三跨独柱墩曲线梁桥两端横隔板加长对受力性能影响分析

针对目前独柱桥墩曲线箱梁桥在偏载作用下易出现主梁横向侧移及支座脱空的现象,以1座典型的3×20 m、中设2个独柱墩的3跨钢筋混凝土曲线箱梁桥为背景,采用空间分析方法,对其在设计荷载作用下的控制截面的空间受力行为及影响参数进行了分析。重点对比了该曲线梁桥端横隔板接长加固前后应力、挠度和端支反力比的影响。结果表明,对此类曲线梁桥,端横隔板的加长对改善控制截面加载工况下控制截面挠度和应力的分布影响甚微。端横隔板加长后,两端支座的支反力比减小,分布更加均匀。端横隔板的加长增加了该桥的抗倾覆安全系数。同时,内侧增设支座,会较早出现负反力,虽负反力数值不大,但仍值得引起注意。

Partition Lengthen of Both Ends Clapboard Effected on Mechanical Performance about Three Span Single Column Pier of Curved Bridge

At present,single column pier of the curved bridge is easy to appear the girder of the lateral displacement and the bearing void in partial load.With the background of a typical three-span reinforced concrete curved box girder bridge(3 × 20 m,2 single column pier),the spatial analysis method is used to analyze the spatial mechanical behavior and parameters influence of the controlled section under design load effect.Then,the author focuses on the comparison of the stress,the deflection,the end proportion of the reverse force before and after the partition lengthen of both ends clapboard.The results show that the partition lengthen of both ends clapboard improves little the controlled section of the stress and deflection,the end proportion of the reverse force reduces and its distribution becomes more uniform after the partition lengthen of both ends clapboard,which increases the resistive overturning safety coefficient,at the same time the negative reverse force appears earlier by adding inside bearing,but it is worthy attention that the negative reverse force is small.