考虑橡胶隔震支座速度相关性的隔震桥梁地震响应研究

Study of Seismic Response of Seismically Isolated Bridges Considering Velocity Correlation of Rubber Isolation Bearings

研究了橡胶支座在桥梁工程隔震结构中的速度相关性,以及在两种不同级别地震作用下的橡胶支座响应变化.通过即时子结构试验,对隔震桥梁工程中采用三种不同阻尼的橡胶支座,在小震和大震环境中的地震反应进行了速度相关性分析.发现在大震情况下,结构响应受到了速度相关性强烈影响,高阻尼比的支座影响更加明显;不同阻尼的橡胶支座的速度相关性对整体抗震结构的地震响应起到关键作用.通过三种支座模型比较分析,发现速度无关的模型与本文研究的速度相关性模型相比,后者结果更接近试验值.

This paper explores in detail the velocity correlation of rubber bearings in seismically isolated structures of bridge engineering and its dynamic response under two different levels of earthquakes.How the velocity correlation of three types of rubber bearings with different damping affects the seismic response of seismically isolated bridges under both small and large earthquake conditions is precisely investigated through real-time substructure tests.The results of the study reveal that the velocity correlation produces a significant effect on the response of the building under the large earthquake condition,especially when high damping-ratio bearings are used,which suggests that the velocity correlation of rubber bearings with different damping ratios plays an important role in the seismic response of the whole building.Through the comparison and analysis of the three bearing models,it is found that when comparing the velocity independent model and the velocity correlation model studied in this paper,the latter yields results that are closer to the experimental value.