高墩系梁设置对桥墩横向地震响应的影响

Influence of High-pier Straining Beam Setting on Lateral Seismic Response of Bridge Piers

在地震高烈度地区桥梁下部结构设计时,经常会遇到桥墩较高时需要设置系梁的情况,来防止墩柱发生横向动力失稳,减小地震作用下的桥梁破坏。从大量的震害中发现未设系梁的桥墩比设置系梁的桥墩横向破坏显著。以毛林特大桥引桥下部结构为研究对象,分析E2地震作用下墩柱的横向变形和关键截面的内力,研究表明桥墩较高时系梁设置对桥墩横向抗震性能影响显著。

In the design of bridge substructure in the high-intensity area,it is often necessary to set up the straining beams when the bridge piers are higher in order to prevent the lateral dynamic instability of piers and to minimize the bridge damage under earthquake.From a large number of data for seismic hazard,it is found that the lateral damage of the bridge piers without straining beam is more obvious than that of piers with straining beam.Taking the approach substructure of Maolin Bridge as a study object,the lateral deformation of piers and the internal force of key sections under E2 earthquake are analyzed.The study shows that the setting of straining beam has the obvious influence on the lateral anti-seismic properties of bridge pier when the piers are higher.