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以沪蓉国道四渡河深切峡谷特大钢桁架悬索桥为工程背景,综合考虑悬索桥结构非线性与重力刚度因素影响,采用ANSYS的APDL语言编写桥梁模型修正优化程序,实现了有限元分析和模型修正的同步计算。通过对比不同的优化算法、不同的目标函数与不同的约束条件对模型修正效果的影响程度,并结合实测吊杆力数据和考虑伸缩缝刚度参数影响,提出了一种全面反映悬索桥结构特性的桥梁有限元模型实用修正方法。采用频率残差目标函数,将频率、振型参数与其他静力信息作为约束条件,进行了模型零阶优化计算。计算结果表明:修正后模型的结构静动力计算响应与实测响应之间的误差明显减小,各测点静力变形误差小于8%,振动频率误差小于5%,并且有限元模型的参数变化合理,保证了参数本身的物理意义,从而利用修正方法获得了四渡河特大桥的基准有限元模型。
Taking the Sijiahe deep gorge steel truss suspension bridge at Huluo National Road as the engineering background, considering the structural nonlinearity and gravity stiffness factors of the suspension bridge, APDL language of ANSYS was used to write the bridge model modification and optimization program to realize the synchronization of finite element analysis and model correction Calculate. By comparing the influence degree of different optimization algorithms, different objective functions and different constraints on the model correction effect, and combining the measured boom force data with the consideration of the stiffness parameter of the expansion joint, a bridge that fully reflects the structural characteristics of the suspension bridge is proposed Practical Modification of Finite Element Model. By using the objective function of frequency residuals, the parameters of frequency, mode shape and other static information are used as constraints, and the zero-order optimization of the model is calculated. The results show that the error between the calculated static response and the measured response is significantly reduced, the static deformation error of each measurement point is less than 8%, the vibration frequency error is less than 5%, and the parameters of the finite element model change reasonably , To ensure the physical meaning of the parameters themselves, so as to obtain the baseline finite element model of the Siduhe River Bridge using a modified method.