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Fracture Simulation of UHPFRC Girder with the Interface Type Model  

Guo, Yi-Hong (금오공과대학교 토목환경공학부 토목공학과)
Han, Sang-Mook (금오공과대학교 토목환경공학부)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.23, no.1, 2010 , pp. 81-94 More about this Journal
Abstract
This paper deals with the fracture simulation of UHPFRC girder with the interface type model. Based on the existing numerical simulation of quasi-brittle fracture in normal strength concrete, constitutive modeling for UHPFRC I-girder has been improved by including a tensile hardening at the failure surface. The finite element formulation is based on a triangular unit, constructed from constant strain triangles, with nodes along its sides and neither at the vertex nor the center of the unit. Fracture is simulated through a hardening/softening fracture constitutive law in tension, a softening fracture constitutive law in shear as well as in compression at the boundary nodes, with the material within the triangular unit remaining linear elastic. LCP is used to formulate the path-dependent hardening-softening behavior in non-holonomic rate form and a mathematical programming algorithm is employed to solve the LCP. The piece-wise linear inelastic yielding-failure/failure surface is modeled with two compressive caps, two Mohr-Coulomb failure surfaces, a tensile yielding surface and a tensile failure surface. The comparison between test results and numerical results indicates this method effectively simulates the deformation and failure of specimen.
Keywords
tensile hardening; UHPFRC; fracture simulation; LCP;
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Times Cited By KSCI : 2  (Citation Analysis)
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