FIXED ANGLE SOFTENED TRUSS MODEL FOR REINFORCED CONCRETE

A softened truss model was previously developed for reinforced and prestressed concrete membrane elements subjected to in-plane shear and normal stresses. The existing model satisfies the three principles of mechanics of materials: two-dimensional stress equilibrium, Mohr's circular strain compatibility, and the softened biaxial constitutive laws of concrete. That is, the model can predict the strength of a membrane element as well as its load-deformation history. However, this model cannot predict the "contribution of concrete" observed in tests, because it is based on the assumption that the direction of the cracks is inclined at the rotating angle following the postcracking principal stresses of the concrete. This paper presents a new and more general softened truss model in which the direction of the cracks is assumed to incline at the fixed angle following the principal stresses of the applied loading. This new model, although more complex, is capable of predicting the "contribution of concrete." The fixed angle softened truss model requires four constitutive laws of materials. Three have been established previously for the rotating angle softened truss model. This paper presents the fourth constitutive law relating the average shear stress of concrete to the average shear strain.

  • Availability:
  • Supplemental Notes:
    • This paper is the seventh in a series of papers dealing with the development of a unified theory for reinforced concrete sponsored by the National Science Foundation and conducted at the University of Houston.
  • Corporate Authors:

    American Concrete Institute

    P.O. Box 19150, Redford Station, 22400 Seven Mile Road
    Detroit, MI  United States  48219
  • Authors:
    • Pang, X-B
    • Hsu, TTC
  • Publication Date: 1996-3

Language

  • English

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Filing Info

  • Accession Number: 00720440
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 24 1996 12:00AM