铅阻尼器在自锚式悬索桥横向减震设计中的应用研究

Study on design method of energy-dissipating earthquake-reduction along transverse of self-anchored suspension bridge by using lead dampers

某自锚式钢桁架悬索桥结构主跨408m,采用双层桥面,2根主缆为空间线形布置。本文根据自锚式悬索桥独特的动力特性,提出在悬索桥主梁与过渡墩、辅助墩之间沿横向设置铅挤压阻尼器的消能减震设计方案,以控制悬索桥的横向地震反应。根据风、行车和地震荷载等各种工况可能引起的支座剪力值,提出了铅挤压阻尼器临界滑移荷载值的确定方法。研究表明,同时采用铅挤压阻尼器和粘滞阻尼器的消能减震技术,可以有效地减小悬索桥的横向地震反应,可供工程实践参考。

For the self-anchored steel truss suspension bridge, the span of which is 408m, the double floors of deck are adopted. The disposal shape of two main cables is three-dimensional. Based on the particular dynamic characteristic of self-anchored suspension bridge, the lead extrusion dampers are proposed to install between the deck and the anchor （auxillary） piers to improve the transverse seismic response of the bridge structure. How to choose critical extrusion load value is discussed according to the shearing force of bridge bearing caused by various load cases, such as wind, vehicle and earthquake. The analysis shows that the transverse earthquake action of the bridge can be reduced effectively by simultaneous application of viscous damper and lead extrusion damper, and can be used as a reference to engineering practice.