Material Behavior Characteristics for Reinforced Concrete Shells Stressed Beyond the Elastic Range

摘要

Equations are developed to simulate the actual behavior of reinforced concrete and, in particular, to take into account effects due to cracking and plastic deformations. Biaxial state of stress is considered for a material composed of concrete and steel bars. Steel is assumed to have elastic perfectly plastic properties. For the concrete a cracking criterion based on the octahedral shearing stress theory is employed and in biaxial compression a similar yield criterion is chosen. The composite concrete-steel material has anisotropic propertied due to the presence of the steel bars, especially, after the formation of cracks. The stress-strain relations will subsequently be used in finite element or lumped parameter analyses of reinforced concrete plates and shells. At this stage it is convenient to choose a sandwich or layered system to model the actual plate or shell. Each layer of the system is assumed to be in a state of plane stress. The numerical results are compared to available experimental data. (Author)