Bundling Rebar

[PDubb]

Good Morning All,

I have a question about bundling rebar. In general, most designs that have bundled rebar have equal size bars in the bundle, but is it a problem to bundle two different sizes of rebar?

It would be ideal for me to place a 35M bar with a 20M bar in one bundle. Can this be done well in the field? Will I lose any capacity? Is it not considered good practice to do this?

For background: This rebar bundle would be placed in a railway bridge abutment and embedded into the rock. The abutment is to be built in Ontario, Canada.

 

[dewood1234]

ACI 318 section 12.4 states that develpoment length for compression and tension for three bars bundles shall be increased 20%; four bar bundles 33%. there are other things to consider that section 7.6.6 talks about, one being staggering of the bundle terminations.

 

[msquared48]

You can bundle unequal bar sizes, no prob.

Mike McCann
MMC Engineering