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Performance of Ordinary C-Shaped Reinforced Concrete Structural Walls Subjected to Wind and Seismic Loading Protocols
Performance of Ordinary C-Shaped Reinforced Concrete Structural Walls Subjected to Wind an...
Performance of Ordinary C-Shaped Reinforced Concrete Structural Walls Subjected to Wind and Seismic Loading Protocols

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자료유형  
 학위논문 서양
최종처리일시  
20250211152836
ISBN  
9798384092056
DDC  
004
저자명  
Unal, Mehmet Emre.
서명/저자  
Performance of Ordinary C-Shaped Reinforced Concrete Structural Walls Subjected to Wind and Seismic Loading Protocols
발행사항  
[Sl] : University of California, Los Angeles, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
395 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
주기사항  
Advisor: Wallace, John Wright.
학위논문주기  
Thesis (Ph.D.)--University of California, Los Angeles, 2024.
초록/해제  
요약The design of buildings under wind demands has traditionally been based on prescriptive code provisions such as ASCE/SEI 7, which requires the building components to stay essentially linear elastic. Recent developments in wind tunnel testing, structural analysis techniques, and performance-based design procedures led to the publication of the ASCE/SEI Prestandard for Performance-Based Wind Design (ASCE/SEI, 2019). The Prestandard allows limited inelastic behavior in ductile elements of a building's Main Wind Force Resisting System (MWFRS) under extreme wind events. However, because yielding of some building components has not historically been permitted, there is limited research available to understand the inelastic behavior of structural elements subjected to wind demands. The advantages of the performance-based wind design (PBWD) are considered to be most impactful for the design of tall buildings, where it is very common to use coupled reinforced concrete shear wall systems as the MWFRS. Although some research has been conducted to understand the inelastic behavior of reinforced concrete and steel-reinforced concrete coupling beams, there is no published research that investigates the inelastic behavior of reinforced concrete shear walls under wind demands. To fill this gap, four reinforced concrete C-shaped structural walls have been tested in two phases under quasi-static, biaxial cyclic loading protocols simulating extreme wind events. Following the wind loading protocol, a seismic loading protocol was applied.The design of the walls was based on the core-wall design of actual buildings that were designed and constructed in high-wind and low-seismic zones in the United States. The 5 in. thick flanges and webs of the walls were 30 in. and 75 in. long, respectively, representing approximately one-third scaled C-shaped walls of the core-walls of these buildings. The test walls were detailed as Ordinary walls based on the provisions of Chapter 11 of ACI 318-19. The test variable for the Phase-I walls (CW-1 and CW-2) was the longitudinal reinforcement ratio (ρl); 0.75% for CW-1 and 1.5% for CW-2. Based on the experimental results of the Phase-I walls and feedback from a Project Advisory Committee (PAC), two more walls (CW-3 and CW-4) were tested during Phase-II. The design of Phase-II walls was based on CW-2 (ρl=1.5%), and the test variables were the amount of confinement provided at the end zones of the flanges (flange edges) and the amount of axial load applied during the biaxial wind loading protocol. The wind test results indicated that for the wall with the low-to-moderate reinforcement ratio (CW-1, ρl=0.75%), rotational ductility demands of 3.0 can be achieved without any damage (e.g., concrete spalling, bar buckling, or bar fracture) and with very small residual flexural crack widths (around 0.1 mm). Since CW-1 failed at a rotational ductility demand of 20 during the seismic loading protocol, modest inelastic response can be allowed during extreme wind events for the walls with 0.75% or lower longitudinal reinforcement ratios. Concrete spalling was observed at the flange-web corners and the flange edges during the wind loading protocol for the walls with the higher longitudinal reinforcement ratio (1.5%). Depending on the amount of axial load applied during the biaxial load application, concrete crushing and bar buckling were also observed. Phase-II tests showed that the flange edges were more susceptible to damage than the other portions of the C-shaped walls. With moderate confinement provided at the flange edges and reduction in wall axial load during the biaxial loading (when the flange edges were under compression), bar buckling and concrete crushing were not observed during the wind loading protocols. Application of the seismic loading protocol revealed that, for the walls that did not sustain any significant damage during the wind tests, rotational ductility demands of at least 8.5 could be achieved prior to 20% loss in lateral strength.
일반주제명  
Computer science
일반주제명  
Architectural engineering
일반주제명  
Mechanical engineering
키워드  
Performance based wind design
키워드  
Reinforced concrete
키워드  
Structural engineering
키워드  
Structural walls
키워드  
Testing
기타저자  
University of California, Los Angeles Civil and Environmental Engineering 0300
기본자료저록  
Dissertations Abstracts International. 86-03B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aUnal,  Mehmet  Emre.
■24510▼aPerformance  of  Ordinary  C-Shaped  Reinforced  Concrete  Structural  Walls  Subjected  to  Wind  and  Seismic  Loading  Protocols
■260    ▼a[Sl]▼bUniversity  of  California,  Los  Angeles▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a395  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-03,  Section:  B.
■500    ▼aAdvisor:  Wallace,  John  Wright.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Los  Angeles,  2024.
■520    ▼aThe  design  of  buildings  under  wind  demands  has  traditionally  been  based  on  prescriptive  code  provisions  such  as  ASCE/SEI  7,  which  requires  the  building  components  to  stay  essentially  linear  elastic.  Recent  developments  in  wind  tunnel  testing,  structural  analysis  techniques,  and  performance-based  design  procedures  led  to  the  publication  of  the  ASCE/SEI  Prestandard  for  Performance-Based  Wind  Design  (ASCE/SEI,  2019).  The  Prestandard  allows  limited  inelastic  behavior  in  ductile  elements  of  a  building's  Main  Wind  Force  Resisting  System  (MWFRS)  under  extreme  wind  events.  However,  because  yielding  of  some  building  components  has  not  historically  been  permitted,  there  is  limited  research  available  to  understand  the  inelastic  behavior  of  structural  elements  subjected  to  wind  demands.  The  advantages  of  the  performance-based  wind  design (PBWD)  are  considered  to  be  most  impactful  for  the  design  of  tall  buildings,  where  it  is  very  common  to  use  coupled  reinforced  concrete  shear  wall  systems  as  the  MWFRS.  Although  some  research  has  been  conducted  to  understand  the  inelastic  behavior  of  reinforced  concrete  and  steel-reinforced  concrete  coupling  beams,  there  is  no  published  research  that  investigates  the  inelastic  behavior  of  reinforced  concrete  shear  walls  under  wind  demands.  To  fill  this  gap,  four  reinforced  concrete  C-shaped  structural  walls  have  been  tested  in  two  phases  under  quasi-static,  biaxial  cyclic  loading  protocols  simulating  extreme  wind  events.  Following  the  wind  loading  protocol,  a  seismic  loading  protocol  was  applied.The  design  of  the  walls  was  based  on  the  core-wall  design  of  actual  buildings  that  were  designed  and  constructed  in  high-wind  and  low-seismic  zones  in  the  United  States.  The  5  in.  thick  flanges  and  webs  of  the  walls  were  30  in.  and  75  in.  long,  respectively,  representing  approximately  one-third  scaled  C-shaped  walls  of  the  core-walls  of  these  buildings.  The  test  walls  were  detailed  as  Ordinary  walls  based  on  the  provisions  of  Chapter  11  of  ACI  318-19.  The  test  variable  for  the  Phase-I  walls  (CW-1  and  CW-2)  was  the  longitudinal  reinforcement  ratio  (ρl);  0.75%  for  CW-1  and  1.5%  for  CW-2.  Based  on  the  experimental  results  of  the  Phase-I  walls  and  feedback  from  a  Project  Advisory  Committee  (PAC),  two  more  walls  (CW-3  and  CW-4)  were  tested  during  Phase-II.  The  design  of  Phase-II  walls  was  based  on  CW-2  (ρl=1.5%),  and  the  test  variables  were  the  amount  of  confinement  provided  at  the  end  zones  of  the  flanges  (flange  edges)  and  the  amount  of  axial  load  applied  during  the  biaxial  wind  loading  protocol. The  wind  test  results  indicated  that  for  the  wall  with  the  low-to-moderate  reinforcement  ratio  (CW-1,  ρl=0.75%),  rotational  ductility  demands  of  3.0  can  be  achieved  without  any  damage  (e.g.,  concrete  spalling,  bar  buckling,  or  bar  fracture)  and  with  very  small  residual  flexural  crack  widths  (around  0.1  mm).  Since  CW-1  failed  at  a  rotational  ductility  demand  of  20  during  the  seismic  loading  protocol,  modest  inelastic  response  can  be  allowed  during  extreme  wind  events  for  the  walls  with  0.75%  or  lower  longitudinal  reinforcement  ratios.  Concrete  spalling  was  observed  at  the  flange-web  corners  and  the  flange  edges  during  the  wind  loading  protocol  for  the  walls  with  the  higher  longitudinal  reinforcement  ratio  (1.5%).  Depending  on  the  amount  of  axial  load  applied  during  the  biaxial  load  application,  concrete  crushing  and  bar  buckling  were  also  observed.  Phase-II  tests  showed  that  the  flange  edges  were  more  susceptible  to  damage  than  the  other  portions  of  the  C-shaped  walls.  With  moderate  confinement  provided  at  the  flange  edges  and  reduction  in  wall  axial  load  during  the  biaxial  loading  (when  the  flange  edges  were  under  compression),  bar  buckling  and  concrete  crushing  were  not  observed  during  the  wind  loading  protocols.  Application  of  the  seismic  loading  protocol  revealed  that,  for  the  walls  that  did  not  sustain  any  significant  damage  during  the  wind  tests,  rotational  ductility  demands  of  at  least  8.5  could  be  achieved  prior  to  20%  loss  in  lateral  strength.
■590    ▼aSchool  code:  0031.
■650  4▼aComputer  science
■650  4▼aArchitectural  engineering
■650  4▼aMechanical  engineering
■653    ▼aPerformance  based  wind  design
■653    ▼aReinforced  concrete
■653    ▼aStructural  engineering
■653    ▼aStructural  walls
■653    ▼aTesting
■690    ▼a0543
■690    ▼a0984
■690    ▼a0548
■690    ▼a0462
■71020▼aUniversity  of  California,  Los  Angeles▼bCivil  and  Environmental  Engineering  0300.
■7730  ▼tDissertations  Abstracts  International▼g86-03B.
■790    ▼a0031
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164138▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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