Simulating failure behavior of reinforced concrete T-beam under impact loading by using peridynamics

Abstract

Peridynamics has been proven to be a promising method for investigating the damage and failure behaviors of reinforced concrete structures due to its strong capacity in tackling discontinuous problems. To accurately describe the dynamic failure behavior and damage evolution of reinforced concrete structures under impact loading, the commonly used micropolar peridynamic model is improved. The improved micropolar peridynamic model considers the weak tensile strength and strong compressive strength of concrete materials, weakens the interactions between rebar and concrete in reinforced concrete structures, and optimizes the descending softening branch of the concrete constitutive model after tensile yielding. The present approach is demonstrated through a single bar pull-out test and a four-point-bending reinforced concrete beam test. Besides, by introducing the contact algorithm for rigid projectile impact and penetration to deformable targets, the peridynamic model and numerical solver are applied to simulate the failure behavior of the reinforced concrete T-beam under drop hammer impact. The peridynamic predictions agree well with available experimental observations, demonstrating the reliability and potentiality of the improved micropolar peridynamic model.