灰预测模型在连续梁桥施工监控中的应用研究

The Application Research of Grey Forecasting Model in the Continuous Girder Bridge Construction Monitoring Considering Shear Deformation Effect

为保障桥梁施工线形与设计线形一致性及施工过程的安全性,采用灰色系统理论,以实际连续刚构桥梁施工过程中不同工况下的挠度及应力数值模拟结果及现场实测结果作为原始微分序列建立GM(1,1)模型,以Matlab作为计算工具编制相应的计算程序,预测悬臂施工过程中的挠度及应力变化,并以此来指导桥梁现场施工.结果表明:预测结果与现场实际测试结果较为吻合,施工过程各节段应力均在设计容许范围内,最终成桥线形与设计线形保持了较好的一致性.

In order to ensure the consistency of bridge construction alignment and designed alignment and the safety of construction process,the grey system theory was adopted.GM(1,1)Model was established by numerical simulation results of deflection and stress under different working conditions in the process of actual continuous rigid frame bridge construction and measurement results as original differential sequence.Corresponding calculation program was prepared by Matlab as calculation tool.On this account,deflection change and stress change in the process of cantilever construction can be predicted,which can guide the bridge construction.The results indicated that the predicted results were in good agreement with the actual test results.The stress of each section in the construction process was within the designed allowable range.Finally,the bridge alignment was in good agreement with the designed alignment.