CAJ | 학술논문

为了给桥梁抗震设计提供参考，以减轻桥梁结构在地震中遭受的损伤，介绍一种弹塑性钢减隔震支座（NDQZ）的结构特点及其减隔震原理，并以（83＋140＋83） m双塔双索面预应力混凝土斜拉桥为实例进行减隔震分析。采用有限元分析软件SAP2000建立全桥有限元模型，在E2地震状态下分别进行非减隔震支座桥梁和NDQZ支座桥梁地震动力时程分析。结果表明：NDQZ支座可实现全桥协同抗震，减隔震效果良好；采用NDQZ支座后，桥梁前3阶自振周期平均延长133％，在顺桥向和横桥向墩底弯矩分别减小了40％和83％，墩底剪力分别减小了39％和70％；承台底弯矩分别减小了39％和74％，承台底剪力分别减小了34％和60％；弯矩和剪力分布均匀。
위료급교량항진설계제공삼고，이감경교량결구재지진중조수적손상，개소일충탄소성강감격진지좌（NDQZ）적결구특점급기감격진원리，병이（83＋140＋83） m쌍탑쌍색면예응력혼응토사랍교위실례진행감격진분석。채용유한원분석연건SAP2000건립전교유한원모형，재E2지진상태하분별진행비감격진지좌교량화NDQZ지좌교량지진동력시정분석。결과표명：NDQZ지좌가실현전교협동항진，감격진효과량호；채용NDQZ지좌후，교량전3계자진주기평균연장133％，재순교향화횡교향돈저만구분별감소료40％화83％，돈저전력분별감소료39％화70％；승태저만구분별감소료39％화74％，승태저전력분별감소료34％화60％；만구화전력분포균균。
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 .