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预应力混凝土梁在外部环境和材料本身劣化的作用下,预应力筋与混凝土之间的黏结力存在削弱现象。黏结退后的预应力混凝土桥梁将发生截面应力重分布和结构内力重分布,为了确定由于锈蚀引起的剩余黏结应力的减少对构件极限承载力的影响,通过有限元模拟钢筋和混凝土之间的黏结性能退化来推演简支梁在寿命期内的极限承载能力,得到了即便不考虑钢筋面积的减少和混凝土截面削弱情况,最大剩余黏结应力和梁体的极限承载力的关系,为研究桥梁全寿命整体性能提供基础数据。
Prestressed concrete beams in the external environment and the material itself under the effect of deterioration, prestressed tendons and concrete weakening the bond between the phenomenon exists. In order to determine the influence of the decrease of residual bond stress caused by corrosion on the ultimate bearing capacity of the prestressed concrete bridge, the cross-section stress redistribution and the structural internal force redistribution will occur. The bond between steel bar and concrete is simulated by finite element method Performance degradation to deduce the ultimate bearing capacity of simply supported beams in the lifetime of the bridge, obtained the relationship between the maximum residual residual stress and the ultimate bearing capacity of the beam without considering the reduction of reinforced area and concrete section, The overall performance provides the basic data.