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| Moving force identification based on load shape function for a long-span bridge structure |
| Received:December 25, 2011 Revised:February 10, 2012 |
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| DOI：10.7511/jslx201202001 |
| KeyWord:structural health monitoring moving force identification shape function impulse response long-span bridge structure |
| Author | Institution |
| 王蕾 |
哈尔滨工业大学 土木工程学院, 哈尔滨 |
| 侯吉林 |
大连理工大学 土木工程学院, 大连 |
| 欧进萍 |
哈尔滨工业大学 土木工程学院, 哈尔滨 ; 大连理工大学 土木工程学院, 大连 |
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| 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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