基于响应面法的桥梁仿真模型修正方法研究及应用

Research and Application of Bridge Simulation Model Correction Method Based on Response Surface Method

提出采用改进响应面法进行有限元模型修正,以显式的响应面模型逼近目标函数与设计参数之间复杂的隐式函数关系,提高了计算速度与精确性。LH大桥实例验证了该方法的有效性并得出以下几点结论:建立了LH大桥单梁有限元模型,对梁挠度主成分分析可知影响梁挠度的两个最主要因素为弹性模量E与二次项效应系数;经模拟运算可知梁挠度值在L/4、L/2、3L/4 (L为梁长)处对比于单梁荷载试验结果误差分别为2. 29%、1. 97%、1. 53%,误差在可接受范围内。

The modified response surface method is used to modify the finite element model,and the explicit response surface model is used to approximate the complex implicit function relationship between the target function and the design parameters,and the calculation speed and accuracy are improved.The effectiveness of the method is verified by the case of waterlogging River Bridge and the following conclusions are obtained.The finite element model of the single beam of the waterlogging River Bridge is established.The two main factors affecting the deflection of the beam are the modulus of elasticity E and the two term effect coefficient,and the deflection value of the beam is known to be L/4,L/2 and 3 L/4(L as the beam.The error of the load test is 2.29%,1.97%and 1.53%respectively,and the error is within the acceptable range.