桥梁结构基于高维模型拟合响应面的参数识别

为提高响应面法在桥梁结构参数识别中的计算精度,提出了基于高维模型拟合响应面的参数识别方法.即采用HDMR响应面法拟合结构响应面,并基于该响应面进行结构参数的识别.研究了HDMR响应面的基本构造方法,阐述了在响应面基础上通过有约束最小二乘优化实现参数识别的一般过程.以一座连续梁及一座独塔斜拉桥为算例进行分析,探讨了该方法在结构参数识别中的计算精度及效率.结果表明,相比传统响应面法,该方法在计算精度上具有显著优势.同时也验证了该方法在大型桥梁结构参数识别中的可靠性和适用性.

Bridge Structural Parameters Identification Method Based on HDMR Response Surface

A method for structural paramters identification based on high dimentional model representation (HDMR) response surface is proposed to improve the response surface method applied to bridge structure parameters identification. With the HDMR response surface method, the implicit function relationship between structural parameters and responses is obtained, which is then applied to identifing the structural parameters through a constrained least square optimization strategy. The construction process of HDMR response surface is researched and based on which the implementation program of structural parameters identification is presented. Numerical examples, which contain a continuous beam structure and a single pylon cable stayed bridge, are given to investigate the computational accuracy and efficiency of the proposed method in structural parameters identification. The analysis results show that the proposed method possesses a remarkable advantage in computational accuracy, which is reliable and applicable in the parameters identification of large bridge structures.