A tension lap splice is classified as Class B on the approved reinforcing schedule. How is the required lap length taken from ACI relative to the tension development length ld?
Correct Answer
C) 1.3 ld
ACI 318 tension lap-splice provisions use 1.3 ld for a Class B tension lap splice. Other choices: 0.75 ld is not a tension lap splice class, 1.0 ld describes the shorter Class A basis, and 2.0 ld is an overstatement for this classification.
Why This Is the Correct Answer
ACI 318 tension lap-splice provisions use 1.3 ld for a Class B tension lap splice.
Why the Other Options Are Wrong
Option A: 0.75 ld
The trap in A is 0.75 ld. That selection is wrong because 0.75 ld is a different published number than the cited Lap splices value; ACI 318-19 25.5 tension lap splices supports 1.3 ld; Class B tension lap splice length is 1.3 ld.
Option B: 1.0 ld
Choice B gives 1.0 ld. Its specific error: 1.0 ld is a different published number than the cited Lap splices value; ACI 318-19 25.5 tension lap splices supports 1.3 ld. The accepted answer is 1.3 ld.
Option D: 2.0 ld
In concrete work, 2.0 ld is the wrong selection for Lap splices: 2.0 ld is a different published number than the cited Lap splices value; ACI 318-19 25.5 tension lap splices supports 1.3 ld.
Memory Technique
File lap splices under a warning sign: condition first, number or duty second, answer 1.3 ld.
Reference Hint
Open ACI 318-19, Building Code Requirements for Structural Concrete; use ACI 318-19 25.5 tension lap splices to confirm that ACI 318 tension lap-splice provisions use 1.3 ld for a Class B tension lap splice.
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