Intrinsic Damage Assessment of Beam Structures Based On Structural Damage Indicators

摘要

One of the main challenges of current Structural Health Monitoring (SHM) systems is the trade-off between system complexity and system sensitivity. This contribution proposes to use structural analysis for an increase in sensitivity and efficiency. Comparing the structural behavior of the undamaged and damaged structure, optimized Structural Damage Indicators (SDI) are derived. Due to their zero-baseline, they enable an efficient monitoring based on a True or False statement. Structural models are used as digital baseline for an intrinsic damage assessment. This approach is shown in detail for beam structures, which are widespread in all fields engineering. In case of a bending dominated load case, strain at the neutral axis is proposed as SDI. For longitudinal forces, a zero-strain direction is derived as a purely material dependent parameter. Here, strain in zero-strain direction is used as SDI. The combination of both SDIs enables an efficient SHM for arbitrary loaded beam structures.