This thesis emphasizes the critical importance of crack control in designing and constructing reinforced concrete (RC) structures. Cracks in such structures can significantly reduce strength and durability, pose safety risks, and lead to high repair costs. Existing codes and standards offer varying approaches, resulting in inconsistent results in designing for serviceability limit state (SLS). The evolution of modern reinforced concrete, incorporating additives like superplasticizers and silica fume, requires an update to crack control models based on outdated conceptions. The thesis aims to compare crack width calculations, understand bond stress in contemporary concrete models, and enhance crack control models. The study covers crack development, mathematical aspects of crack design, laboratory testing, and analysis of RC specimens. The findings aim to offer valuable recommendations and improve crack control measures, contributing to a more robust database and aiding the development of effective global model codes and standards for crack control in RC structures.:1. Introduction
2. General knowledge of cracks in RC structures
2.1. Cause of crack formation
2.1.1. Crack during the hardening process
2.1.1.1. Plastic shrinkage cracks
2.1.1.2. Plastic settlement cracks
2.1.2. Crack of hardened concrete
2.1.2.1. Drying shrinkage cracks
2.1.2.2. Thermal cracks
2.1.2.3. Crack due to chemical reaction
2.1.3. Crack due to external loads
2.2. Crack development in an axially loaded member
3. Crack width calculations
3.1. Design formula according to EN:1992
3.1.1. Calculating crack width
3.1.2. Calculating minimum reinforcement
3.1.3. Detailing of reinforcement
3.2. Design formula according to fib Model Code
3.2.1. Crack width calculation per fib Model Code 1990
3.2.2. Crack width calculation per fib Model Code 2010
3.3. Design formula in other codes and standards
3.3.1. Crack width calculation in American standard (ACI)
3.3.2. Crack width calculation in British standard (BS)
3.3.3. Crack width calculation in Vietnamese standard (TCVN)
3.3.4. Summary and example of crack width calculations
a. Crack control per EN 1992-1-1
b. Crack control per Model Code 1990
c. Crack control per Model Code 2010
d. Crack control per ACI
e. Crack control per BS
f. Crack control per TCVN
4. Pull-out experiments
4.1. Experimental basis
4.2. Experiment setup
4.2.1. Test machine
4.2.2. Test cubes
5. Results and Discussion
5.1. Failure modes and bond-slip curves
5.2. The bond-slip functions
6. Conclusion
7. References
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:88764 |
| Date | 22 December 2023 |
| Creators | Do, Nguyen Khoi |
| Contributors | Holschemacher, Klaus, Käseberg, Stefan, Hochschule für Technik, Wirtschaft und Kultur |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/acceptedVersion, doc-type:masterThesis, info:eu-repo/semantics/masterThesis, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
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