摘要
以某铁路斜拉桥为工程背景,研究了塔、梁间纵向弹性约束刚度取值对斜拉桥动力特性及主塔地震反应的影响。研究结果表明:纵向弹性约束对斜拉桥体系纵漂及主梁反对称竖弯振型影响较大。与漂浮体系相比,在弹性约束刚度的合理取值条件下,弹性约束使塔顶位移及塔身控制截面的弯矩有较大幅度的降低,但使部分塔身控制截面的剪力增大。
Taking a railway cable - stayed bridge as project background, the influnce of longitudinal elastic constraint installed between main tower and main girder on structural dynamic charateristic and seismic response of main tower was studied. The results show that the influnce of longitudinal elastic constraint on mode shapes of structural longitudinal floating and anti - symmetric vertical bending of main girder is significant. Compared with entirely floating system, elastic constraint results of displacement in the substantial decreases at tower top and bending moment at the critical sections of main tower, but shear force increases at the partial critical sections in condition of reasonable value for the stiffness of elastic constraint.
出处
《铁道科学与工程学报》
CAS
CSCD
2011年第2期21-26,共6页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(10902045)
铁道部科技研究开发计划项目(2008G031-k)
关键词
斜拉桥
纵向弹性约束
动力特性
地震反应
cable -stayed bridge
longitudinal elastic constraint
dynamic charateristic
seismic response
