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《Spatial Structures》 2011-04
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Application research on lead rubber bearings in a three-pylon cable-stayed bridge without back stay

BU Zhan-yu1,CHEN Jian2 (1.Faculty of Architecture,Civil Engineering and Environment,Ningbo University,Ningbo 315211,China; 2.Architectural Design & Research Institute of Ningbo University Co.,LTD,Ningbo 315211,China)  
The span makeup of a three-pylon cable-stayed bridge without back stay is 30 meters plus 60 meters plus 70 meters plus 80 meters plus 40meters,which adds up to 280meters in total.The three middle spans are arch pylon cable-stayed bridge.The structural form is pylon-girder fixed and girder-pier separated.The whole bridge is a five span continuous beam system.Partial dead load and live load are carried by stay cables.So the bridge belongs to partial cable-stayed bridge.The constraints include two types,namely pot rubber bearing support and lead rubber bearing support.The calculation results by response spectra analysis show that the bridge primarily stays in elastic condition under the seismic load of E1 level,while most of piers of main bridge come into yielding stage during E2 level earthquake.If lead rubber bearings are used in piers of main bridge,all piers stay in elastic condition under both E1 and E2 level earthquake through elongating structural vibration period,internal seismic force is reduced and the relative displacement between superstructure and the pier is controlled,which makes the design fulfilling the requirement of specifications.Finally the time-history analysis was carried out with nonlinear bearing supports and the results were verified valid through comparing with response spectra calculation results.
【Fund】: 浙江省科技厅公益技术研究工业项目(2011C21078);; 宁波市科技局社会发展科研项目(2011C50017);; 宁波大学学科项目
【CateGory Index】: U443.36
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