| Author | Sedarage, Bandu Gamini |
| Call Number | AIT Thesis no.ST-90-14 |
| 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 | Influence of the nonlinear tension-softening curve on the fracture behavior of finite size
concrete specimens is discussed by using Boundary Element Method (BEM). A boundary
element method program is developed for Dugdale-Barenblatt -type model of bridging zone
with nonlinear tension-softening curve to investigate the effect of shape of tension-softening
curve on the fracture behavior. Boundary integral equations (BIE) equivalent to original crack
problems are presented with a consideration on the treatment of crack boundaries. Wedge
loaded specimens and three point bending specimens with different sizes are analyzed with
linear and nonlinear tension-softening curves. The results for wedge loaded specimens obtained
by the present model are compared with those by an existing model and the experimental
results. The maximum loads predicted by the present model for three point bending specimens,
are also compared with the experimental results. Along bridging zone which is modelled as a
part of crack with stress transmitted by aggregate, the transmitted stress and crack opening
displacement (normal stress and normal displacement gap) satisfy a given relationship which
is called tension-softening curve. The stress intensity factor at the tip of the bridging zone is
assumed to be zero which assures that stress is bounded. With these conditions, boundary
integral equations are solved numerically where boundary quantities are approximated by
piecewise constant functions. For given specimen geometry, loading condition and bridging
zone length, an associated value of load is obtained, together with distributions of transmitted
stress and crack opening displacement. In general, the transmitted stress is a nonlinear function
of the crack opening displacement. To satisfy this nonlinear relationship, Boundary Element
Method (BEM) program is modified with Newton-Rapson's method. |
| 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) | Karasudhi, Pisidhi ;Worsak Kanok-Nukulchai; |
| Scholarship Donor(s) | Norwegian Government (NORAD) ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1990 |