Retrofitting and better performance:
Reducing Structural weight, and thus, lateral force of gravity, results in increasing the structure’s resistance against the quakes
this system reduces human errors significantly
More appropriate vibration of concrete will be provided due to reduction of unnecessary volume of rebar in joining zones
Involvement of concrete with rebar is increased due to Decrease of unnecessary additional volume of rebar
Resistance at the joining zone will be higher than other points through the rebar due to an increase in cross section area
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Technical Notes
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Overlap
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Coupler
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Forging
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Technical quality & reactions in joining zone
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Poor
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Good
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Excellent
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Time of build & implementation
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More
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Less
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least
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Possible Defects in joining zone
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More
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Less
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least
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Alignment
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None
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Good
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Excellent
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Over weight in joining zone
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Equal to Overlap Weight
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Equal to a coupler
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None
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Using Creator Diameters
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Impossible
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Possible
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Possible
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Weight of used steel
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Equal to Overlap
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None
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None
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Cross section of the beam in joining zone
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Increases
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The least
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The least
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Joining length
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80 to 200 cm
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Approximately 10 cm
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Maximum 3 cm
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Rebar wastes
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High
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None
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None
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Hired factor of joining
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Steel Wire
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Coupling & by thread
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Oxygen Acetylene
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Elimination of high density of rebars
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Unavoidable
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Good
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The best
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Movement of the sands through the joining zone
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Hardly
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Easily
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More easily
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Cost
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Very high
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High
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affordable
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