Is it permissible to splice 7-wire strands without prestress by lapping?

[user277418]

Hello

I have a 7-wire strand that should be spliced. It will not be prestressed. Is it permissible to use a lap splice (like for rebars) in this case or couplers/splice chucks should be used?
I could not find any information in codes about the topic.

Best regards

 

[Ron]

To my knowledge, there are no lap splicing criteria for strands. They are not deformed like rebar but still achieve bond, though the lap splice length would be the question. I doubt you would use the same splice lengths.

 

[robyengIT]

strand or wire ??
for HTS wire usual practice is shown in attached figures

 

[user277418]

strand or wire ??

A good point. It is actually a 7-wire strand. Corrected it in the topic.

 

[robyengIT]

two remarks :
1 - since strand is not rigid like a rebar, in compressed zone the structure is not reinforced
2 - since is not stressed (pre or post) what about straightness ? (i.e. before going in tension it has to become straight)

 

[user277418]

two remarks :
1 - since strand is not rigid like a rebar, in compressed zone the structure is not reinforced
2 - since is not stressed (pre or post) what about straightness ? (i.e. before going in tension it has to become straight)

The strand used as a transverse reinforcement in a wire loop connection and as a peripheral tie in a precast structure. The chose was made because of tight conditions of the construction (not enough space to use 12m rebars and big diameters). Maybe this will clear it up a little.

 

[TXStructural]

The limits on bend diameter are not just about the bending of the bar. One primary mode of failure in tight bends is crushing of the concrete inside the bend when force is applied.
I also doubt that 7-wire can be bent tighter than a 10 mm or 12 mm rebar without compromise.

 

[user277418]

I also doubt that 7-wire can be bent tighter than a 10 mm or 12 mm rebar without compromise.

It should be fine. The bending radius would be around 175 mm.