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Application of Elasto-Plastic Steel Seismic Isolators to Bridge Anti-Seismic Design
Pages: 44-48
Year: Issue:  5
Journal: World Bridges

Keyword:  bridgeanti-seismic designseismic isolatordynamic time-history analysisben-ding momentshearing force;
Abstract: To provide reference for bridge anti‐seismic design and reduce the damage that bridge suffers in earthquakes ,the structural features and principles of vibration mitigation and iso‐lation of a kind of elasto‐plastic steel seismic isolators (NDQZ)is introduced .A two‐pylon pres‐tressed concrete cable‐stayed bridge with span arrangement of (83+140+83) m and with double cable planes is cited as an example to conduct vibration mitigation and isolation analysis .T he finite element software SAP2000 was used to establish the finite element model of the whole bridge ,to carry out time‐history analysis of the bridge with bearings incapable of vibration mitigation and iso‐lation effect and the bridge with NDQZ under the E2 earthquake condition respectively .The re‐sults of the analysis indicate that the NDQZ bearings can realize the effect of the w hole‐bridge col‐laborative vibration resistance ,displaying sound vibration mitigation and isolation effect .When the NDQZ bearings are used ,the first three orders of bridge natural vibration period averagely ex‐tends 133% .The bending moments in the base of the piers along the bridge length and width re‐duce 40% and 83% respectively ,and the shearing force reduce 39% and 70% ,respectively .The bending moments in the base of the pile caps reduce 39% and 74% ,respectively and the shearing force reduce 34% and 60% ,respectively .The bending moment and shearing force are uniformly distributed .
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