| Author | Chau, Kwok-ping |
| Call Number | AIT Thesis no. 798 |
| Subject(s) | Earthquakes and building
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology,
Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | The response of a tall multi-flue stack to earthquake was investigated in this study . Each flue consists of a number of equal lengths supported on platforms. The platforms are connected to rubber bearings
which are in turn supported by the outer shell. The outer shell mass was idealized into the same number of elements as the flue lengths. The system was therefore represented by a number of masses with associated spring and damping elements. The equation of motion was derived by means of Lagrange equation incorporating the rotational effects of all
masses and the strain energy of the inner flues . . The stiffness of the outer shell and the flues were computed on the assumption that they
behave as slender beams. The damping matrix in the system was assumed to be proportional to the stiffness matrix of the system. The equations of motion were solved by the method of classical normal modes . The stack chosen for illustrating the analysis is 242 m high and made of reinforced concrete. The outer shell with a 26 m diameter encloses three elliptical reinforced concrete flues. For the response of this type of structure it depends much upon the damping, more investigations on it is recommended . Comparing the responses of the cases of
rubber bearing and rigid bearing, the rubber bearings reduce the fundamental frequency, maximum shear force and bending moment in the outer
shell by approximately fifty percent. |
| Year | 1975 |
| Type | Thesis |
| School | Student Research Before 1980 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Karasudhi, Pisidhi |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1975 |