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column mechanical splice coupler?

column mechanical splice coupler?

column mechanical splice coupler?

(OP)

How much maximum percentage of steel do you use in columns? It is said when it goes above 3%. One must use mechanical splice coupler.. any experience with this? Have you designed percentage of column steel that goes 4% and just using ordinary splicing at mid point of column?

RE: column mechanical splice coupler?

As per 10.9.1 of ACI 318-05 (which I have of this time), percentage of steel is from 1% to 8%. At R10.9.1 it says "The percentage of reinforcement in columns should usually not exceed 4 percent if the column bars are required to be lapped splice." Thus, if you will have a 100% lap splice you will have a maximum reinforcement of 8%. But if you will exceed this requirement, then you will need mechanical splices.

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