支座脱空状态下钢筋混凝土空心板桥面形态变化研究

Research on the shape change of reinforced concrete beam under the state of bearing void

为开展不同支座脱空状态下钢筋混凝土空心板桥的形态变化研究,利用有限元分析软件建立了一座梁长为20 m的精细化空心板桥实体模型,进而获取了不同支座脱空工况下的边梁、中梁及跨中截面的形变位移值。通过与支座正常工作状态下桥面位移的对比分析,结果表明:空心板桥支座脱空会影响桥面的形态变化且对桥梁跨中截面的影响程度最大,但对沿纵桥向边梁与中梁的挠度变化影响较小,同时其整体位移形变值与临近脱空支座位置处的局部区域挠度值会随支座脱空数量的增多而加大。

In order to study the shape change of reinforced concrete hollow slab girder under different bearing void conditions,a refined solid model of hollow slab bridge with a beam length of 20 m is established by using the finite element analysis software,and then the deformation displacement values of side beam,middle beam and midspan section under different bearing void conditions are obtained.Through the comparative analysis of the displacement of the bridge deck under different bearing void conditions,the results are as follows:the results show that void bearing of hollow slab girder bridge will affect the shape of the bridge deck and the midspan section of the bridge to the greatest extent,but it has little influence on the deflection of the side beam and the middle beam along the longitudinal direction of the bridge.At the same time,the overall displacement deformation value and the local area deflection value near the void bearing location will increase with the increase of the number of void bearing.