卡尔曼滤波法在大跨连续梁桥施工控制中的应用

针对应用卡尔曼滤波法处理在大跨连续梁桥结构施工中内力和挠度与设计不一致的问题。以金塘大桥西通航孔桥为例,根据工程控制论思想,通过滤去随机噪声,得到系统统计意义上无偏的预应力混凝土主梁标高的最优估计值;结合正装计算法预测最终的成桥线形,以确定并提高桥梁各控制点处的施工预拱度和计算精度。由施工控制模拟计算得出了各施工节段预拱度的Kalman最优一步预测值;通过对左幅在成桥线形下的实测标高和设计标高的数据分析,结果表明,主梁成桥线形符合设计要求,说明Kalman滤波法在施工过程中能对各种噪声进行有效控制,并且能较好地应用于此类桥梁的施工控制中。

Application of Kalman Filtering Method in Construction Control of Continuous Beam Bridge with Large Span

According to the problems for the inconsistency of application of Kalman filtering method processing internal force and deflection in structure construction and design of continuous beam bridge with large span,based on the construction of western navigation opening bridge of Jintang Bridge,combined with engineering cybernetics thought,optimal estimated elevation value of unbiased prestressed concrete girder is obtained in statistical sense of system by filtering random noise.Combined with forward-analysis method,final bridge line is predicted,construction camber and calculation precision at different control points of bridge are determined and improved.The optimal predictive value of camber in different construction segment is obtained by simulation in construction control.Based on the data analysis of measured elevation and design elevation for left-range under bridge line,the results show that the bridge line of main girder meets the design requirements,which shows that Kalman filtering method can effectively control various noise,and can be applied in construction control of similar bridges.