A novel efficient peridynamic modeling approach for fine simulation of UHPC with fibers

UHPC with fibers is widely used in civil structures due to its superior strength, while traditional numerical simulations are hard to describe the complex mechanical behaviors efficiently and accurately between fibers and matrix. In this paper, a novel efficient modeling approach is presented to accurately simulate the effect of fiber on the matrix in UHPC based on bond-based peridynamics (BPD). An efficient coupled model is developed to study the interaction between the concrete matrix and fibers. The modeling framework has been implemented by extending an open source earthquake engineering simulation framework, OpenSees, to enable efficient implicit/explicit analysis of the nonlinear behaviors of UHPC using a parallel computing strategy. Three examples are used to verify the proposed modeling approach. The results demonstrate that the approach has important practical significance in simulating the nonlinear characteristics of UHPC components, especially in describing the complicated fiber-concrete interaction behaviors in the crack propagation process. Based on the analyses, the effects of fibers on UHPC are studied in detail, e.g., improvements in strength and ductility, changes in crack width and failure patterns of UHPC components. The proposed modeling approach offers an efficient analysis tool to investigate the complex nonlinear behavior of UHPC components.