| Author | Tada, Masaru |
| Call Number | AIT Thesis no.ST-90-20 |
| Subject(s) | Concrete--Cracking
|
| Note |
A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | An accurate in-plane displacement measurement system was established
based on the laser speckle method in order to measure displacement field
due to crack propagation on the surface of a wedge - load- type specimen of
concrete or mortar.
Crack growth behavior on the specimen surface was observed utilizing
the established measurement system. Fracture process zone in the
specimen was modelled with the Dugdale-Barenblatt- type model employing
tension - softening relation as material property under tensile fracture.
Analysis based on the boundary element method was then performed on this
analytical model . The results obtained by the observation and the
analysis were compared. The predicted maximum load value was in a
relatively good accord with the obtained maximum load value in the
fracture test for crack observation . The predicted distribution of crack
opening displacement (crack profile) agreed with the observed crack
profile when load was relatively small. However, with increasing load
the observed crack length became larger and crack opening was detected
ahead of the predicted crack tip . Accordingly shape of the observed
crack profile differs from the prediction by the present model. Possible
causes which account for this discrepancy were discussed.
Measurement of tension-softening relation was attempted based on the
J-integral method on both concrete and mortar . The obtained tension-softening curve was far from reported results
obtained using the same method as well as a
Problems in the method were pointed out and
discussed.
in previous researches
direct tension test.
possible causes were |
| Year | 1990 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Horii, Hideyuki |
| Examination Committee(s) | Pama, Ricardo P. ;Ueda, Tamon
|
| Scholarship Donor(s) | Th e Royal Thai Government |
| Degree |
A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |