Title: Hot Topic Session II: New One-Way Shear Equations for the 318 Building Code, Is it Time? (Part 1)

Author(s): Sanders, Belarbi, Kuchma, Cladera

Publication: Web Session

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Date: 3/31/2016

Abstract:
The basic one-way shear equations in the ACI 318 Building Code have not changed since 1971, while other codes in the world have made changes. The current code consists of over 17 different equations. There have been advances in the understanding of size effect, members without transverse reinforcement, and members with the light longitudinal reinforcement. Members of Joint ACI-ASCE committees 445 and 446, and ACI Subcommitte 318-A devoted a great effort in the last two decades to investigate the effectiveness and safety of the current 318 one-way shear design equations. Immediately after the 318-14 Code cycle, the above committees challenged the researcher and practitioner community to present proposals for new one-way shear design methods that are safer and more effective for possible incorporation into the 318-19 code cycle. To date, six proposals have been submitted. These proposals were first evaluated against the existing 445 experimental shear database and then implemented in a comprehensive design example database that includes slabs, beams, and columns with prestress and non-prestress. This session will present the result summary of these evaluations and give a chance to each proposal’s author to describe the advantages of their method over the current 318-14 equations. The discussions held at this Hot Topic Session will be used by 318-E and 318 as input into their deliberations on the next step for one-way shear design for the 318-19 Building Code. This will be followed with a period of Q/A and attendees’ input and feedback on the new approaches.