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Short fibers reinforced concrete quasi-plastic fracture analysis

Kısa elyaf takviyeli beton yarım-plastik kırılma analizi

  1. Tez No: 780932
  2. Yazar: AMJAD KHABAZ
  3. Danışmanlar: PROF. DR. ANDREJS KRASNİKOVS
  4. Tez Türü: Doktora
  5. Konular: İnşaat Mühendisliği, Civil Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2009
  8. Dil: İngilizce
  9. Üniversite: Riga Technical University
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: İnşaat Mühendisliği Ana Bilim Dalı
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 281

Özet

Fiber reinforced concrete (FRC) has undergone rapid development during the last years. This composite material has been successfully used in various applications in civil engineering. Because of the affordable price and the simple casting procedure, enhanced production methods should be seriously considered regarding the mechanical and physical properties of different fiber types and concrete matrix variants. Short fiber addition to concrete matrix changes its mechanical behaviour leading to a quasi-plastic post-cracking behaviour, increased durability, impact resistance, fracture toughness etc. In the present research, the mechanical and technological properties of short, straight fiber reinforced concrete have been comprehensively investigated. The PhD thesis consists of seven chapters. The first chapter is devoted to a literature review, which introduces initial evaluation of FRC benefits in construction and its application possibilities by providing the latest research results in this scientific area, as well as the definition of the main problems of fiber concrete mechanics, which it is necessary to investigate in the PhD thesis. Chapter 2 describes the mixing and casting problems connected with fresh fiber concrete and shows suitable solutions for its mixing (wet way) and casting (vibration control); The third chapter presents the results of FEM numerical modeling for the mechanical process of a single fiber (or a fiber bundle) pulling out of the concrete matrix during a crack (bridged by fibers) opening in FRC. Comparing the results of the performed pull-out experiments, the real value of friction coefficient at the interface between concrete and the straight fiber was successfully found out. The fourth chapter is devoted to comparing the results of the executed experimental program for beams post-cracking behavior under bending using theoretical methods where the bending stress and the cracked beam load-bearing capacity were evaluated for different fiber types and concentrations. The failure prediction results made on the basis of structural modeling are described in Chapter 5. The recommendations and standards are described in Chapter 6, where new suggestions have been made for more precise safety factors during our experimental data. In the end, the final conclusions of this research are summarized in Chapter 7 in which it is also suggested that a single European standard for fiber reinforced concrete should be introduced.

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