Title: General Analytical Model for Nominal Shear Stress of Type 2 Normal- and High-Strength Concrete Beam-Column Joints

Author(s): Sayed A. Attaalla

Publication: Structural Journal

Volume: 101

Issue: 1

Appears on pages(s): 65-75

Keywords: beam-column; joint; reinforced concrete; reinforcement; seismic; shear stress

DOI: 10.14359/12999

Date: 1/1/2004

Abstract:
This paper presents an analytical expression developed to estimate the seismic shear strength of joint cores in reinforced concrete beam-column connections. The model assumes uniform stresses and strains inside the joint and considers the compression-softening phenomenon associated with cracked reinforced concrete in compression. It addresses major factors deemed to be effective on the joint behavior including the joint geometry and the existence of transverse beams. The predictions of the model are verified using experimental measurements of 130 tests conducted in different countries and cover a wide range of parameters affecting the joint behavior. The model is found to adequately predict the nominal shear stress of the joint and give better correlation with test results than the current ACI 318 and New Zealand codes. The proposed expression is suitable for routine design of joints cast from normal- and high-strength concrete. The suggested model indicates that the joint shear strength depends primarily on the concrete compressive strength fc¢ and emphasizes the role of confining the joint core.