Shear behavior of reinforced beams of high-strength concrete without web reinforcement | |
| Author | Das, Animesh |
| Call Number | AIT Thesis no.ST-97-17 |
| Subject(s) | Concrete beams Strength of materials |
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-97-17 |
| Abstract | High strength concrete is one of the most recent developments in concrete technology. This study reports the shear behavior of longitudinally reinforced beams of high strength concrete. The experimental investigation consists of five beams, subjected to two point loading. Fracture properties (fracture energy and tension-softening curve) of high strength concrete are also investigated by testing the beams using RILEM method. The test results are incorporated into a finite element model to predict the shear property of the tested beams. The experimental results show that the shear resistance of beams is heavily influenced by the tensile strength and fracture energy in the high strength concrete range. With increasing concrete compressive strength, the tensile strength increases under-proportionally. The variation of shear capacity tends to becoming nearly constant regardless of increasing concrete strength. The tests of beams indicate that in the existing codes the contribution of the concrete strength tends to be overestimated. Increasing tensile and I or compressive strength, however, does not always mean the increase of fracture energy, clearly indicating that the brittleness increases with strength which does not increase the shear capacity of high strength concrete. Shear failure has been analyzed numerically using fracture model. The analytical model produces good results which can safely apply for this type of material. Furthermore, the test results indicate a strong dependence of strength on brittleness for normal strength concrete than for high strength concrete. The decrease in shear strength of concrete with increase in brittleness is of significant importance to high strength concrete. Future design rules should take into account the loss of ductility for higher concrete strengths, effect of reinforcement and size effects. |
| Year | 1997 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-97-17 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Junichiro Niwa |
| Examination Committee(s) | Pichai Nimityongskul;Somnuk Tangtermsirikul;Baba, Keizo |
| Scholarship Donor(s) | Government of Japan. |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1997 |