This paper presents the embedding of calibrated fiber optic cables into a simplified concrete structure to obtain spatially dense internal strain measurements under a 3-point bending load. Taking advantage of the millimeter-level spatial resolution of the measurement system, it is possible to identify the onset of cracking within the concrete and compare the behavior of both unreinforced and steel rebar-reinforced structures. Integrating these sensors during new construction, or retrofitting into existing structures, will enable the rapid and cost-efficient inspection and lifetime monitoring, identifying impending failure before a catastrophic event occurs. This is exemplified by two applications in France: instrumenting a tower’s foundation and measuring settlement of a pillar built using a new design.
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