Evaluating the Behaviour Factor of Medium Ductile SMRF Structures

Yahmi, Djamal; Branci, Taïeb; Bouchaïr, Abdelhamid; Fournely, Éric

doi:10.3311/ppci.10419

Cited by 6 publications

(5 citation statements)

References 25 publications

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“…The corrected R value with respect to the earthquake series was found to have a lower value compared to the designed R (Abdollahzadeh and Sadeghi 2018). In a study, the effects of story height and column/ beam capacity ratio on behavior factor (q) were calculated for steel special moment resisting frames, with the results showing the q factor suggested by Eurocode-8 to be underestimated for low-rise structures (Yahmi et al, 2018). A study was conducted to find the effect of pf bracing system arrangement on R factor by performing non-linear pushover analysis, with the arrangement of bracing/shear walls at alternate bays showing an increased R factor (Tamboli and Amin, 2015).…”

Section: Introductionmentioning

confidence: 99%

Role of resilience in selection of R factors for an RC building

Prasanth

Ghosh

2022

Front. Built Environ.

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In the seismic design of a reinforced concrete building, selecting appropriate response reduction factor (R) is vital for the building’s seismic response. Indian Standard (IS) 1893-2016 provides R values of 3 and 5 for ordinary moment resisting frames and special moment resisting frames, respectively. As R factors are used to incorporate the building’s non-linearity, R factor selection should be based on the building’s performance in terms of resilience. Since IS does not provide any clause on the background for selecting R factors for the design aspects, the study emphasizes the appropriate selection of R factors with respect to a building’s functionality, performance level, and resilience. In this study, a high-rise building was designed with various R factors (R = 3, 4, 5, and 6). To estimate the building’s functionality, five different recovery paths (RP-1 to RP-5), which match the real scenario, were used. The response of the building in each case was observed at two design levels, Design Basic Earthquake (DBE) level and MCE level. Variations in ductility demand, performance level, and resilience for each building case at each design level were observed. The R factor was used to obtain lateral design force at the DBE level by reducing the actual base shear placed on the structure. The reduction in the lateral design force with maximum R yielded high ductility demand and high loss of resilience. The result shows that the considered building can be designed with a maximum R of 6 since its resilience is almost 50%; hence, recovery is possible at a high cost. The performance level of the building at R = 6 lies at CP-C for the MCE design level. Considering the building’s resilience and performance level aspects, the maximum R factor was found to be 6. This helps the stakeholder and designer in the selection of R, based on the requirements of building functionality, performance level, and resilience.

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Section: Introductionmentioning

confidence: 99%

Role of resilience in selection of R factors for an RC building

Prasanth

Ghosh

2022

Front. Built Environ.

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“…The revised response reduction factor (R) value with regard to the earthquake series was discovered [5]. The conclusion shows that the adjusted R is less than the intended R. In a study by Djamal Yahmi et al [6] to determine the impact of storey height and column/beam capacity ratio on behaviour factor (q) for steel special moment resistant frame (SMRF), it was discovered that the low-rise construction q factor recommended by Eurocode-8 is too low. By using non-linear pushover analysis, Kruti Tamboli and Amin.…”

Section: Introductionmentioning

confidence: 99%

Selection of Response Reduction Factor Considering Resilience Aspect

et al. 2023

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The selection of an adequate response reduction factor (R) in the seismic design of a reinforced concrete building is critical to the building’s seismic response. To construct a robust structure, the R factor should be chosen based on the building’s resilience performance. Since no background was provided for the selection of R factors, the study focuses on the right selection of R factors in relation to the building’s functionality, performance level, and resilience. In this study, a high-rise building with multiple R factors (R = 3, 4, 5, and 6) is developed. Five potential recovery paths (RP-1 to RP-5) that matched the realistic scenario were used to estimate the building’s functionality. The building was subjected to uni and bi-directional loadings, and two design levels, Design Basic Earthquake (DBE) and Maximum Considered Earthquake were used to monitor the building’s response. According to the findings, a decrease in the lateral design force with the highest R results in a high ductility requirement and a substantial loss of resilience. The maximum R factor can be recommended under uni-directional loading up to 6, in which the building’s resilience is almost 50%, whereas under bi-directional loading and taking the recommended R factor decreased from 6 to 4.

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“…According to Indian Standards [4], the reported R factor is remarkably higher than the actual scenario. Regarding the earthquake series, an updated R factor value was proposed [5], and the analysis findings demonstrated that the adjusted R is lower than the desired R. The behaviour factor (q), which is the European factor equivalent to R in Indian Standards, for steel special moment resisting frames (SMRF) proposed by Eurocode 8 for low-rise buildings, was found to be inadequate to ascertain the effects of the storey height and of the column to beam capacity ratios [6]. Tamboli and Amin [7] performed a non-linear pushover analysis to determine how the bracing system configuration may affect the R factor, finding that the latter increased by placing bracing/shear walls in different bays.…”

Section: Introductionmentioning

confidence: 99%

Accounting for Resilience in the Selection of R Factors for a RC Unsymmetrical Building

et al. 2023

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Several design codes consider the non-linear response of a building by using one of the most important seismic parameters, called the response reduction factor (R). The lack of a detailed description of the R factor selection creates the need for a deeper study. This paper emphasises a methodology for the selection of a proper R factor based on resilience aspects. Unsymmetrical/irregular buildings have become the most common in recent times due to aesthetic purposes. However, because of the complexity due to the torsional effect, the selection of the R factor is even more difficult for this type of building. Therefore, a high-rise G+10-storey L-shaped building is herein considered. The building has re-entrant corners based on the structural/plan arrangement. Different R factors were used in the building design, considering buildings subjected to both unidirectional and bidirectional seismic loading scenarios. The building response with respect to various R factors (R equal to 3, 4, 5 and 6) in terms of its performance level, functionality, damage ratio and resilience was assessed at two design levels, i.e., design basic earthquake (DBE) and maximum considered earthquake (MCE). The study concludes that, considering the above criteria along with the resilience aspect, a maximum R factor up to 4 can be recommended for unidirectional loading, whereas for bidirectional loading, the maximum recommended R factor is 3.

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Evaluating the Behaviour Factor of Medium Ductile SMRF Structures

Cited by 6 publications

References 25 publications

Role of resilience in selection of R factors for an RC building

Role of resilience in selection of R factors for an RC building

Selection of Response Reduction Factor Considering Resilience Aspect

Accounting for Resilience in the Selection of R Factors for a RC Unsymmetrical Building

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