Abstract
The paper deals with a preparation of a complex FEM model for a local damage detection. The initial verified and validated three-dimensional FEM model of a steel truss bridge in laboratory is revised step-by-step to achieve the accurate model according to the experimental model. The emphasis is on modelling of the joints with 4 rivets and modelling of correct boundary conditions, as well as mass parameters and cross-section dimensions.A modal analysis of the structure is performed in FEM software. Many experimental measurements were made to correctly revise the FEM model. The calculated natural frequencies are compared with the measured ones. In addition, mode-shapes from the calculation are validated with the measured mode-shapes. The difference between the prepared FEM model and the measured specimen is small enough after a few steps of tuning. The verified, validated and revised numerical model can be used in future for a local damage detection.
Highlights
Civil infrastructure like bridge structures deteriorate with time due to various reasons
According to the 2017 Infrastructure Report Card [1] produced by the American Society of Civil Engineers (ASCE) almost 4 in 10 bridges are over 50 years and older
The structural health monitoring (SHM) of bridge structures can help to prevent from the stated situations
Summary
Civil infrastructure like bridge structures deteriorate with time due to various reasons. Many of these structures worldwide are currently nearing the end of their proposed design life. This situation can result into a necessity of major rehabilitation. According to the 2017 Infrastructure Report Card [1] produced by the American Society of Civil Engineers (ASCE) almost 4 in 10 bridges are over 50 years and older. This means that bridge structures in the USA are 43 years old on average. This paper deals with one of the first parts of SHM (preparation of a FEM model of bridge specimen)
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