New method to determine the tension softening diagram of concrete | |
| Author | Taweechai Sumranwanich |
| Call Number | AIT Thesis no. ST-97-5 |
| Subject(s) | Concrete--Cracking Fracture mechanics |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-97-5 |
| Abstract | Tension softening diagram is one of the most important fracture properties of concrete. Various methods have been already proposed to determine this softening diagram such as new I-integral based method, modified I-integral based method, and so on. However, a widely accepted common method has not been established so far. Hence, the establishment of more suitable and general method to determine the tension softening diagram is required. Once the tension softening diagram has been formulated, it can be incorporated into the numerical analysis such as fictitious crack model. Based on both the experimental observation and the analytical examination, the new method to determine the tension softening diagram of concrete is proposed in this study. The characteristics of the new method is described, and its effectiveness is evaluated by comparing with the one-fourth bilinear model. Both the fracture energy and the tension softening diagram of many types of concrete are investigated at different ages. The new method to determine tension softening diagram of concrete in this study is a modified method of the modified I-integral based method. There are two modifications in this method. They are the subtraction of elastic energy and the crack length propagation. The tension softening diagram obtained from the new method is better than those obtained from the new I-integral based method and the modified I-integral based method. It gives the long tail part which is corresponding to the critical crack width at the actual failure of concrete, and is very close to the one-fomih bilinear model. Moreover, it is observed that the crack length propagation is more influential than the subtraction of elastic energy to improve the tension softening diagram. |
| Year | 1997 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-97-5 |
| 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) | Worsak Kanok-Nukulchai;Somnuk Tangtermsirikul;Chen, Jian-Shiuh |
| Scholarship Donor(s) | Asian Institute of Technology Partial Scholarship |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1997 |