ANCHORAGE, AND DEVELOPMENT
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1. Consider the cantilever beam extending from the column indicated and supporting the
concentrated load shown. Calculate the required development length ??? of the top
reinforcements. Use equation 6.5 in the textbook (186p). Also discuss if the calculated
development can be accommodated inside the 20¸20 column.
3 ???? ???? ???? ???? ????
)??
??? = (
40 ???????? (???? + ?????? ) ??
????
Given conditions:
Normal weight concrete, ???? = 60??, ????? = 5??
Uncoated bars used (no hook, no heads)
Beam
Three No. 8
bars
20¸20column
No. 3 Stirrups
with spacing
of 8 in.
2. Recalculate the development length of the reinforcements obtained in Problem 1 assuming
hooked bars are used. Use Equation 6.10. ????? required for the calculation of ???? can be taken as
0.8 in2 assuming the use of four No. 4 ties confining the headed bars.
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