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Indexed by:期刊论文

Date of Publication:2022-06-29

Journal:计算力学学报

Volume:29

Issue:2

Page Number:153

ISSN No.:1007-4708

Abstract:Moving force identification of long-span bridges is an important part of
   structural health monitoring,and as an inverse problem,it is
   ill-conditioning with uniqueness and stability problems.This paper
   deduced the discretized formulation of structure responses to moving
   force,employed the shape functions from the finite element method to fit
   the time history of moving force,and developed the moving force
   identification formulas based on load shape functions.The identification
   problem of moving force was transformed into determining the fitting
   coefficients of load shape functions,which decreased the unknown
   parameters,reduced calculation in the matrix inverse operation,removed
   or weakened the ill condition and promoted computational efficiency.To
   evaluate the proposed algorithm,a prestressed rigid-continuous concrete
   bridge was simulated by its modified finite element model,which
   subjected to moving force considering road roughness.The responses were
   analyzed by mode superposition technique,and moving force was estimated
   by load shape functions.Results show that the moving force with noise
   below 5% can be identified for complex bridges efficiently and
   accurately.

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