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Seismic Mitigation and Isolation Design of Main Bridge of Sanmenxia Huanghe River Rail-cum-Road Bridge
Author(s): 
Pages: 91-95
Year: Issue:  2
Journal: Bridge Construction

Keyword:  rail-cum-road bridgecomposite girdersteel truss girderhyperbolic spherical seismic mitigation and isolation bearingseismic mitigation and isolation designductility designseismic design;
Abstract: The main bridge of Sanmenxia Huanghe River Rail-cum-Road Bridge is a continuous composite steel truss girder structure with span arrangement(84+9×108+84)m.The dead load of the main girder of the bridge is 1 030kN/m and the pier height is 60~72m.The horizontal ground motion peak acceleration in the bridge site area is 0.18g and the site type is of Class III.To attain the goal of the seismic fortification,the hyperbolic spherical seismic mitigation and isolation bearings were arranged at the tops of the main piers.The spacing distance from spherical center to spherical center of the bearings is 7mand the friction coefficient is 0.03.In the design,the software MIDAS Civil was used to set up the finite element model for the whole bridge, to carry out the analysis of the seismic dynamic and according to the analysis,the checking calculation of the piers and foundations was made.The results of the checking calculation show that under the designed seismic action,the main structure of the bridge works in the elastic range while under the rare seismic action,the pier footings may come to the plastic yield stage and the pier columns should be designed as the ductile components.Based on the analysis of the seismic dynamic and the checking calculation of the piers and foundations,it is determined that the horizontal bearing capacity of the shear studs of the hyperbolic spherical bearings should be designed in terms of 1.4times of the frequent seismic response values.
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