纵坡为5%下的曲线桥减震性能研究

Study on the Seismic Performance of Curved Bridge with a Slope of 5%

摘要: 为研究在纵坡为5%下曲线桥粘滞阻尼器减震效果的影响，以一座长度为120米的曲线桥为原型，按照相似理论制作了该桥的1/10缩尺试验模型，设计了一致激励下四种地震波输入的试验工况，进行设置阻尼器前后的模型桥振动台试验。结果表明：安装粘滞阻尼器后，模型桥一阶频率略变小，阻尼比略变大，说明粘滞阻尼器对曲线桥提供了一定的附加阻尼。在一致激励下，主梁的跨中切向和径向位移、墩顶切向位移和径向都有所减小，墩底应变也得到了有效控制。

Abstract: In order to study the effect of the damping effect of the viscous damper on the curved bridge with longitudinal slope of 5%, the test was based on a curved bridge with a length of 120 meters as the prototype. According to the similarity theory, a 1/10 scale test model of the bridge was made. The experimental conditions of four kinds of seismic waves input under the uniform excitation were designed, and the model bridge vibration table test was carried out with dampers under longitu-dinal slope of 5%. The results show that: after installing the viscous dampers, the first order fre-quency of the model bridge is slightly smaller, and the damping ratio is slightly larger, indicating that the viscous damper provides some additional damping to the curved bridge. Under the con-sistent input, the tangential and radial displacement of the beam and the pier top under longitu-dinal slope of 5% are reduced, and the bottom strain of the pier is also effectively controlled.