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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Simplification of Softened Strut-and-Tie Model for Strength Prediction of Discontinuity Regions
Author(s): Shyh-Jiann Hwang, Ren-Jie Tsai, Weng-Kin Lam, and Jack P. Moehle
Publication: Structural Journal
Appears on pages(s): 1239-1247
Keywords: compressive softening effect; diagonal compression; discontinuity region; reinforced concrete; shear; strength; strut-and-tie
Abstract:A geometric discontinuity caused by abrupt changes in cross-sectional dimensions and a force discontinuity caused by concentrated loads results in discontinuity regions due to the disturbance in the flow of internal forces. A softened strut-and-tie model has been developed for determining the shear strength of discontinuity regions that fail under diagonal compression. The softened strut-and-tie model requires complicated computations, consequently making it challenging to apply in engineering practice. In this paper, a further simplification of the softened strut-and-tie model is proposed to facilitate design practice. Strength predictions of the simplified model correlate well with 449 test results of deep beams, corbels, squat walls, and beam-column joints available from the
literature. The simplified model incorporates the shear-resisting mechanisms as postulated by the softened strut-and-tie model, and it is a function of the concrete compressive strength, steel yield strength, shear reinforcement ratio, and geometric configuration of the discontinuity region.
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