Calculation of the live load reduction is explained in three four examples which are LiveLoadReductionToType_Example, LiveLoadMaxReduction_Example and LiveLoadReductionDLTest_Example, LiveLoadReductionTransferColumn_Example respectively.
...
Figure 1. LiveLoadReductionToType_Example
...
Column | Fx, kips - Hand Calculation | Fx, kips - Building Design Suite | ||||
|---|---|---|---|---|---|---|
Third Story | Second Story | First Story | Third Story | Second Story | First Story | |
C1 | -5 | -10 | -15 | -5 | -10 | -15 |
C2 | -5 | -9.80 | -14.20 | -5 | -9.80 | -14.20 |
C3 | -15 | -29.40 | -42.60 | -15 | -29.40 | -42.60 |
C4 | -5 | -10 | -15 | -5 | -9.80 | -14.20 |
Figure 2. LiveLoadMaxReduction_Example
...
Column | Fx, kips - Hand Calculation | Fx, kips - Building Design Suite | ||
|---|---|---|---|---|
Second Story | First Story | Second Story | First Story | |
C1 | -24.49 | -48.97 | -24.49 | -48.97 |
C2 | -24.50 | -49.01 | -24.50 | -49.01 |
C3 | -24.50 | -49.00 | -24.50 | -49.00 |
C4 | -24.51 | -49.02 | -24.51 | -49.02 |
Figure 3. LiveLoadReductionDLTest_Example
...
Column | Fx, kips - Hand Calculation | Fx, kips - Building Design Suite | |||||
|---|---|---|---|---|---|---|---|
Third Story | Second Story | First Story | Third Story | Second Story | First Story | ||
C1 LL | -9.60 | -21.1 | -32.5 | -9.60 | -17.30 | -26.06 | |
C1 HLL | -15 | -4345.8 | -71 | -15 | -43 | - | 45.8-73.8 |
...
73.8 |
Figure 4. LiveLoadReductionTransferColumn_Example
Dimensions : 20ft x 20ft in plan
In this example, column’s tributary area not continuing bottom floors transfers other column’s tributary area.
Live Load Class
Live Load Type | Magnitude, psf |
|---|---|
Live Load | 75 |
Reducible Area / Supported Floors
Columns/Reducible Area | Second Story, inch^2 | First Story, inch^2 |
|---|---|---|
C1 | 8640 | 23040 |
C2 | 8640 | 23040 |
C3 | 8640 | 23040 |
C4 | 8640 | 23040 |
C5 | 11520 | 11520 |
C6 | 11520 | 11520 |
Supported Floors | 1 | 2 |
Live Load
Column | Fx, kips - Hand Calculation | Fx, kips - Building Design Suite | ||
|---|---|---|---|---|
Second Story | First Story | Second Story | First Story | |
C1 | -4.5 | -15 | -4.5 | -15 |
C2 | -4.5 | -15 | -4.5 | -15 |
C3 | -4.5 | -15 | -4.5 | -15 |
C4 | -4.5 | -15 | -4.5 | -15 |
C5 | -6 | 0 | -6 | 0 |
C6 | -6 | 0 | -6 | 0 |
Verification object link