Abstract
Discussion on “Minimum vertical reinforcement in RC walls: Theoretical requirements for low and high ductility demands”
Highlights
I enjoyed reading this article in the Bulletin, along with earlier publications by the authors on the same research topic
Referring the article, and to the discussion of Equation 12 on Page 476, the likely material strengths in walls is stated as considering the following factor: “1.2 multiplier on f ′c to represent the average target compressive strength given in NZS 3104:2003 relative to the specified strength (5th percentile)”
In NZ construction practise the 1.2 multiplier is often not always appropriate, as eluded to below: 1. The 1.2 multiplier relates to the target compressive strength which concrete producers are required to achieve as a minimum above that which is specified by engineers
Summary
Dear Sir, Re: “Minimum vertical reinforcement in RC walls: Theoretical requirements for low and high ductility demands”, by Yiqiu Lu and Richard S. The 1.2 multiplier relates to the target compressive strength which concrete producers are required to achieve as a minimum above that which is specified by engineers. The article does not refer to SCC, which is being used more popular in NZ construction. Both points 1 and 2 above are important, the main purpose of this letter is to provide further discussion on point 2. In context of the article, this scenario has no issues with the minimum longitudinal reinforcement required by concrete design codes. This is not the only scenario where SCC is being used in NZ construction.
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