斜拉桥结构减震设计优化研究

位于中强以上地震烈度区的大跨斜拉桥结构,如果采用传统的抗震设计方法,通常很难满足结构的抗震设计要求,因此采取一定的减震措施显得非常必要。本文以某一总长为2 088m的大跨双塔双索面斜拉桥为分析算例,对斜拉桥结构的减震设计进行了研究。合理的减震结构体系是取得良好减震效果的前提,通过分析对比,该大跨斜拉桥横向采用局部减震体系最为合理,即只在近塔辅助墩处设置横向粘滞阻尼器,其它塔、墩处采用常规的横向约束方案。为使减震结构得到更好的减震效果,还应对减震装置参数进行优化设计。由于采取了合理的减震结构体系、较优的减震装置参数,使该大跨斜拉桥取得了很好的减震设计效果。

Optimized earthquake reduction design of cable-stayed bridges

It is necessary to adopt the seismic reduction technique for the large span cable-stayed bridges which are located in the medium or stronger intensity seismic area.The seismic reduction design of cable-stayed bridge was studied by using the example of double pylons and double cable-planes with the total length of 2088m.The most reasonable transverse structural system of this long-span cable stayed bridge,which is a prerequisite for the good effect of vibration reduction,is obtained by means of setting transverse vibration reduction devices on auxiliary piers near pylons only,and other pylons and piers still accord with practical transverse restraints.The parameters of damper must also be optimized in order to get more results of vibration reduction.Because the reasonable structural system of vibration reduction is employed and the scientific parameters of dampers are set,so a good effect of vibration reduction will be taken on this cable-stayed bridge.