Analysis of beam deflection under the effect of concentrated load us with little information about the structure, but this problem is very common in the testing, load testing needs. In fact the stiffness of the structure on each piece are not the same (with a simple beam that is affected by horizontal beams, with the continuous beam that is the effect of strengthening the position and the potential damage to bridge…). Therefore, the study of a simple beam deflection hardness change is a prerequisite for any studies determining parameter changes the stiffness of the beam as well as a study to identify the damaged girder segment. This paper focuses on analyzing the response of the beam still under the effect of concentrated load beam to the case of several sections of different hardness.
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