Condition Assessment of Stay Cable Forces Based on Variation and Trend Coefficients

Abstract:

To efficiently utilize the vast measured data,a new approach is proposed for the condition assessment of stay cable forces based on the variation and trend coefficients.This method uses the basic assessment value of stay cable forces as the initial value and gives each stay cable a weight coefficient as well as other two newlyproposed significant coefficients,the variation and trend coefficients.The variation coefficient is determined by the degree of grey slope incidence,which reflects the entire difference between the measured and designed stay cable forces.The trend coefficient is obtained by the time series analysis,which reflects the developing trend of stay cable forces and structural safety.The proposed assessment method is simple and practical but with persuasive theoretical study and sufficient consideration.Every data measured in the realtime measurement can be used to give the assessment results which are not only for a stay cable condition at a time point but also for the entire inservice period.The whole idea and procedure of assessing stay cable forces are given in detail.A case study is finally conducted to show and prove the advantages of the proposed method.

Key words:cablestayed bridges; condition assessment of stay cable forces; weight coefficient; variation coefficient; trend coefficient