Strut and Tie Models for Strength and Deformation of RC Members


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Title: Strut and Tie Models for Strength and Deformation of RC Members

Author(s): S. G. Hong and S. G. Lee

Publication: Special Publication

Volume: 209


Appears on pages(s): 513-530

Keywords: deformation analysis; limited ductility; RC column; strut and tie model

Date: 9/26/2002

This paper presents strut and tie models that can be used to determine strength and deformation limits for RC members. Conventional strut and tie models have been used for strength design, but they cannot appropriately address the ductility of members that is important to insure safety under severe cyclic loads. This proposed strut and tie model is constituted to address the end region of flexural members, including plastic hinge regions, and will be the basis for the calculation of deformation and corresponding shear strength as well. The behavior of each component of the strut and tie model is evaluated based on the material properties and stress paths. The elongation of the tie element depending on crack spacing and width is obtained from the bond-slip relationship. The contraction of strut element is simply determined from the properties of concrete. The member deformation is obtained by combining the truss deformation determined from components behaviors with joint rotation, The strut and tie model in this paper will provide useful tools for both the design and evaluation of ductility-required RC members.