使用板式橡胶支座连续梁桥主梁位移控制

为改善使用板式橡胶支座连续梁桥的抗震性能,通过附加黏滞阻尼器进行组合减隔震设计,采用复模态、近似实模态分析方法,研究结构地震响应及阻尼特性。结果表明:黏滞阻尼器提供的附加阻尼能有效降低梁体位移,但同时也导致桥梁具有非经典阻尼特性,主梁位移受非经典阻尼影响较小;黏滞阻尼器能明显提升结构阻尼水平,为有效控制梁体位移,应考虑黏滞阻尼器的合理布设位置,多墩布置优于单墩布置。

Beam Displacement Control of Continuous Girder Bridge Installed with Rubber Bearings

To improve the seismic performance of continuous girder bridge installed with rubber bearings, additional fluid viscous dampers are suggested in this paper, and the analysis of structural seismic response and damping property is made by complex mode and approximate real mode method. The results indicate that supplemental fluid viscous damper causes obvious beam displacement reduction and non-classical problem, but the former shows little influence caused by the latter. The position of such dampers show significant influence on structural damping level, and the installation on multi-piers superior to single-pier for beam displacement control.