大跨度桥梁施工控制结构分析计算方法

为了提高大跨度桥梁施工控制中结构分析计算的精度,提出将Kalman滤波法和正装分析法结合起来进行施工控制的分析计算.应用Kalman滤波法滤去施工和测量中的随机噪声,得到结构系统统计意义上无偏的最优估计值,再结合正装计算法预测最终的成桥状态,据此确定各控制点处的施工预抛高值.结合某钢管混凝土中承式拱桥桥道系的施工预抛高值的求解问题,对该方法进行了详细论述,并以通用有限元程序ANSYS作为平台编制了相应的计算程序.实践证明该方法计算精度高,具有一定的应用推广性.

Analysis and computation method of structure for the construction control of bridges with large span

A new method combinating Kalman's filtering method and orderly-erecting analysis method was put forward to improve the analysis and computation precision of structure for the construction control of bridges with large span. Through Kalman's Filtering method, the random noise of the construction and measurement system were filtered and the best statistically unbiased estimation of the bridge structure could be achieved. Then the final line-shape of bridge could be forecasted with orderly-erecting analysis method. So the pre-camber of all the controlled points could be determined. The method was discussed in detail through solving the pre-camber of the bridge floor of the CFST half arch bridge in the construction, and the corresponding program for analysis and calculation was generated based on the common FEM software - ANSYS. The results of its application showed that that it could improve the calculation precision and can be spread widely.