预应力连续箱梁桥混凝土收缩徐变效应

混凝土收缩徐变效应对桥梁结构内力以及线形产生不可忽视的影响。混凝土收缩徐变机理复杂,影响因素多,随机变化量大,它对结构性能的影响至今难以得到精确的解答。文章以某改建连续箱梁桥为工程背景,通过建立有限元模型,模拟分析了预应力混凝土连续箱梁桥在成桥阶段和若干年后的收缩徐变效应,经过理论计算,得出混凝土收缩徐变对结构内力、线形的影响规律,期望能为同类桥梁的设计和施工提供参考。

The Effect of Concrete Shrinkage and Creep on Prestressed Continuous Box Girder Bridge

The effect that the concrete shrinkage and creep has n the internal forces and lineshape of the bridge structure can never be ignored. The mechanism is very complicated, and there are many factors with random variation, therefore, so far it is dififcult to determine the accurate impactt that the concrete shrinkage and creep may have on structural performance Based on an rebuilt continuous girder bridge, this paper aims at a simulation analysis the concrete shrinkage and creep effects of pretested concrete continuous box girder bridges at completion stage and some years later by building the ifnite element model. The inlfuence of concrete shrinkage and creep on internal force and lineshape is obtained after theoretical calculation, and it is hoped to provide a reference for the design and construction of similar bridges.