Pushover-based probabilistic seismic capacity assessment of RCFs retrofitted with PBSPC BRBF sub-structures

•A new type of external retrofitting sub-structure combining the system-level upgrading and precast-assembly technology.•An efficient numerical model based on OpenSees verified by the experiments.•Three span-story RCFs (low, medium, high), three retrofitting scenarios (full, odd, even), and three fo...

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Veröffentlicht in:Engineering structures 2021-05, Vol.234, p.111919, Article 111919
Hauptverfasser: Cao, Xu-Yang, Feng, De-Cheng, Wu, Gang
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description •A new type of external retrofitting sub-structure combining the system-level upgrading and precast-assembly technology.•An efficient numerical model based on OpenSees verified by the experiments.•Three span-story RCFs (low, medium, high), three retrofitting scenarios (full, odd, even), and three force patterns (CF, TF, UF).•A pushover-based PSCA procedure for the sub-structure considering uncertainty.•Recommendations of average median thresholds and logarithmic standard deviations for SD, MD, ED and CP states.•Sensitivity evaluation and comparison of uncertain factors for the PSCA results. A new external retrofitting sub-structure is introduced in this paper, namely, precast bolt-connected steel-plate reinforced concrete buckling-restrained-brace-frame (PBSPC BRBF). The numerical model is proposed considering the joint mechanical behavior, postcast concrete effects, and interfacial shear performance, and the results are validated via an experimental study. The probabilistic seismic capacity assessments (PSCAs) are performed on the deficient reinforced concrete frames (RCFs) retrofitted with PBSPC BRBFs based on a pushover method. The structural and load uncertainties (e.g., the material parameter and load value) are analyzed, and the Latin hypercube sampling (LHS) method is adopted for the 1-span-3-story, 3-span-6-story and 5-span-8-story frames, respectively. The histograms, probability density functions (PDFs) and PSCA curves for all conditions are provided, and the average median values or logarithmic standard deviations (SDs) are recommended. The sensitivity analysis is also performed, and the tornado diagrams and stack columns are presented. The research provides the thresholds of damage measures for different limit states of the RCFs retrofitted with the external sub-structures, and the corresponding conclusions can be further combined with probabilistic seismic demand analyses to constitute the integrated fragility framework.
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A new external retrofitting sub-structure is introduced in this paper, namely, precast bolt-connected steel-plate reinforced concrete buckling-restrained-brace-frame (PBSPC BRBF). The numerical model is proposed considering the joint mechanical behavior, postcast concrete effects, and interfacial shear performance, and the results are validated via an experimental study. The probabilistic seismic capacity assessments (PSCAs) are performed on the deficient reinforced concrete frames (RCFs) retrofitted with PBSPC BRBFs based on a pushover method. The structural and load uncertainties (e.g., the material parameter and load value) are analyzed, and the Latin hypercube sampling (LHS) method is adopted for the 1-span-3-story, 3-span-6-story and 5-span-8-story frames, respectively. The histograms, probability density functions (PDFs) and PSCA curves for all conditions are provided, and the average median values or logarithmic standard deviations (SDs) are recommended. The sensitivity analysis is also performed, and the tornado diagrams and stack columns are presented. The research provides the thresholds of damage measures for different limit states of the RCFs retrofitted with the external sub-structures, and the corresponding conclusions can be further combined with probabilistic seismic demand analyses to constitute the integrated fragility framework.</description><identifier>ISSN: 0141-0296</identifier><identifier>EISSN: 1873-7323</identifier><identifier>DOI: 10.1016/j.engstruct.2021.111919</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Columns (structural) ; Concrete ; Earthquake damage ; External retrofitting ; Fragility ; Histograms ; Hypercubes ; Latin hypercube sampling ; Limit states ; Mathematical models ; Mechanical properties ; Numerical models ; Probabilistic ; Probability density functions ; Probability theory ; PSCA ; Reinforced concrete ; Reinforcing steels ; Retrofitting ; Sensitivity ; Sensitivity analysis ; Statistical analysis ; Steel plates ; Sub-structure ; Tornadoes ; Uncertainty</subject><ispartof>Engineering structures, 2021-05, Vol.234, p.111919, Article 111919</ispartof><rights>2021 Elsevier Ltd</rights><rights>Copyright Elsevier BV May 1, 2021</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c343t-f19d9137b9cabe020133ab9e3be3e8029d21858d4a3c9e4e946ef7ffa33fef3a3</citedby><cites>FETCH-LOGICAL-c343t-f19d9137b9cabe020133ab9e3be3e8029d21858d4a3c9e4e946ef7ffa33fef3a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.engstruct.2021.111919$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Cao, Xu-Yang</creatorcontrib><creatorcontrib>Feng, De-Cheng</creatorcontrib><creatorcontrib>Wu, Gang</creatorcontrib><title>Pushover-based probabilistic seismic capacity assessment of RCFs retrofitted with PBSPC BRBF sub-structures</title><title>Engineering structures</title><description>•A new type of external retrofitting sub-structure combining the system-level upgrading and precast-assembly technology.•An efficient numerical model based on OpenSees verified by the experiments.•Three span-story RCFs (low, medium, high), three retrofitting scenarios (full, odd, even), and three force patterns (CF, TF, UF).•A pushover-based PSCA procedure for the sub-structure considering uncertainty.•Recommendations of average median thresholds and logarithmic standard deviations for SD, MD, ED and CP states.•Sensitivity evaluation and comparison of uncertain factors for the PSCA results. A new external retrofitting sub-structure is introduced in this paper, namely, precast bolt-connected steel-plate reinforced concrete buckling-restrained-brace-frame (PBSPC BRBF). The numerical model is proposed considering the joint mechanical behavior, postcast concrete effects, and interfacial shear performance, and the results are validated via an experimental study. The probabilistic seismic capacity assessments (PSCAs) are performed on the deficient reinforced concrete frames (RCFs) retrofitted with PBSPC BRBFs based on a pushover method. The structural and load uncertainties (e.g., the material parameter and load value) are analyzed, and the Latin hypercube sampling (LHS) method is adopted for the 1-span-3-story, 3-span-6-story and 5-span-8-story frames, respectively. The histograms, probability density functions (PDFs) and PSCA curves for all conditions are provided, and the average median values or logarithmic standard deviations (SDs) are recommended. The sensitivity analysis is also performed, and the tornado diagrams and stack columns are presented. The research provides the thresholds of damage measures for different limit states of the RCFs retrofitted with the external sub-structures, and the corresponding conclusions can be further combined with probabilistic seismic demand analyses to constitute the integrated fragility framework.</description><subject>Columns (structural)</subject><subject>Concrete</subject><subject>Earthquake damage</subject><subject>External retrofitting</subject><subject>Fragility</subject><subject>Histograms</subject><subject>Hypercubes</subject><subject>Latin hypercube sampling</subject><subject>Limit states</subject><subject>Mathematical models</subject><subject>Mechanical properties</subject><subject>Numerical models</subject><subject>Probabilistic</subject><subject>Probability density functions</subject><subject>Probability theory</subject><subject>PSCA</subject><subject>Reinforced concrete</subject><subject>Reinforcing steels</subject><subject>Retrofitting</subject><subject>Sensitivity</subject><subject>Sensitivity analysis</subject><subject>Statistical analysis</subject><subject>Steel plates</subject><subject>Sub-structure</subject><subject>Tornadoes</subject><subject>Uncertainty</subject><issn>0141-0296</issn><issn>1873-7323</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNqFkM1OwzAQhC0EEqXwDFjinOKNQxMf24oCUiUqfs6W46zBpW2K1yni7XEVxJXLzmVndudj7BLECASMr1cj3L5RDJ2No1zkMAIABeqIDaAqZVbKXB6zgYACMpGr8Sk7I1oJIfKqEgP2sezovd1jyGpD2PBdaGtT-7Wn6C0n9LRJas3OWB-_uSFCog1uI28df5rNiQeMoXU-xuT-8vGdL6fPyxmfPk3nnLo661_rAtI5O3FmTXjxq0P2Or99md1ni8e7h9lkkVlZyJg5UI0CWdbKmhpFLkBKUyuUNUqsUocmh-qmagojrcICVTFGVzpnpHTopJFDdtXnpjKfHVLUq7YL23RS5zeQkssqzSEr-y0bWqKATu-C35jwrUHoA1m90n9k9YGs7skm56R3Yiqx9xg0WY9bi40PmHab1v-b8QO3zIgp</recordid><startdate>20210501</startdate><enddate>20210501</enddate><creator>Cao, Xu-Yang</creator><creator>Feng, De-Cheng</creator><creator>Wu, Gang</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7ST</scope><scope>8BQ</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>JG9</scope><scope>KR7</scope><scope>SOI</scope></search><sort><creationdate>20210501</creationdate><title>Pushover-based probabilistic seismic capacity assessment of RCFs retrofitted with PBSPC BRBF sub-structures</title><author>Cao, Xu-Yang ; 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A new external retrofitting sub-structure is introduced in this paper, namely, precast bolt-connected steel-plate reinforced concrete buckling-restrained-brace-frame (PBSPC BRBF). The numerical model is proposed considering the joint mechanical behavior, postcast concrete effects, and interfacial shear performance, and the results are validated via an experimental study. The probabilistic seismic capacity assessments (PSCAs) are performed on the deficient reinforced concrete frames (RCFs) retrofitted with PBSPC BRBFs based on a pushover method. The structural and load uncertainties (e.g., the material parameter and load value) are analyzed, and the Latin hypercube sampling (LHS) method is adopted for the 1-span-3-story, 3-span-6-story and 5-span-8-story frames, respectively. The histograms, probability density functions (PDFs) and PSCA curves for all conditions are provided, and the average median values or logarithmic standard deviations (SDs) are recommended. The sensitivity analysis is also performed, and the tornado diagrams and stack columns are presented. The research provides the thresholds of damage measures for different limit states of the RCFs retrofitted with the external sub-structures, and the corresponding conclusions can be further combined with probabilistic seismic demand analyses to constitute the integrated fragility framework.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.engstruct.2021.111919</doi></addata></record>
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subjects Columns (structural)
Concrete
Earthquake damage
External retrofitting
Fragility
Histograms
Hypercubes
Latin hypercube sampling
Limit states
Mathematical models
Mechanical properties
Numerical models
Probabilistic
Probability density functions
Probability theory
PSCA
Reinforced concrete
Reinforcing steels
Retrofitting
Sensitivity
Sensitivity analysis
Statistical analysis
Steel plates
Sub-structure
Tornadoes
Uncertainty
title Pushover-based probabilistic seismic capacity assessment of RCFs retrofitted with PBSPC BRBF sub-structures
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