| title: | The effect of the shear stiffness on the bending of a passenger ship |
|---|---|
| reg no: | ETF6740 |
| project type: | Estonian Science Foundation research grant |
| subject: |
2.3. Mechanics |
| status: | accepted |
| institution: | TTU Faculty of Civil Engineering |
| head of project: | Jaan Metsaveer |
| duration: | 01.01.2006 - 31.12.2009 |
| description: | A modern passenger ship has a number of large window openings, which weaken the ship structure. The passenger ship also has a superstructure with low shear stiffness and its influence to global bending is difficult to predict. Therefore, the strength assessment of a passenger ship is complicated and time-consuming procedure and the simple beam theory is not suitable. A simple and fast design tool could be very useful for ship designers. In this project the main emphasis will be on the further development of the coupled beams method for the fast strength assessment of a passenger ship. The main idea of the coupled beams method is based on the assumption that the cross-section of the ship can be divided into several beams placed over each other or side-by-side. Each beam is coupled with an adjacent beam by lateral and tangential coupling elements. The geometry and the material parameters can vary in the direction of ship length. The stiffness of the coupling elements will be analytically prescribed by the structure, which connects adjacent decks or deck parts. The beam equations together with the equations for the couplings form the matrix system, which can be solved for displacements. Based on the displacements the stresses can be estimated. The method will be validated with full-scale test results and with the Finite Element method. The coupled beams method will be extended for ultimate strength estimation by adding a possibility that the stiffened structural elements can have plastic and lose stability. Again the problem can be formulated as a system of equations, which can be solved iteratively. The results for the ultimate strength obtained with the coupled beams method will be compared with the Finite Element results. |
| project group | ||||
|---|---|---|---|---|
| no | name | institution | position | |
| 1. | Jaan Metsaveer | Tallinna Tehnikaülikooli Ehitusteaduskond | ||
| 2. | Hendrik Naar | |||
| 3. | Kristjan Tabri | |||