Chap_11_4_hw_11.pdf
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CIVL 4135 HOMEWORK SET 11 223 CIVL 4135 Anchorage and Development Length Development Length A. An 18-ft normal-weight concrete cantilever beam is subjected to a factored M u = 3,500 in-- kips and a factored shear V u = 32.0 kips at the face of the support. Design the top reinforcement and the appropriate embedment of 90 o hook into the concrete wall to sustain the external shear and mo- ment given: f y = 60 ksi; f’ c = 4,500 psi B. Design the beam reinforcement in problem A above if it was simply supported having a span l n =36 ft and subject to the same factored M u value at midspan and the shear V u at the fact of the sup- port. Evaluate the required embedment length at the support to ensure that no bond failure due to slippage can develop. Assume (a) confining beam reaction and (b) beam not monolithic with its sup- port.
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Transcript of Chap_11_4_hw_11.pdf
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CIVL 4135HOMEWORK SET 11 223
CIVL 4135 Anchorage and Development Length
Development Length
A. An 18-ft normal-weight concrete cantilever beam is subjected to a factoredMu = 3,500 in--kips and a factored shear Vu = 32.0 kips at the face of the support. Design the top reinforcement andthe appropriate embedment of 90o hook into the concrete wall to sustain the external shear and mo-ment given:
fy = 60 ksi;fc = 4,500 psi
B. Design the beam reinforcement in problemAabove if it was simply supported having a spanln =36 ft and subject to the same factoredMu value at midspan and the shearVu at the fact of the sup-port. Evaluate the required embedment length at the support to ensure that no bond failure due toslippage can develop. Assume (a) confining beam reaction and (b) beamnotmonolithicwith its sup-port.
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CIVL 4135HOMEWORK SET 11 224
CIVL 4135 Anchorage and Development Length
Bar Cutoff Problems
C. A floor system consists of single span T-beams 8 ft on centers, supported by 12 inmasonry wallsspaced at 25 ft between inside faces. The general arrangement is shown in below. A5 inchmonolith-ic slab to be used in heavy storage warehouse. Determine the reinforcement configuration and thecutoff points. Check the provisions of ACI 318 for bar cutoff.
fc = 4,000 psi (normal weight)
fy = 60,000 psi
25
1.0 1.0
8.0
Typical
5
1822
12
25--0
?
See ACI 8.7 for definitionof span length
8.0
b
8.0
D.
