Civil Engineering ETDs

Publication Date

10-16-2014

Abstract

The main goal of the thesis is to develop a constitutive damage model for simulating tensile fracture of concrete using the micropolar peridynamics model. Micropolar peridynamics was proposed by Gerstle in 2007 as a generalization to the bond based peridynamics method introduced by Silling in 2000, which was only capable of handling materials with specific Poissons ratios. Inspired by the bilinear cohesive model in the cohesive crack approach, a new constitutive damage model is proposed to simulate the tensile fracture of a normal-strength concrete. Laboratory experimental data for crack mouth opening displacement vs. load of notched beams, obtained by Chapman in 2011 which are of three different sizes, are used to calibrate the model. It is shown that the simulation results obtained from modeling match very well with those from laboratory experiments, and the size of the fracture process zone, the damage, and cracking patterns are match experiment as well. As a part of the research the isotropicity of the hexagonal particle lattice , proposed by Gerstle in 2011 and used in our simulations, is shown analytically, and the critical time step of the explicit time integration method, which is used to solve the governing equations, is determined.'

Keywords

Peridynamics, Concrete, Fracture

Document Type

Thesis

Language

English

Degree Name

Civil Engineering

Level of Degree

Masters

Department Name

Civil Engineering

First Committee Member (Chair)

Ross, Timothy Jr

Second Committee Member

Arup, Maji Jr

Third Committee Member

Gerstle, Walter Jr

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