论文部分内容阅读
为了探讨地震行波效应对大跨桥梁主动控制地震反应和减震效果的影响规律,推导了地震动多点输入下大跨度桥梁的主动控制计算方法,对一座四跨连续刚构桥梁进行了具有不同视波速的行波输入下的主动控制计算分析,并与地震动一致输入下的计算结果进行比较。结果表明,行波效应对该大跨连续刚构桥梁的主动控制地震反应和减震效果影响显著,对主梁和桥墩均会在较低视波速地震行波输入时表现出不利影响,且对高墩的不利影响大,对低墩的不利影响小。行波效应对纵桥向主动控制的减震效果具有较大不利影响。为此,建议在确定主动控制系统的参数时应考虑地震行波效应的影响以确保控震效果。
In order to study the influence of seismic wave effect on the active control of long-span bridges, the active control method for long-span bridges under multi-input of ground motion is deduced. A four-span continuous rigid frame bridge with The analysis and calculation of active control under different apparent wave velocities are compared with the results under the same input of ground motion. The results show that the traveling wave effect has a significant influence on the seismic response and the damping effect of the active control of the long-span continuous rigid-frame bridge. Both the main girder and the bridge pier have an adverse effect on the seismic wave input with a lower apparent apparent velocity. The adverse effects of high piers are large and the adverse effects on low piers are small. The traveling wave effect has a great adverse effect on the damping effect of the active control of the longitudinal bridge. For this reason, it is suggested that the influence of seismic traveling wave effect should be considered when determining the parameters of active control system to ensure the seismic control effect.