EVALUATION METHOD OF VIBRATION CHARACTERISTICS OF MAIN STRUCTURE OF RAILWAY BRIDGE CONSIDERING NON-STRUCTURAL MEMBERS

Abstract

 In order to improve the accuracy of estimating the cross-sectional rigidity of railway bridges, this study quantified the effect of non-structural members on the vibration characteristics of the main structure on the basis of actual bridge measurements and three-dimensional finite element analyses. A simple evaluation method of cross-sectional rigidity considering non structural members and expansion joints was proposed. The actual bridge measurement revealed that stress is generated also in non-structural members when the train passing, and the non-structural members near the expansion joint have almost no stress. The proposed method can easily evaluate the cross-sectional rigidity based on the assumption of Bernoulli-Euler theory, considering the effective coefficient quantified for each non-structural member type and the reduction of the effective coefficient due to expansion joint arrangement installed on the non-structural member, which is a highly versatile method in practical design.