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为准确获取实际结构中的收缩与徐变时变规律,提高长期下挠预测的准确性,提出了在实体结构中直接辨识结构收缩徐变的理论与预埋式徐变自辨识系统,通过试验梁试验进行了初步验证。结果表明在采用同样的结构变形计算方法的前提下,通过徐变自辨识系统所得的试验梁徐变系数曲线可更好地代表结构的真实徐变,梁体跨中变形计算采用自辨识徐变系数的预测情况较现行规范公式预测的结果更接近实测变形。提出的预埋式混凝土徐变自辨识系统能有效识别出结构体的收缩徐变,可极大提高对混凝土结构变形预测的准确性,为大跨径梁桥的长期变形预测提供了新手段。
In order to accurately obtain the shrinkage and creep time-varying law of the actual structure and improve the accuracy of the long-term deflection prediction, a theory and embedded creep self-identification system for directly identifying the structure shrinkage and creep in the solid structure are proposed. Beam test conducted a preliminary verification. The results show that the creep coefficient curve of the test beam obtained from the creep self-identification system can better represent the real creep of the structure under the same method of structural deformation calculation, and the self-identification creep The prediction of the coefficient is closer to the measured deformation than the prediction of the current standard formula. The proposed embedded concrete creep self-identification system can effectively identify the shrinkage and creep of the structure, which can greatly improve the accuracy of the prediction of the deformation of the concrete structure and provide a new method for the long-term deformation prediction of the long-span beam bridge.