Rebar Development Length with Factors
Easydevelopment-lengthmodifiers
For this exercise, required straight-bar development length is defined by the supplied model ld = lbase·ψt·ψe, with lbase = 350 mm, top-bar factor ψt = 1.3, and coating factor ψe = 1.2. All other factors are 1.0 and no cap or minimum applies. What is ld under this model?
- A875 mm
- B546 mm
- C525 mm
- D455 mm
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Answer: B. 546 mm
Equation: ld = lbase ψt ψe (factors multiply). Substitution: 350(1.3)(1.2) = 350(1.56) = 546 mm. Wrong: 875 mm multiplies 350 by the sum of the factors (1.3 + 1.2 = 2.5); 525 mm adds the increments (350(1 + 0.3 + 0.2)); 455 mm applies only ψt and omits ψe.
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