Variables:
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Joist Designation
(Size) =
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Joist Span, L
=
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ft.
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Joist Spacing, S =
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ft.
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Unif. Dead Load,
w(DL) =
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psf
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Unif. Live Load,
w(LL) =
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psf
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Deflect. Factor,
DF(LL) =
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Results:
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Required Loads:
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Dead Load, W(DL) =
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plf
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W(DL) = w(DL)*S
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Live Load, W(LL) =
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plf
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W(LL) = w(LL)*S
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Total Load, W(TL)
=
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plf
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W(TL) = W(DL)+W(LL)
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Reactions, RL
& RR =
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lbs.
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RL = RR = W(TL)*L/2
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For Joist Selected
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Joist
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Allowable Loads and Stress
Ratios
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Size
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Weight
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Inertia, Ix
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of
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(plf)
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(in.4)
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(plf)
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Ratio
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(plf)
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Ratio
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Bridging
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Total
Load Deflect.
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Live Load Deflect.
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D(TL)
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D(LL)
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D(TL) =
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1.15*5*W(TL)*(L-0.33)4*(123)/(384*29000000*Ix)
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(in.)
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(in.)
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D(LL)=
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1.15*5*W(LL)*(L-0.33)4*(123)/(384*29000000*Ix)
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Determine Equivalent
Unif. Dead and Live Loads for Input from Detailed Analysis:
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Equiv. Load, W(TL) =
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plf
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w(TL)
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Equiv. Load, w(TL) =
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psf
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w(TL) = W(TL)/S
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Load Ratio, DL/TL =
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DL/TL = W(DL)/W(TL)
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Unif. Dead Load, w(DL) =
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psf
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w(DL) =
w(TL)*(DL/TL)
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Unif. Live Load, w(LL) =
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psf
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w(LL) = w(TL)-w(DL)
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