|
|||||
|
|
Optimum geometry of tuned liquid column-gas damper for control of offshore jacket platform vibrations under seismic excitation |
|
| Authors: | Seyed Amin Mousavi Seyed Mehdi Zahrai Khosrow Bargi |
| Institution: | 1. R & D Department, Sabok Sazane Sarie Engineering Company, Tehran, Iran 3. No. 4, D.d end Nahid, Hashemiyan St., 3th Neyestan, Pasdaran, Tehran, Iran 2. Center of Excellence for Engineering and Management of Civil Infrastructures, School of Civil Engineering, Pardis College of Engineering, The University of Tehran, Tehran, Iran |
| Abstract: | In this study, the effectiveness of a tuned liquid column-gas damper, TLCGD, on the suppression of seismicinduced vibrations of steel jacket platforms is evaluated. TLCGD is an interesting choice in the case of jacket platforms because it is possible to use the structural elements as the horizontal column of the TLCGD. The objective here is to find the optimum geometric parameters, namely orientation and configuration of vertical columns, length ratio, and area ratio of the TLCGD, considering nonlinear damping of the TLCGD and water-structure interaction between the jacket platform and sea water. The effects of different characteristics of ground motion such as PGA and frequency content on the optimum geometry are also investigated and it is observed that these features have some influence on the optimum area ratio. Finally it is observed that pulse arrangement of ground acceleration is one of the most important parameters affecting the efficiency of a TLCGD. In other words, it is found that the TLCGD’s capability to reduce the RMS responses depends only on the frequency content of the ground acceleration, but its capability to reduce the maximum responses depends on both the frequency content and the pulse arrangement of the ground acceleration. |
| Keywords: | passive control tuned liquid column damper TLCGD offshore platform optimum geometry |
| 本文献已被 CNKI 维普 SpringerLink 等数据库收录！ | |