三主桁斜拉桥桥面板剪力滞效应研究  

Shear lag effect research of slab in three-truss cable-stayed bridges

作　　者：罗许国[1] 戴公连[1] 

机构地区：[1]中南大学土木建筑学院

出　　处：《西安建筑科技大学学报（自然科学版）》2008年第3期297-301,367,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(40671153)

摘　　要：三主桁斜拉桥公路桥面板支撑在钢桁梁上直接承受汽车荷载,桥面板中存在剪力滞后现象.采用了空间有限元模型对三主桁斜拉桥板桁组合结构的混凝土和钢正交异性桥面板的剪力滞后情况进行了分析,计算结果表明,板桁结合梁桥面板中存在较明显剪力滞后效应,尤其在最内索锚固截面和中间支座截面附近纵向应力的横向分布更不均匀,其纵向应力不均匀系数ξ为2.54-3.07之间,因此设计时对这些部位必须予以充分考虑.In the three-truss cable-stayed bridges, the slab supported by steel truss bears the vehicle loads directly. Shear lag of the plate will appear when the loads act on it. The paper analyses the shear lag effect of slab in three-truss cable-stayed bridges through the spatial finite element model. The calculational results indicate that there are shear lag obviously in the slab of plate-truss composite girder, especially in the cable anchor sections near the tower and middle bracing sections. Its uneven coefficient（） of longitudinal stress is 2. 54-3.07. Therefore these sections should be considered enough in designing.

关 键 词：三主桁斜拉桥 剪力滞效应 板桁结合梁 空间有限元 桥面板 

分 类 号：U448.212[建筑科学—桥梁与隧道工程]