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Effects and Implications of Longitudinal Reinforcing Steel Bar Fracture Due to Low-Cycle Fatigue on Reinforced Concrete Shear Walls Performance and Post-Earthquake Safety
Effects and Implications of Longitudinal Reinforcing Steel Bar Fracture Due to Low-Cycle Fatigue on Reinforced Concrete Shear Walls Performance and Post-Earthquake Safety
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105624
- ISBN
- 9798265429391
- DDC
- 551.22
- 서명/저자
- Effects and Implications of Longitudinal Reinforcing Steel Bar Fracture Due to Low-Cycle Fatigue on Reinforced Concrete Shear Walls Performance and Post-Earthquake Safety
- 발행사항
- [Sl] : Stanford University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 307 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Deierlein, Gregory.
- 학위논문주기
- Thesis (Ph.D.)--Stanford University, 2025.
- 초록/해제
- 요약Reinforced concrete (RC) shear wall buildings are widely used in seismic regions, yet current assessment frameworks often fail to robustly capture degradation mechanisms such as low-cycle fatigue (LCF) induced fracture of longitudinal reinforcement, a failure mode documented in recent earthquakes. This dissertation develops a simulation-based methodology that integrates a validated Reinforcement Ductile Fracture Model (RDFM) into nonlinear dynamic analysis to explicitly simulate bar fracture in RC walls. A key parameter of the RDFM, the equivalent slenderness factor, is calibrated to a set of 23 tests, and a predictive model is proposed.The methodology is applied to code-conforming 8-, 12-, and 20-story archetype buildings designed for Los Angeles and San Francisco and evaluated using hazard-consistent assessment methods including Multiple Stripe Analysis (MSA) and the Site-Specific Adjustment Framework for Incremental Dynamic Analysis (SAF-IDA). Results reveal that LCF fracture significantly alters collapse fragilities, particularly under long-duration ground motions. Prescriptive mid-rise designs (8- and 12-story) exhibited probabilities of collapse at the risk-targeted Maximum Considered Earthquake (MCER) level that exceeded ASCE 7-22 safety limits, with mean annual frequencies of collapse above the 2x10⁻⁴ per year threshold once fracture was modeled.Beyond collapse safety, a novel probabilistic framework is introduced to quantify post-earthquake degradation, combining Bayesian inference with sequential ground motion analysis. A structural safety degradation metric, kappa, captures the conditional collapse risk given prior shaking, enabling direct evaluation of residual safety and informing reoccupancy decisions. Results show that even when collapse safety targets were nominally satisfied, degradation fragilities indicated critical residual safety loss at substantially lower intensities.(e.g., Sκcrit a ≈ 0.82 g for the 12-story and 0.38 g for the 20-story, compared to collapse medians of 1.55 g and 0.98 g). This defines a residual safety gap: buildings may remain standing but lack adequate residual capacity for reoccupancy.Across archetypes, κ-α curves converged to nearly identical strain thresholds (0.006-0.01), demonstrating that moderate reinforcement strains consistently signal transition into a degraded system state. These thresholds provide a probabilistic, system-level alternative to conventional heuristic limits, offering a robust basis for both reoccupancy screening and resilience-oriented design.In summary, this dissertation demonstrates that compliance with prescriptive design checks does not guarantee collapse safety or resilience once fracture and degradation are considered. By embedding fracture simulation, degradation fragilities, and strain-based thresholds into hazard-consistent evaluation, it advances performancebased earthquake engineering toward a resilience-oriented paradigm-enabling explicit modeling of fatigue-induced damage, quantification of safety loss under repeated seismic demands, and integration of degradation-aware metrics into design and postearthquake decision-making.
- 일반주제명
- Earthquakes
- 일반주제명
- Concrete
- 일반주제명
- Metal fatigue
- 일반주제명
- Materials science
- 기타저자
- Stanford University.
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■007cr#unu||||||||
■020 ▼a9798265429391
■035 ▼a(MiAaPQ)AAI32316533
■035 ▼a(MiAaPQ)Stanfordmy842vn0510
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a551.22
■1001 ▼aCarranza, Juan Miguel Navarro.
■24510▼aEffects and Implications of Longitudinal Reinforcing Steel Bar Fracture Due to Low-Cycle Fatigue on Reinforced Concrete Shear Walls Performance and Post-Earthquake Safety
■260 ▼a[Sl]▼bStanford University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a307 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Deierlein, Gregory.
■5021 ▼aThesis (Ph.D.)--Stanford University, 2025.
■520 ▼aReinforced concrete (RC) shear wall buildings are widely used in seismic regions, yet current assessment frameworks often fail to robustly capture degradation mechanisms such as low-cycle fatigue (LCF) induced fracture of longitudinal reinforcement, a failure mode documented in recent earthquakes. This dissertation develops a simulation-based methodology that integrates a validated Reinforcement Ductile Fracture Model (RDFM) into nonlinear dynamic analysis to explicitly simulate bar fracture in RC walls. A key parameter of the RDFM, the equivalent slenderness factor, is calibrated to a set of 23 tests, and a predictive model is proposed.The methodology is applied to code-conforming 8-, 12-, and 20-story archetype buildings designed for Los Angeles and San Francisco and evaluated using hazard-consistent assessment methods including Multiple Stripe Analysis (MSA) and the Site-Specific Adjustment Framework for Incremental Dynamic Analysis (SAF-IDA). Results reveal that LCF fracture significantly alters collapse fragilities, particularly under long-duration ground motions. Prescriptive mid-rise designs (8- and 12-story) exhibited probabilities of collapse at the risk-targeted Maximum Considered Earthquake (MCER) level that exceeded ASCE 7-22 safety limits, with mean annual frequencies of collapse above the 2x10⁻⁴ per year threshold once fracture was modeled.Beyond collapse safety, a novel probabilistic framework is introduced to quantify post-earthquake degradation, combining Bayesian inference with sequential ground motion analysis. A structural safety degradation metric, kappa, captures the conditional collapse risk given prior shaking, enabling direct evaluation of residual safety and informing reoccupancy decisions. Results show that even when collapse safety targets were nominally satisfied, degradation fragilities indicated critical residual safety loss at substantially lower intensities.(e.g., Sκcrit a ≈ 0.82 g for the 12-story and 0.38 g for the 20-story, compared to collapse medians of 1.55 g and 0.98 g). This defines a residual safety gap: buildings may remain standing but lack adequate residual capacity for reoccupancy.Across archetypes, κ-α curves converged to nearly identical strain thresholds (0.006-0.01), demonstrating that moderate reinforcement strains consistently signal transition into a degraded system state. These thresholds provide a probabilistic, system-level alternative to conventional heuristic limits, offering a robust basis for both reoccupancy screening and resilience-oriented design.In summary, this dissertation demonstrates that compliance with prescriptive design checks does not guarantee collapse safety or resilience once fracture and degradation are considered. By embedding fracture simulation, degradation fragilities, and strain-based thresholds into hazard-consistent evaluation, it advances performancebased earthquake engineering toward a resilience-oriented paradigm-enabling explicit modeling of fatigue-induced damage, quantification of safety loss under repeated seismic demands, and integration of degradation-aware metrics into design and postearthquake decision-making.
■590 ▼aSchool code: 0212.
■650 4▼aEarthquakes
■650 4▼aConcrete
■650 4▼aMetal fatigue
■650 4▼aMaterials science
■690 ▼a0794
■71020▼aStanford University.
■7730 ▼tDissertations Abstracts International▼g87-05B.
■790 ▼a0212
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360821▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


