溪洛渡拱坝应力应变计算及施工期应力统计模型

Calculation of Stress and Strain for Xiluodu Arch Dam and Stress Statistical Model in Construction Period

针对溪洛渡拱坝埋设的差阻式应变计组的组合特点,推导了应变计组不同埋设方式的单轴应变计算公式,采用变形法将单轴应变转换为单轴应力,并计算出主应力,由此建立应力统计模型,时效分量采用3个指数函数累加来表示。实例应用结果表明,该统计模型拟合精度较高,可用于解决溪洛渡拱坝应力应变资料的预处理问题。

For the combination characteristics of differential strain gauges arrays embedded in XiIuodu arch dam, this paper deduces uniaxial strain calculation formula of strain gauge arrays under different embedded mode. And then, the uniaxial strain is transformed into single axial stress with deformation method and the principal stress is calculated. Finally, the stress statistical model is established. At the same time, the ageing component is represented with three cumula tive exponential functions. Application results show that the statistical model has higher fitting precision, which can be used to solve the preprocessing problem of stress strain data for Xiluodu arch dam.