Control mode selection for modal control of long-span arch bridge

2009年第3卷第4期

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《结构与土木工程前沿（英文）》 >> 2009年第3卷第4期 doi: 10.1007/s11709-009-0052-z

Control mode selection for modal control of long-span arch bridge

Faculty of Civil Engineering, Chongqing University, Chongqing 400030, China;

发布日期： 2009-12-05

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摘要

For seismic control of arch bridge, a model reduction of long-span arch bridge was implemented based on modal analysis. As for the critical mode selection, an approach based on the maximum modal displacement was presented. This approach takes into consideration the effect of external seismic excitation and is more reasonable than only considering dynamic bridge characteristics based on a modal contribution ratio. The time domain and frequency domain analysis method were used to verify the simplified model of the Nimu arch bridge in Tibet as an example. The numerical results show that the method of maximal modal displacement better analyze long-span arch bridge when multisupport seismic excitation must be considered. The reduced-order system also is more in line with the performance of the original model.

关键词

selection ; reduced-order ; excitation ; long-span ; simplified