摘要
为了更清楚新型钢桁腹预应力混凝土组合梁桥的力学性能,以一座钢桁腹预应力混凝土组合梁桥为工程背景,采用精细化空间梁格模型进行了比较分析。研究表明:恒载作用下全桥各个截面都存在明显的剪力滞效应,但顺桥向位置不同其不均匀性也有差异;由于桥面板局部刚度较低,钢腹杆节点疲劳问题较为突出;取消了上下钢弦杆,顶底板混凝土的预应力效率大幅提高。
In order to clearly get the mechanical characteristic of the new-type steel truss-web and prestressed concrete composite girder bridges,a comparative analysis is performed by adopting fine spatial grillage model on the background of a style steel truss-web and prestressed concrete composite girder bridge.The results show that the shear lag effect in every top and bottom flange plates is obvious under constant load,the uneven dispersion of the shear lag effect is different with different position along the bridge.Due to the lower local stiffness of bridge deck,the fatigue problem of the joint in steel truss web is prominent and the prestressing efficiency is improved for cancelling the upper and lower chords.
出处
《上海公路》
2017年第1期40-43,共4页
Shanghai Highways
关键词
钢桁腹梁
预应力混凝土
剪力滞效应
节点疲劳
预应力效率
steel truss-web girder
prestressed concrete structure
shear lag effect
joint fatigue
prestressing efficiency
