Verification Coefficient and Optimization Method for Bridge Evaluation

Abstract

Bridge load test, especially static test evaluation, is one of the most commonly utilized bridge inspection appraisal methods. Verification coefficient values are rough and could not adapt to the trend of bridge construction over the years. To improve calculation precision and evaluation accuracy, a concept of verification coefficient of the impact factor is proposed. A new verification coefficient calculation method based on the analysis of the differences between the calculation model and actual structure and combined with the characteristics of practice and calculation modeling error is presented. Then a theoretical verification coefficient calculation method is established, and the range of verification coefficient values of different parameters is summarized. After calculating the deviation percentage, research is conducted to reduce bridge assessment misjudgment. A practical optimization method for bridge static test evaluation is established. This optimization method comprises three parts, namely, correction calculation of the theoretical value, optimization analysis of the verified coefficient range, and evaluation algorithm for the deviation percentage. Numerical examples show that the proposed optimization method can reduce the deviation percentage and improve the accuracy of evaluation results. The method is suitable for all bridge inspection applications.