Optimal Design Procedures for Isolation Systems and Bidirectional Experiment on Friction Pendulum Isolation System
Date Issued
2015
Date
2015
Author(s)
Wang, Sheng-Hsuan
Abstract
In the conventional isolation design procedures, the energy dissipation parameters, like equivalent damping ratio and friction coefficient, are not determined by some certain criteria but engineers’ pratical experience. Therefore, we attempted to integrate the optimal formula of dissipation parameters into the conventional design procedures called optimal design procedures, and chose a real case to do the time history analysis and then discussed the feasibility of optimal design procedures. Three earthquake types were utilized as input, one was the design earthquake, another was a non-design earthquake with PGA which was 1.5 times the design earthquake, the other was a near-fault earthquake. According to the analysis results, if the case utilized elastomeric isolators designed by optimal damping ratio design procedures, the isolation system could play a good result about isolation effect and displacement regardless of the types of input. If the case utilized friction pendulum system designed by optimal friction coefficient design procedures, the isolation displacement will be greater than the design displacement. For this reason, we tried to modify the logic of optimal friction coefficient design procedures, in order to obtain the required friction coefficient which would satisfy the demand of the non-design earthquake. Because the difference between the optimal design procedures and the conventional one is insignificant, engineers will feel comfortable to adopt the optimal design procedures. The optimal dissipation parameters formula will be the criteria in deciding the damping ratio and friction coefficient. In the previous researches about simulating bidirectional response of friction pendulum system, the isolation model was directly simplified without any verification. Therefore, we tried to verify the simplication through the mathematical derivation and experimental data, and then utilized the simplified model to simulate the unidirectional and bidirectional response. The comparison between experimental data and simulation results was conducted. On the basis of the comparison results, we firmly believe that the simplified isolation model is reliable. Finally, The comparison between unidirectional and bidirectional simulation was also executed, and then the advantage of bidirectional simulation is obvious.
Subjects
elastomeric isolation system
friction pendulum system
optimal design procedures
dynamic stability
bidirectional isolation test
bidirection simulation
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-104-R01521234-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):5062302c48b5633118297064b1594064