There are three candidate cross sections for a beam that is to span a 20 ft space. The loading is given below. The load P can move along the beam so you must account for the maximum possible moment and the maximum possible shear (the load may not be in the same position for these two maximums). The beams are made of wood planks, each 1x12". They are nailed together with 3" long nails. Each nail has a 100 lb shear capacity. The wood has a maximum tensile/compression design strength of 1000 psi and a maximum design shear strength of 75 psi. Do not use safety factors. NEGLEC T BEAM WEIGHT.

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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There are three candidate cross sections for a beam that is to span a 20 ft space. The loading is given
below. The load P can move along the beam so you must account for the maximum possible moment
and the maximum possible shear (the load may not be in the same position for these two maximums).
The beams are made of wood planks, each 1x12". They are nailed together with 3" long nails.
Each nail has a 100 lb shear capacity.
The wood has a maximum tensile/compression design strength of 1000 psi and a maximum design shear
strength of 75 psi. Do not use safety factors.
NEGLECT BEAM WEIGHT.
Part of the analysis is to determine how many nails are required. If I give you 500 nails, is this enough?
Will any of these configurations work.. and why. And if none of them work, suggest an alternative to
one of these that will work... and prove it.
Transcribed Image Text:There are three candidate cross sections for a beam that is to span a 20 ft space. The loading is given below. The load P can move along the beam so you must account for the maximum possible moment and the maximum possible shear (the load may not be in the same position for these two maximums). The beams are made of wood planks, each 1x12". They are nailed together with 3" long nails. Each nail has a 100 lb shear capacity. The wood has a maximum tensile/compression design strength of 1000 psi and a maximum design shear strength of 75 psi. Do not use safety factors. NEGLECT BEAM WEIGHT. Part of the analysis is to determine how many nails are required. If I give you 500 nails, is this enough? Will any of these configurations work.. and why. And if none of them work, suggest an alternative to one of these that will work... and prove it.
1
2
3
1"
12"
LNails
All wood pieces
12"
are 1x12
P=3500 Ibs
L=20 ft
第T
Transcribed Image Text:1 2 3 1" 12" LNails All wood pieces 12" are 1x12 P=3500 Ibs L=20 ft 第T
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