分段施工PC梁桥线形的分形预测方法

充分考虑到分段施工PC梁桥施工阶段线形变化的非线形,复杂性和随机性,提出一种基于分形理论的节段线形预测方法。采用滚动选取预测样本降低原始误差累计的方法,建立了节段施工线形预测理论模型。将此模型应用于黄河大桥悬臂施工线形预测控制中,按节段施工周期依次预测下一节段的线形指标,结果证实了分段施工PC梁桥线形变化的分形特征,与实测和理论值相比,预测值具有较高的工程精度。

Fractal Predictive Method for the Alignment of the Segmental Construction PC Girder Bridge

Considering the nonlinearly changing, complexity and randomization of the Alignment con- trol to prestressed concret bridge （PC） in the construction stage, a new method called Fractal Predic- tive Method is proposed based on the fractal theory. In the way of rolling selecting samples to reduce the accumulative errors, the Fractal Predictive Model for the Alignment of the Segments was estab- lished. Then the proposed method was applied to forecast the segmental alignments of the Huanghe bridge. The predictive results show that the deformation of the segmental alignments are charactered with fractal nature and self similarity. Comparing to the measured and academic values, the forecasts has relatively high prediction accuracy and the new method is a feasible deformation prediction method in the forecasting field .