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为了解大跨径预应力连续箱梁桥高强混凝土的收缩徐变规律,预测其长期变形,在箱梁跨中埋置测量传感器,直接测量混凝土的收缩应变,通过增量运算理论分离出混凝土的徐变应变,对于具体桥梁的C55高强混凝土实测数据显示,现行规范的收缩徐变模型总体上会低估高强混凝土的收缩作用,而高估徐变作用。用短期实测数据修正后的混凝土收缩徐变模型预测桥梁恒载下的长期变形,由两种类型修正式的挠度估算值与实测值的比较可知,其预测精度受混凝土短期实测应变数据的完整性﹑测量精度及修正式与实测数据吻合程度的影响。
In order to understand the shrinkage and creep regularity of high-strength concrete for long-span prestressed continuous box girder bridge, predict its long-term deformation, embed measuring transducer in the span of box girder, measure the shrinkage strain of concrete directly and separate out the concrete by incremental calculation theory Creep strain, C55 high-strength concrete for concrete bridges measured data show that the current standard shrinkage and creep model will generally underestimate the shrinkage of high-strength concrete, while overestimating the creep effect. The long-term deformation of bridge under constant load is predicted by the shrinkage and creep model of concrete modified with short-term measured data. Comparing the estimated values of the two types of modified deflections with the measured values, the prediction accuracy is affected by the short-term measured strain data integrity ﹑ Measurement accuracy and correction and measured data consistent with the degree of impact.