| Author | Rahim, Sjahril A. |
| Call Number | AIT Thesis no.ST-83-13 |
| Subject(s) | Arch dams
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | The optimum shape of an arch dam for static loads (dead load and hydrostatic pressure) taking into account geometrical and stress constrains is studied. The objective function is the volume of concrete for the dam.
Two nonlinear optimization techniques are employed in order to obtain the optimum shape. Firstly, in the feasible domain, the steepest descent method is used until the stress constraints are active. Secondly, once the constraints are active, then the feasible-usable direction method is used in order to improve the objective function without violating the stress and geometrical constraints. The shape of the arch dam is represented by three factors. the shape of crown cantilever in the extrados side, the thickness variation of the dam along the crown cantilever and the radius of cylindrical reference surface. Three variation patterns of the thickness of the dam are studied, i.e., a linear variation plus two different quadratic variations. The arch dam is assumed to be symmetric and fixed at the base and abutments. The stresses in the arch dam are calculated with the ADAP computer program.
The results by these methods for an existing dam (Tangga dam, Indonesia) indicate that optimization methods are desirable to obtain the optimum or most economical shape. The results show that it is possible to reduce the volume of concrete in the order of 20% under the given loading condition, with the quadratic thickness variation giving the minimum volume. |
| Year | 1983 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Wireland, Martin
|
| Examination Committee(s) | Karasudhi, Pisidhi ; Usami, Tsutomu
|
| Scholarship Donor(s) | Government of Australia |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1983 |