Numerical simulation of failure process of high-strength concrete using the discrete-element model

A two-dimensional mesoscopic model is presented for simulation of the failure process of high strength concrete confined by fiber-reinforced polymer (FRP). This model is based on the Discrete Element Method (DEM) and modified Rigid Body Spring Model (RBSM), which was developed for simulation of the behavior of normal concrete, is extended herein to propose a high strength concrete model. Due to the fact that the mortar matrix and interfacial layer in high strength concrete are generally stronger than the strength of the aggregate, springs are designed in such a way that the crack can penetrate into the aggregate. To develop the confined model, FRP elements are connected to the basic model as rectangular elements, the connections of which are modeled together based on Hooke's law in cylindrical coordinates. Interfacial springs between FRP and concrete elements are designed based on the bond-slip model and the behavior of concrete core under confining action provided by the FRP jacket. The Failure behavior ...