收缩徐变对曲线桥实测应力影响的分析

Effects Analysis of the Shrinkage and Creep on the Measured Stresses of Continuous Curved Box Girder Bridges

在顶推法施工的曲线连续梁桥的主梁内预埋的钢筋计测得的混凝土应力远大于理论计算结果,这主要是由混凝土收缩徐变变形中的非弹性变形包含在钢筋计实测值中引起的.提出了用于扣除混凝土实测应力中收缩徐变非弹性变形影响的计算方法,并且将徐变对实测应力影响计算进行了特殊考虑,在对太平沟大桥进行施工监控中使用该方法取得了较好的效果.

The measured stresses of the embedded components in concrete bridges are not same as the theoretical stresses. The reason for this phenomenon is that nonelastic strains caused by shrinkage and creep are included in measured stresses. In this paper, the method for eliminating the influence of nonelastic strains resulted from shrinkage and creep is proposed. From the example, it is shown that the proposed method is reliable to deal with the measured stresses. 