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首页> 外文期刊>Bulletin of earthquake engineering >Restrain of a seismically isolated bridge by external stoppers
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Restrain of a seismically isolated bridge by external stoppers

机译：外部挡块约束地震隔离的桥梁

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The current design of seismically isolated bridges usually combines the use of bearings and stoppers, as a second line of defence. The stoppers allow the development of the in-service movements of the bridge deck, without transmitting significant loads to the piers and their foundations, while during earthquake they transmit the entire seismic action. Despite the fact that stoppers, which restrain the transverse seismic movements of the deck, are used frequently in seismically isolated bridges, the use of longitudinal stoppers is relatively rare, mainly due to the large in-service constraint movements of bridges. The present paper proposes a new type of external longitudinal stoppers, which are installed in stiff sub-structures-boundaries, aiming at limiting the bridge seismic movements. The parametric investigation, which was conducted in order to identify the seismic efficiency of the external stoppers, showed that the interaction of the bridge with the stiff boundaries can lead to significant reductions in the seismic movements of the bridge. Serviceability is appropriately arranged in the paper by expansion joints and approach slabs.
机译：当前地震隔离桥梁的设计通常结合使用轴承和制动器，作为第二道防线。挡块允许桥面板在役运动的发展，而不会将大量载荷传递到墩及其基础，而在地震期间，它们传递整个地震作用。尽管在地震隔离的桥梁中经常使用限制甲板横向地震运动的限位器，但纵向限位器的使用相对较少，这主要是由于桥梁在役约束运动较大。本文提出了一种新型的外部纵向限位器，该限位器安装在刚性子结构的边界中，旨在限制桥梁的地震运动。为了确定外部塞子的地震效率而进行的参数研究表明，桥梁与刚性边界的相互作用可以导致桥梁地震运动的明显减少。通过伸缩缝和引伸板在文件中适当地安排了可维修性。

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