improve the seismic robustness of the study frames.
Seismic robustness assessment of steel moment resisting frames employing material uncertainty incorporated incremental dynamic analysis
Pandikkadavath, Muhamed Safeer (author) / Shaijal, K.M. (author) / Mangalathu, Sujith (author) / Davis, Robin (author)
2022-02-13
Article (Journal)
Electronic Resource
English
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