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Optimization Design and Economy Analysis of Seismic Support Systems for Urban Viaducts
Author(s): 
Pages: 78-84
Year: Issue:  2
Journal: Bridge Construction

Keyword:  viaductseismic resistant systemductility seismic resistanceseismic mitigation and isolation techniqueeconomyfinite element method;
Abstract: To optimize the seismic support systems for urban viaducts and to promote proper application of the seismic mitigation and isolation techniques,the mainline viaduct on the Jiamin Elevated Route in Shanghai was taken as the research object.In view of the viaduct having the serial standard spans,different pier height and pier sectional dimensions,the ductility seismic resistant system and the seismic mitigation and isolation system were respectively selected and applied and the laws of seismic responses of the two kinds of the systems were analyzed.By properly matching the seismic resistant requirements and the structural capacity,the design parameters of the principal structural components of the foundations of the viaduct were optimally analyzed and further to the analysis,the economy of the two systems was analyzed.The results of the analysis indicate that the ductility seismic resistant system is applicable to area of the viaduct with tall piers.The proper selection of the sectional dimensions of the pier columns can significantly optimize the structural system and effectively reduce the total structural cost.The seismic mitigation and isolation system is more applicable to the area of the viaduct with short piers.Though the cost of the seismic mitigation and isolation system is far more expensive than that of the common pot bearings,the cost can be effectively compensated by the cost saving of the foundations after the system is applied and as a consequence,better economy can be achieved in general.
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