Damage assessment in concrete marine structures using damage plasticity model

Marine concrete structure undergoes early cracking and deterioration due to extensive corrosion. The present study applies numerical modeling using damage plasticity constitutive model to simulate damage characteristics of concrete. Scaled model of a beam on a jetty platform is developed using 3D solid elements for concrete and 2D shell embedded elements for rebar. Four-point load test is simulated to validate responses against beams with comparable dimensions and material properties. Damage parameters namely natural frequency, mode shape, MAC, MSF and MSE based indices are numerically examined for effectiveness in detecting and quantifying damages in concrete beams on marine structures. Damage modeling in present study possesses significant improvement in comparison to the other conventional methods. Damage parameters are assessed for increasing levels of cracking. Presented study has a direct application to understand the sensitivity and reliability of various damage parameters for detecting and locating damages in heterogeneous materials like reinforced cement concrete.