Prediction of Shear Failure in Concrete Structures Using Nonlinear Finite Element Analysis

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Title: Prediction of Shear Failure in Concrete Structures Using Nonlinear Finite Element Analysis

Author(s): Robert H. Iding, Boris Bresler, and Susan P. Dawson

Publication: Special Publication

Volume: 106

Issue:

Appears on pages(s): 47-74

Keywords: beams (supports); computer programs; concrete slabs; deflection; cracking (fracturing); failure mechanisms; finite element method; walls; offshore structures; reinforced concrete; structural analysis; shear strength; Structural Research

Date: 6/1/1988

Abstract:
The complex factors that influence behavior and strength of concrete components failing in shear pose serious obstacles to the use of traditional linearly elastic analysis techniques. However, recent developments in the application of nonlinear finite element methods and in modeling nonlinear material properties have allowed the development of a computer model to effectively analyze complex nonlinear situations. The model includes material laws representing the full inelastic response of concrete cracking and crushing (including effects of triaxial confinement) and the yielding of reinforcing steel bars. This computer model is verified using data from a test program involving nine reinforced concrete shear-sensitive beams of varying dimensions and span-to-depth ratios. Calculated and measured failure modes, deflection and cracking patterns, and ultimate capacities corresponded well in all of the beams compared. A computer program based on the verified model has been used by the authors in several applications to predict ultimate capacity and failure modes for complex systems of walls, beams, and slabs. One such application, the prediction of shear strength in the reinforced concrete ice walls of an offshore concrete gravity-based structure, is discussed in detail.