Simple Analytical Model for Vibration Frequency Calculation of Anchor Span Strand in Suspension Bridges

Abstract

A simple analytical model for calculating the vibration frequencies of anchor span strands in suspension bridges is proposed in this study. The vibration frequencies of strands are important indicators of tension force and critical in construction control. Most existing methodologies either ignore the connecting rods in anchor spans or require a complex finite-element analysis to ensure accurate calculations. A simple model is proposed for rapid and efficient analysis that includes the geometric and material properties of connecting rods. The calculation results of the proposed model are compared with and verified against those of existing solutions in literature and finite-element simulations. Afterward, the proposed method is applied to the Nanxi Yangtze suspension bridge. The effects of the length and material parameters of connecting rods on the calculation of strand tensions are parametrically discussed. Conclusions and recommendations for future strand tension analysis and control are also presented.