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Seismic protection of high-pier railway bridges using multiple vibration absorbers
Vibration absorber consists of a mass block, a spring and a viscous damper attached to the main structure. The optimum parameters of multiple vibration absorbers (MVA) for seismic applications are presented. The MVA is manufactured with uniform stiffness and damping coefficient of each absorber, so its parameters include five dimensionless ones, i.e. the average tuning ratio, average damping ratio, bandwidth factor, mass ratio and total number of the absorbers. The criterion for the MVA's parameter optimization is, for a given mass ratio and total number, to select the other three parameters that would minimize the peak amplitude of the normalized harmonic response of the main structure by numerical iteration schemes. A newly-built large high-pier railway bridge located in Neijiang-Kunming railway line is taken as an example, and the design of MVA is presented in detail. The mitigation efficiency subjected to four typical seismic records is conducted, and the results indicate that MVA, by the use of the proposed parameters, can reduce the lateral displacement response of the bridge pier significantly.
Seismic protection of high-pier railway bridges using multiple vibration absorbers
Vibration absorber consists of a mass block, a spring and a viscous damper attached to the main structure. The optimum parameters of multiple vibration absorbers (MVA) for seismic applications are presented. The MVA is manufactured with uniform stiffness and damping coefficient of each absorber, so its parameters include five dimensionless ones, i.e. the average tuning ratio, average damping ratio, bandwidth factor, mass ratio and total number of the absorbers. The criterion for the MVA's parameter optimization is, for a given mass ratio and total number, to select the other three parameters that would minimize the peak amplitude of the normalized harmonic response of the main structure by numerical iteration schemes. A newly-built large high-pier railway bridge located in Neijiang-Kunming railway line is taken as an example, and the design of MVA is presented in detail. The mitigation efficiency subjected to four typical seismic records is conducted, and the results indicate that MVA, by the use of the proposed parameters, can reduce the lateral displacement response of the bridge pier significantly.
Seismic protection of high-pier railway bridges using multiple vibration absorbers
Liu Lin (author) / Yan, Guiping (author) / Xin, Xuezhong (author)
2002
7 Seiten, 8 Quellen
Conference paper
English
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