克孜河预应力渡槽工程顺槽向抗震减震技术方案研究

Anti-seismic Damping Technology of Prestressed Aqueduct Project on Kirzi River

大型预应力渡槽结构的抗震减震支座是有效减轻地震灾害影响的重要措施,是保证渡槽结构和运营安全的关键设计之一,且克孜河跨河渡槽工程的设计地震基本烈度为Ⅷ度,因此很有必要开展渡槽抗震减震技术方案研究。通过对普通板式橡胶支座、四氟板式橡胶支座、铅芯隔震橡胶支座三种方案分析比较,对高排架预应力混凝土渡槽建立了力学简化模型,分析了三种抗震减震支座的渡槽上部结构自振周期、排架墩地震响应分析、上部结构地震位移响应和上部结构支座剪切变形响应,并对抗震减震效果进行了评价,提出了采用铅芯隔震橡胶支座作为克孜河预应力渡槽工程的支座。经校核结果表明,抗震减震效果较好,达到了设计预期目标。

The seismic damper bearing of large prestressed aqueduct structure is an important measure to effectively mitigate the impacts of earthquake disasters,and one of the key design to ensure the safety of aqueduct structure and operation.The basic seismic intensity of the design of aqueduct project of Kirzi River is Ⅷ degree,so it is necessary to carry out research on seismic shock absorption technology of aqueduct.Through the analysis and comparison of three kinds of schemes Laminated Rubber Bearing,PTFE Rubber Bearing and Lead Rubber Bearing,a simplified mechanical model is established for the high-row prestressed concrete aqueduct,and three kinds of seismic damping branches are analyzed.The self-vibration period of upper structure,seismic response analysis of the pier,seismic displacement response of upper structure and shear deformation response of upper structure support,and seismic shock absorption effect were evaluated.And Lead Rubber Bearing was suggested for prestressed aqueduct project of Kirzi River,and seismic shock absorption effect has reached the design target through calibration analysis.