Numerical study of reinforced concrete slabs under extreme loading conditions: Impact and fire

摘要

In the present paper,the influence of thermally induced damage of reinforced concrete(RC)slabs on their impact properties are numerically investigated.The RC slabs are first pre-damaged through fire load and then loaded by the impact of hammer.Transient 3D finite element(FE)thermo-mechanical analysis is performed.Subsequently,impact simulation is conducted based on the explicit multi-body dynamic analysis and contact algorithm with adaptive element deletion technique.As a constitutive law for concrete rate and temperature,dependent microplane model is employed.The co-rotational Cauchy stress tensor and Green-Lagrange strain tensor are used in the framework of total Lagrange FE formulation.The numerical results are discussed and compared with those obtained experimentally.It is shown that pre-damage of RC slab through fire reduces the impact resistance of the slabs,and that the simulation is able to realistically replicate the experimental tests.