| Author | Le Quang Khai |
| Call Number | AIT Thesis no. ST-95-12 |
| Subject(s) | Cable structures
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-95-12 |
| Abstract | Dynamic characteristics of tower-conductor structures are studied systematically by analytical approach. The study starts from the analyses of three dimensional single span cable system with rigid and flexible supports. Analyses of multi-span cable system with intermediate roller supports are carried out also by direct equilibrium method. Applicable range of the developed theory is investigated for the case of transmission line structure. Local modes/global modes approach is adopted to obtain a set of linear semi-analytical equations of motions for tower-conductor system. Local modes are modes of purely dynamic conductor motions, i.e., dynamic motions of the conductor between rigid supports. Global modes are modes of tower-conductor motions including the quasi-static motions of the conductor. The quasi-static motions are the displacements of the conductor that moves as an elastic tendon due to the support movements and these satisfies the time-dependent boundaries statically. By these semi-analytical governing equations, dynamic characteristics of tower-conductor systems can be investigated with the lowest possible degree of freedom and with considerable accuracy when comparing with FEM approach. This newly derived model can give better insight to understand complex interaction behaviors of tower-conductor system. Cable-leading modes, tower-leading modes, and coupled mode between conductor and tower are shown clearly by the eigenvectors obtained from the analysis. Freely undamped vibrations for many tower-conductor systems are studied using this new model. The results obtained including modal frequencies and mode shapes are compared with those obtained from FEM analyses. They are agreed well with each other. |
| Year | 1995 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-95-12 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pennung Warnitchai |
| Examination Committee(s) | Worsak Kanok-Nukulchai;Wijeyewickrema, Anil C. |
| Scholarship Donor(s) | DAAD;German Government |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1995 |