长联大跨连续钢桁梁抗震型式研究

以黄大线黄河特大桥主桥(120+4×180+120)m下承式连续钢桁梁结构为实际工程背景,研究非线性黏滞阻尼器对该桥抗震性能的影响。利用Midas/civil建立空间有限元模型,选用适合桥址处场地等级及地震特性的3条地震波,采用非线性时程分析方法,检算在活动墩与主梁之间设置液体黏滞阻尼器装置和无阻尼器的不同抗震效果。结论表明在活动墩与主梁之间设置液体黏滞阻尼器装置,有效协调各活动墩在动力作用下的参与工作,降低固定主墩地震力,有效提高主桥的地震设防标准。

Research on Seismic Pattern of Long Span Continuous Steel Truss

With reference to the practical engineering of Yellow River main bridge( 120 + 4 × 180 + 180)m on Huang ~ Da Railway of concrete-filled continuous steel truss beam structure,this paper studies the influence of the nonlinear viscous damper on anti-seismic performance. A space finite element model is built with Midas / civil and three seismic waves suitable for site grade and seismic characteristics of bridge site are selected to study the anti-seismic effect of the fluid viscous damper device installed or not installed between the non-fixed pier and the main beam with nonlinear time history analysis. By setting up fluid viscous damper between the non-fixed pier and the main girder,the non-fixed pier is effectively coordinated under the dynamic action,the seismic force of the fixed pier is reduced and the seismic fortification standard of the main bridge iseffectively improved.