Reducing Discrepancy between Deep Beam and Sectional Shear-Strength Predictions

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Title: Reducing Discrepancy between Deep Beam and Sectional Shear-Strength Predictions

Author(s): Robin G. Tuchscherer, David B. Birrcher, and Oguzhan Bayrak

Publication: Structural Journal

Volume: 113

Issue: 1

Appears on pages(s): 3-15

Keywords: deep beam; sectional shear; shear span-depth ratio; strut-and-tie model (STM); transition

Date: 1/1/2016

Abstract:
The objective of this study is to reduce the discrepancy between strut-and-tie modeling and sectional shear strength predictions at an a/d near 2. To accomplish this objective, the authors compiled and analyzed a database of 905 deep beam shear tests; 868 were gathered from the past literature and 37 were tested by the authors as part of a recent experimental investigation. Based on the results of the investigation and an analysis of the database, the authors identify the contributing causes of the discrepancy and recommend improvements to current shear provisions. The strut-and-tie model (STM) procedure proposed by the authors in a separate paper provides a uniform level of conservatism at the transition region between deep beam and ACI 318-11 sectional shear provisions.