基于复阻尼模型的连续刚构桥地震响应分析

Analysis of seismic responses of continuous rigid-framed bridge based on complex damping

为了研究复阻尼模型下连续刚构桥的地震响应,文章讨论了利用复阻尼模型求解连续刚构桥地震响应的方法,并按相同的阻尼比,分别采用复阻尼模型和黏性阻尼模型计算了后渚连续刚构桥在不同地震动作用下的响应,将计算结果进行对比,分析了两种不同的阻尼模型对地震响应影响的差别。结果表明,采用不同类型的阻尼对地震响应影响很大,以复阻尼计算出的响应幅值作为设计值,更加偏于安全,对于保证桥梁结构的抗震安全更可靠。

In order to study the seismic responses of continuous rigid-framed bridge under complex damping model, the methods for solving continuous rigid-framed bridge seismic responses by using viscous damping and complex damping models are discussed. And with equal damping ratio, complex damping model and viscous damping model are used to calculate the responses of the Houzhu continuous rigid-framed bridge under various seismic ground mo- tions separately. The contrast of calculated results is made and the difference of seismic responses between two dif- ferent damping models is analysed. It will is shown that damping has notable influence on seismic responses. It is more safe using complex damping to calculate response amplitude as the design value. It will ensure the safety of seismic resistance for bridges.