大跨连续梁黏滞阻尼器的失效影响分析

Analysis on Failure Effects of Viscous Dampers for Long-span Continuous Beams

摘要:

近年来，黏滞阻尼器广泛应用于高烈度地区大跨桥梁的减震设计中，但其平均寿命远小于桥梁结构的设计使用年限，在桥梁全寿命周期内，来不及检测或未被发现的失效的黏滞阻尼器可能仍在使用，给桥梁抗震带来隐患。结合某新建高速铁路大跨连续梁，对黏滞阻尼器失效的多种工况进行了有限元分析，得出了不同工况下的墩顶剪力及墩梁相对位移。分析认为：全部或单个阻尼器变为类似刚体或全部阻尼器完全失去阻尼作用，将对连续梁结构安全造成严重影响，应在阻尼器的设计、制造、安装和使用等过程中避免发生；单个阻尼器的阻尼折减或失去阻尼作用，不会对连续梁抗震产生较大影响。

Abstract:

In recent years, viscous dampers have been widely used in the seismic design of long-span bridges in high seismic intensity areas, but the average service life of viscous dampers is far less than the design service life of bridge structures. In the whole life cycle of the bridge, the failed viscous dampers that are not detected in time or undiscovered may still be in use, which will cause a hidden danger to the earthquake resistance of the bridge. The finite element analysis is carried out for a long-span continuous beam of a new high-speed railway under various failure conditions of viscous dampers, and the shear force at the top of the pier and the relative displacement between the pier and the beam under different working conditions are obtained. The analysis is considered that all dampers or single damper becoming a similar rigid body or all dampers completely losing damping effect will seriously affect the safety of continuous beam structures, which should be avoided during the processes of design, manufacture, installation and use of the dampers. The damping reduction or loss of damping effect of a single damper will not have a significant impact on the seismic resistance of continuous beams.