Title page for ETD etd-05092012-122937

Type of Document Master's Thesis
Author Cojocaru, Razvan
Author's Email Address cojocaru@vt.edu
URN etd-05092012-122937
Title Lifting Analysis of Precast Prestressed Concrete Beams
Degree Master of Science
Department Civil Engineering
Advisory Committee
Advisor Name Title
Moen, Cristopher D. Committee Chair
Roberts-Wollmann, Carin L. Committee Member
Wright, William J. Committee Member
  • lifting support eccentricity
  • sweep
  • lateral stability
  • precast prestressed concrete
Date of Defense 2012-04-27
Availability unrestricted
Motivated by Robert Mast’s original papers on lifting stability, this research study provides a method for predicting beam behavior during lifting, with application in the construction of bridges. A beam lifting cracking limit state is developed based on analytical equations for calculating the roll angle of the beam, the internal forces and moments, the weak-axis and strong-axis deflections, and the cross-sectional angle of twist. Finite element simulations are performed to investigate the behavior of concrete beams during lifting and to validate the proposed method. Additionally, a statistical characterization of beam imperfections is presented, based on recently conducted field measurements of beam lateral sweep and eccentricity of lift supports. Finally, numerical examples for two typical precast prestressed concrete beam cross-sections are included to demonstrate the proposed method.
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