曲线桥梁漂浮抗震体系地震模拟振动台试验及有限元分析

针对曲线桥梁地震中损毁严重、修复困难等问题，提出曲线桥梁漂浮抗震体系基本概念、结构组成及设计方法，并探讨其工作原理。将漂浮抗震体系概念、方法用于制作的1/20曲线桥梁模型进行地震模拟振动台试验及有限元分析。结果表明，该模型桥梁在地震发生后桥墩顶加速度峰值较墩底降低率最大为24.6%，梁体在桥墩上部成漂浮状态能减小桥墩受力；试验过程中模型未倒塌，表明该体系抗震性能良好，可用于高烈度抗震地区的曲线桥梁设计。

haking table test and finite element analysis of curved bridge which using floating seismic system

In view of the curved bridge damaged severely in the earthquake and repaired difficult after the earthquake, the floating seismic system of curved bridge was been proposed; the basic concept, composition and design method of the floating systerm were been analysed, the working principle of the floating system was been discussed as well. A 1:20 scale curved model bridge was been built with floating seismic system, shaking table test and finite element analysis were also been conducted for this model bridge. The results show that when the model bridge designd by floating seismic system, comparing the peak acceleration at the top of the pier with the peak acceleration at the bottom, the maximum reduction rate was 24.6 percent; because of the beam floated above the pier, the force of the pier reduced; the model bridge was not collasping in the test, it indicate that the seismic performance of the floating seismic system is good and can be used to design a curved bridge which is in the high seismic intensity area．