基于荷载试验的大跨斜拉桥有限元模型修正方法研究

Research of Modification Method of Finite Element Model for Large Spanning Cable Stayed Bridge Based on Loading Test

为对大跨斜拉桥进行在线监测和结构安全评估,很有必要建立竣工阶段的有限元模型作为评价基准模型.本文介绍了某斜拉桥竣工模型的建立方法,比较了成桥荷载试验结果与模型计算结果,提出了基于实测数据的模型修正方法,利用MATLAB软件计算了参数修正值.经过分析,模型修正后的误差在合理范围内,本文采用的修正方法具有实用价值.

In purpose of conducting online observations and structural safety evaluations for large spanning cable stayed bridge, it is necessary to build finite element models of bridge with stage of completion as accessing standard model.This paper instructed building methods of finite element model of a bridge, comprised results of static tests and of that model, proposed modification method of that model based on test data, and calculated modification values of parameters by using MATLAB software.After analysis, errors of modification models are in reasonable ranges.The modification method is of practical value.