基于有限元和数据重构的连续梁移动荷载识别研究

Moving Loads Identification of Continuous Beam Based on Finite Element Method and Data Reconstruction

以公路桥梁中常见的连续梁为研究对象,提出了一种基于有限元和数据重构的移动荷载识别方法。采用有限元方法和Newmark方法编写连续梁在移动荷载作用下动力响应的计算程序,获得桥梁的位移响应;由切比雪夫多项式重构位移响应;由Newmark方法重构桥梁的速度和加速度响应;通过重构的数据采用正则化技术进行移动荷载识别。研究了荷载移动速度、荷载大小和桥梁跨数对移动荷载识别结果的影响。

Taking the continuous highway bridges as the research object,a moving load identification method based on finite element method and data reconstruction was proposed.The finite element method and the Newmark method were used to write the calculation program of the dynamic responses of the continuous beam under moving loads.The displacement responses of the bridge were obtained.Displacement responses were reconstructed by Chebyshev polynomials.The velocity and acceleration responses were reconstructed by the Newmark method.Then the moving loads were identified by regularization techniques using the reconstructed data.The effects of the loads moving speed,the loads value and the number of the bridge spans on the moving loads identification were studied.