서울대학교 중앙도서관
S-Space 소개
My S-Space
로그인이 필요합니다.
Login

S-Space

Publications

Detailed Information

Strengthening of RC beams with Ultra High Performance Concrete : 초고성능 콘크리트를 이용한 보 보강 실험

DC Field Value Language
dc.contributor.advisor홍성걸-
dc.contributor.author최정택-
dc.date.accessioned2017-07-14T04:02:20Z-
dc.date.available2017-07-14T04:02:20Z-
dc.date.issued2016-02-
dc.identifier.other000000132706-
dc.identifier.urihttps://hdl.handle.net/10371/124124-
dc.description학위논문 (석사)-- 서울대학교 대학원 : 건축학과, 2016. 2. 홍성걸.-
dc.description.abstractThis study investigates the structural performance of retrofitted RC-UHPC (Ultra-High Performance Concrete) composite members through measuring the effectiveness of strengthened RC beams with different regions and thickness of added UHPC. Due to its high compressive and tensile strength, thin UHPC over layers are applied to increase tensile strength in flexural strength in tension region with reinforcement and the compressive resistance in flexural compression region. For adhesion between existing concrete and UHPC, sandblasting is applied to give enough roughness.
Two series of tests were performed under four-point loads. First test program consists of 12 specimens strengthened with change in thickness, regions, fiber volume and additional reinforcement except one control beam of rectangular section. For the second program, 14 ordinary reinforced concrete T-beams were prepared to develop shear failure modes. Because strengthened beams with UHPC are supposed to enhance both positive and negative moment capacity, jacketing methods applied to this experimental program have three different schemes: UHPC U shaped-jacketing, UHPC casting on the flange, and UHPC casting on the flange and Aramid FRP U shaped-wrapping.
The experimental results show that strengthening beam with UHPC is effective to enhance strength and deflection. Especially, UHPC U shaped-jacketing method showed better performance than that of other methods by the improvement of strength, stiffness and ductility for both positive and negative moment zone. On the other hand, UHPC overlay method showed the additional treatment to improve adhesion performance between old concrete and UHPC. Strengthening effects are proportion to the strengthened thickness without shear failure. For additional reinforcement with UHPC, the increase in strength and ductility were shown. AFRP with UHPC and additional steel fiber in UHPC showed a little increase in strength. Wire mesh showed no contribution to performance.
Based on the test result of this study, theoretical analysis determined by a cross-sectional analytical model based on plane section showed 15% error range about rectangular sectional beams, 21% error range for T-shaped sectional beams.
In case of T-shaped RC beams showing debonding failure, average interfacial shear stress were calculated and compared with current design code and slant-shear test results. It showed that for positive moment, the highest shear stress occurred at overlaid UHPC panel		-
dc.description.tableofcontentsChapter 1. Introduction 1
1.1 General 1
1.2 Ultra-High Performance concrete 3
1.3 Scope and Objectives 5

Chapter 2. Literature Review 6
2.1 JSCE guideline-Recommendations for Design and Construction of HPFRCC, 2008 6
2.1.1 Calculation of stress and strain 6
2.1.2 Design shear capacity 7
2.2 Strengthening beam with UHPC 8
2.2.1 Katrin Habel(2004) 8
2.2.2 Taylayeh Noshiravani(2012) 8
2.3 Comparison UHPC strengthening method with others 9
2.4 Interfacial bond between UHPC and concrete 15

Chapter 3. Strengthening RC beams without stirrups with Ultra High Performance Concrete 17
3.1 Experimental program 17
3.1.1 Introduction 17
3.1.2 Test specimens and Variables 17
3.1.3 Surface preparation 20
3.1.4 Material properties 22
3.1.5 Test setup and procedure 24
3.2 Test results 26
3.2.1 Reference beam 26
3.2.2 UHPC Side strengthened beam 26
3.2.3 UHPC Base strengthened beam 28
3.2.4 UHPC U-shaped jacketing 30
3.2.5 UHPC Base strengthened beam with different fiber volume 32
3.2.6 UHPC U-shaped jacketing with additional reinforcement 34
3.3 Collapse mechanisms 37
3.4 Strengthening Effect 38
3.5 Theoretical analysis 42
3.5.1 Flexural strength 42
3.5.2 Shear strength 48
3.5.3 Validation 49
3.6 Discussion 51

Chapter 4. Strengthening T-shaped RC beams with Ultra High Performance Concrete 52
4.1 Experimental program 52
4.1.1 Summary 52
4.1.2 Introduction 52
4.1.3 Test specimens and Variables 53
4.1.4 Material properties 55
4.1.5 Specimen preparation 56
4.1.6 Test setup and procedure 59
4.2 Test results 60
4.2.1 Reference beam 60
4.2.2 UHPC U-shaped jacketing 60
4.2.3 UHPC Overlay 63
4.2.4 Aramid FRP U wrapping with/without UHPC Overlay 66
4.2.5 Flexural failure vs. shear failure 71
4.3 Strengthening Effect 74
4.4 Theoretical analysis 77
4.4.1 Flexural strength 77
4.4.2 Shear strength 84
4.4.3 Validation 85
4.4.4 Shear stress 88
4.5 Discussion 99

Chapter 5. Conclusions 100

References 102


초 록 104		-
dc.formatapplication/pdf-
dc.format.extent9279076 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectUHPC-
dc.subjectretrofit-
dc.subjectstrengthening-
dc.subjectcomposite beams-
dc.subject.ddc690-
dc.titleStrengthening of RC beams with Ultra High Performance Concrete-
dc.title.alternative초고성능 콘크리트를 이용한 보 보강 실험-
dc.typeThesis-
dc.description.degreeMaster-
dc.citation.pagesxv, 105-
dc.contributor.affiliation공과대학 건축학과-
dc.date.awarded2016-02-
Appears in Collections:
Files in This Item:

Altmetrics

Item View & Download Count

Show Simple Item Record
Find it @ SNU

  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Share

qrcode
SNS Share