摘要
以某钢桁公铁斜拉桥为研究对象,建立空间有限元模型,从斜拉桥自振特性方面,分别就索塔高跨比、边中跨之比、主梁高跨比、辅助墩位置、主塔刚度、主桁斜竖杆刚度等一些特征参数展开了深入的比较研究。研究表明,对大跨度钢桁梁斜拉桥,最佳索塔高跨比为1/3;边中跨之比应不小于0.53;最佳的辅助墩布置范围在最外侧拉索索位与中索(与最长索和最短索距离相等的位置)索位之间;主梁高跨比对斜拉桥结构刚度影响不大;此外,桥塔刚度和主桁斜竖杆刚度是斜拉桥面内和面外稳定的主要力学参数。
A steel trussed girder cable-stayed bridge is built to research the effects of different parameters on the dynamic characteristics of the long span cable-stayed bridges. In this research, the effects of height of the pylon-to-span ratio, side span- to-middle span ratio, height of main truss to-span ratio, assistant pier distribution form, stiff of the pylon and stiff of main truss elements on the dynamic characteristics are mainly discussed. The results show that, for long span cable-stayed bridge, the best height of the pylon-to-span ratio is 1/3, the side span-to-middle span ratio should be no less than 0.53, the best assistant pier distribution range is from the cable with longest length to the one with middle length, little effect of height of main truss to-span ratio on the structure dynamic properties, and the inside and outside stability of cable-stayed bridges are seriously influenced by the change of the stiff of the pylon and main truss.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2009年第20期73-77,共5页
Journal of Wuhan University of Technology
关键词
斜拉桥
动力性能
参数
刚度
cable stayed bridge
dynamic characteristics
parameters
target
