Effects of Material Inelasticity on the Design and Performance of Reinforced Concrete Link Beams Subjected to Gravity Loading
Abstract: For the
determination of sectional design forces in concrete structures, it is nearly always
assumed that structural concrete is a linear elastic material. However, structural
concrete is highly inelastic, in which the stiffness may be only a small fraction of the
uncracked elastic stiffness. Codes-of-Practice provide largely empirical provisions that
focus on ensuring that structur... read moreal members have adequate strength, and provide little
guidance to determine the performance of the structure under service loadings or
overloads. Recent advancements in reinforced concrete nonlinear models and high-speed
computing power provide the design engineer with the necessary tools to make a more
realistic, performance-based, and optimum design. In this thesis, a case study is made
of the design of six link beams of a high-rise structure that is subjected to gravity
loading. An iterative design procedure is proposed and developed using VecTor2 (Vecchio
et al. 2013), a specialized nonlinear finite element analysis software. VecTor2 employs
constitutive relationships from various nonlinear models, including the Modified
Compression Field Theory (Vecchio and Collins 1986), which defines the response of a
two-dimensional continuum structure undergoing membrane action. In order to explore and
validate the degree of nonlinearity in the response, a single link beam model is
constructed using VecTor2 as well. The response of the single link beam model is then
used to inform the iterative design
Thesis (M.S.)--Tufts University, 2017.
Submitted to the Dept. of Civil Engineering.
Advisor: Daniel Kuchma.
Committee: Masoud Sanayei, and Po-Shang Chen.
Keywords: Civil engineering, Mechanics, and Engineering.read less