通过最小二乘法和最优寻求定权对灰色 GM(1，1)预测模型的背景值及初始值进行了修正，采用多点滑动平均的方法对原始序列进行了优化，提出了改进的桥梁施工灰色控制系统。在大跨度桥梁悬臂施工控制中，采用全数据模型作为原始序列，对改进的灰色控制系统进行验证。结果表明，浇筑混凝土时的预测位移与实测位移最大差值为5.1 mm；合龙前梁体理论线形与实测线形吻合度高，成桥后梁体完全符合平顺性要求。该模型具有较强的可操作性，预测精度高，对复杂的大跨度桥梁施工控制有很好的参考价值。%T he background value and initial value of the GM ( 1,1) prediction model were refined by using least squares theory and automatic optimization. And the original sequence of the prediction was optimized by multi-point moving average,then an improvement construction grey control system of bridge was put forward. T he improvement construction grey control system was verified by using all-data model as original sequence in cantilever construction control of long-span bridge. T he results show that the maximum difference between the predicted displacement and the measured displacement is 5. 1 mm,and the theory values of linear of the beam before closure are closed to the measured values,completely meet the standard requirements of smoothness at finished stage. T his model can provide certain reference value for cantilever construction control of long-span bridges w ith strong operability and high prediction accuracy.
展开▼
