摘要
为研究索力作用下锚拉板式混凝土索梁锚固体系的受力性能,以五河淮河大桥为工程背景进行实桥试验和有限元分析。选取该桥0号节段混凝土锚拉板进行实桥试验,测试锚拉板在分级索力作用下的应力及变形,采用ANSYS软件建立有限元模型,计算2种连接方式下(考虑混凝土主梁与钢锚拉板的固结与滑移)的应力分布与锚拉板变形。结果表明,钢锚拉板与混凝土主梁在固结或滑移连接方式下,斜拉索锚固区域的应力分布基本相同,但连接区域的应力分布及锚拉板变位差别显著;测试的锚拉板应力和位移与荷载呈现良好线性相关性,最大测点应力296 MPa,结构仍处于弹性工作状态;锚拉板应力分布的实测值与有限元计算值吻合,板件应力扩散和传递效果良好;连接区域的实测应力和位移与滑移方式下的有限元分析较吻合,但摩擦系数不主导滑移结果。
To study the mechanical performance of the anchor tensile plate cable anchorage system in concrete girder under the action of the cable tension,the test and finite element analysis of the steel anchor tensile plate stay cable anchorage system in the concrete main girder of the actual bridge of Wuhe Huaihe River Bridge were carried out.The anchor tensile plate in the segment No.0of the main girder of the bridge was selected and tested.The stress and displacement of the anchor tensile plate under the different levels of the stay cable tension were measured.The finite element model for the anchor tensile plate was set up,using the software ANSYS and the stress distribution and the anchor tensile plate displacement under the 2kinds of the connecting ways（the rigid fixity and sliding connecting of the anchor tensile plate with the concrete main girder）were calculated.The results show that under the connecting ways of the rigid fixity or sliding connecting of the anchor tensile plate with the concrete main girder,the stress distribution in the stay cable anchorage zone is basically identical,but the differences of the stress distribution and the anchor tensile plate displacement in the connecting zone are obvious.The measured stress and displacement of the anchor tensile plate exhibit good linear correlation with the applied load of the stay cable tension.The maximum stress of the measurement points is 269 MPa and the structure is still in the working state of elasticity.The measured values and the values calculated by the finite element for the stress distribution of the anchor tensile plate are agreeable.The effect of the stress dispersing and transmitting of the plate components is sound.The measured stress distribution and displacement of the anchor tensile plate in the connecting zone are agreeable with the stress distribution and displacement calculated by the finite element for the connecting way of the sliding,but the frictional coefficients do not govern the sliding results.
出处
《桥梁建设》
EI
CSCD
北大核心
2016年第3期11-16,共6页
Bridge Construction
基金
国家自然科学基金资助项目(51108338)
中央高校基本科研业务费专项资金项目(0220229076)
安徽交通集团科技资助项目(2012)~~
关键词
斜拉桥
锚拉板
混凝土主梁
索梁锚固体系
实桥试验
有限元法
应力
变形
cable-stayed bridge
anchor tensile plate
concrete main girder
cable anchor system in girder
test of actual bridge
finite element method
stress
displacement
