Probabilistic Evaluation of Self-Centering Birocking Walls Subjected to Far-Field and Near-Field Ground Motions

Dehcheshmeh, Esmaeil Mohammadi; Broujerdian, Vahid

doi:10.1061/(asce)st.1943-541x.0003435

Cited by 12 publications

(2 citation statements)

References 24 publications

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“…It is noteworthy that to guarantee the stability of employed base-rocking walls, the yield strength of the PT tendons (𝑓 , ) were selected in such a way as to protect PT tendons from yielding under the design basis earthquake (DBE) level. To this end, considering the recommendations given by Dehcheshmeh, et al [30] and Jafari, et al [31], the wall panel rotation was assumed rigid beyond DLS and the elongation of PT tendons was calculated at 2% base rotation and compared to the PT tendons' yielding strain. As mentioned earlier, columns were pinned at the foundation to induce the soft-story failure mechanism and did not carry moment.…”

Section: Selected Retrofitted Scenariosmentioning

confidence: 99%

Post-repair seismic assessment of steel MRFs prone to soft-story mechanisms using rocking walls: cost-performance analysis

Dehcheshmeh,

Ahmadi,

Broujerdian

et al. 2024

Preprint

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Coupling a rocking wall with a moment-resisting frame (MRF) is a viable and practical solution to mitigate the risk of soft-story mechanisms. However, little research has been conducted to investigate the retrofitted MRFs’ post-repair performance and the cost-performance of intervention. This research conducted a numerical parametric study to assess the cost-effectiveness of the retrofitting approach and shed light on the seismic performance of the retrofitted frames. To this end, three steel benchmark MRFs (i.e., three-, six-, and nine-floor height implicitly representing low-, mid- and relatively high-rise buildings, respectively) were selected, and pinned constraints were applied to the end of frames columns to induce the soft-story mechanism. Through coupling a base-rocking wall to the benchmark MRFs, thirteen different retrofitted scenarios were created considering different height and stiffness for the wall. Risk and performance assessment and seismic fragility analysis of the retrofitted scenarios were conducted by performing pushover and incremental dynamic analysis. The cost of retrofitting was estimated for each scenario, and a performance index was introduced to evaluate the efficiency of retrofitting intervention and, after that, to conduct a cost-performance analysis. The results showed that the retrofitting approach considerably decreases residual drift, especially in low-rise buildings. The best performance was achieved in low-rise buildings, and the retrofitting efficiency decreased by increasing the building’s height. Increasing the attached wall’s height has a stronger effect on reducing the retrofitted scenarios’ collapse probability. Besides, increasing the height of the attached wall has a more pronounced effect than stiffness in improving the safety and inter-story drift uniformity of retrofitted scenarios. In terms of performance, for low-rise buildings, employing a less stiff wall leads to a better result, although for mid- and high-rise buildings, scenarios with longer and stiffer wall greatly outperform others. In terms of cost-effectiveness, using a shorter and less stiff wall outperforms other scenarios by a large margin.

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Section: Selected Retrofitted Scenariosmentioning

confidence: 99%

Post-repair seismic assessment of steel MRFs prone to soft-story mechanisms using rocking walls: cost-performance analysis

Dehcheshmeh,

Ahmadi,

Broujerdian

et al. 2024

Preprint

Self Cite

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“…As such, MCE ground motions would result in a comparatively smaller probability of collapse. As defined in the following equation, the collapse margin ratio, CMR, is the ratio of the median 5%-damped spectral acceleration of the collapse level ground motions, Ŝ CT , to the 5%-damped spectral acceleration of the MCE ground motions, S MT , at the fundamental period of the seismic-force-resisting system [48]:…”

Section: Collapse Margin Ratiomentioning

confidence: 99%

Seismic performance assessment of intermediate moment-resisting steel frames designed based on misidentified site soil classes

2023

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This research aims to investigate the extent that an incorrect assumption for soil type may endanger the seismic safety of moment-resisting steel frame structures using probabilistic assessment. To this aim, first, a set of moment-resisting steel frame structures were designed for the site soil class C. The examined structures were 3-, 6-, and 9-storey designed by CSI ETABS software according to ASCE7-16. Then, assuming that the actual soil type had been B, C, or D, seismic vulnerability assessments were performed using OpenSees software. For this purpose, a two-dimensional model of each structure was undergone the incremental nonlinear dynamic analysis (IDA) subjected to far-field, near-field (with pulse), and near-field (without pulse) ground motions of FEMA-P695. The fragility curves were developed for each model under each ground motion record type and accordingly the collapse margin ratio for each model was calculated. The results indicated that within the LS performance level at S a(Design) , site soil class B decreases the exceedance probability slightly but site soil class D tends to increase the exceedance probability significantly, especially as the height increases. Furthermore, it was found that the soil-structure interaction (SSI) has a negligible effect on the collapse margin ratio in all the investigated models.

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Introducing a base-rocking dual-core braced-frame system equipped with vertical buckling-restrained fuses

Ebrahimi Majumerd,

Mohammadi Dehcheshmeh,

Broujerdian

et al. 2023

Bull Earthquake Eng

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Probabilistic Evaluation of Self-Centering Birocking Walls Subjected to Far-Field and Near-Field Ground Motions

Cited by 12 publications

References 24 publications

Post-repair seismic assessment of steel MRFs prone to soft-story mechanisms using rocking walls: cost-performance analysis

Post-repair seismic assessment of steel MRFs prone to soft-story mechanisms using rocking walls: cost-performance analysis

Seismic performance assessment of intermediate moment-resisting steel frames designed based on misidentified site soil classes

Introducing a base-rocking dual-core braced-frame system equipped with vertical buckling-restrained fuses

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