STRUCTURAL MODEL UPDATE CONSIDERING UNCERTAINTY AND RELIABILITY ASSESSMENT OF STRENGTHENING EFFECT: APPLICATION TO ADDITIONAL SUPPORTING STRENGTHENING OF A HIGH-SPEED RAILWAY BRIDGE

Abstract

 The structural model update based on actual measurement data has been recently discussed as the core technology for performance-based maintenance and quantitative evaluation of strengthening effects. In this study, the author proposes the dual sampling method combining the MCMC method and GA, for the purpose of updating the structural model and evaluating the reliability of strengthening considering the uncertainty of current performance. The proposed method was applied to the measurement data of maximum displacement for high-speed railway bridges for which additional supporting strengthening is being considered, and it was found that the dual sampling method can estimate the uncertainty of current performance, which cannot be evaluated with the MCMC method only. It was also confirmed that the uncertainty of current performance estimated by the dual sampling method significantly affects the required rigidity of additional supports within 1.5 m from existing supports.