大跨连续梁桥竖向抗震性能研究

Research on the Vertical Seismic Performance of Long-span Continuous Girder Bridge

随着监测手段的不断进步,地震动的记录越来越完善,很多地震动的竖向分量被检测到并引起了专家学者的重视,尤其是高烈度区和震中区,地震动竖向分量甚至比水平分量还要显著。文章在综合分析国内外对多向地震以及多维隔震技术研究现状的基础上,研究了一种新型三维隔震装置(高阻尼橡胶碟簧三维隔震装置)在大跨度桥梁竖向抗震设计中的应用。结果表明:仅在桥墩安装三维隔震装置是最有效、经济的安装位置;竖向地震动分量对主梁纵向加速度有着放大作用,考虑竖向地震作用时,跨中竖向加速度不容忽视;三维减隔震装置较水平隔震支座有着更好的减隔震效果。

With the continuous progress of monitoring methods,the records of seismic motion are becoming more and more complete.Many vertical components of seismic motion have been detected and attracted the attention of experts and scholars,especially in the high intensity and epicenter regions,where the vertical component of seismic motion is even more significant than the horizontal component.Based on a comprehensive analysis of the current research status of multi-directional earthquake and multi-dimensional isolation technology at home and abroad,this paper studies the application of a new three dimensional isolation device(high damping rubber disc spring three dimensional isolation device)in the vertical seismic design of long-span bridges.The results show that the installation of three dimensional isolation device on the bridge pier is the most effective and economical installation location.The vertical ground motion component has an amplification effect on the longitudinal acceleration of the main beam.When considering the vertical earthquake action,the vertical acceleration in the mid span cannot be ignored.Three dimensional seismic isolation device has better seismic isolation effect than horizontal isolation bearing.