RAM Concept stores only a limited number of slab analysis values. For example, standard, maximum and minimum Mx, My and Mxy values are stored, while moment values about other axes (not x- or y- axis) are calculated via Mohr’s Circle calculations. Similarly, standard, maximum and minimum Px, Py, Vxy, Mx, My and Mxy values are used to calculate stress values at the top, center and bottom of the slab.
Because minimum and maximum values are not stored for these derived values, the calculation of the minimum and maximum values is approximate.
Example: if one loading pattern gives an x-deflection of 10 and a y-deflection of 0, while another pattern gives a x-deflection of 0 and a y-deflection of 10, the Max context deflection will be reported as 14.4, even though the true maximum deflections never exceeded 10.
The following slab maximum and minimum context plot values should always be considered approximate:
- Values for any axis that is not the x- or y- axis.
- Stress values for any depth that is not mid-depth.
- Lateral deflection values for any depth that is not mid-depth.
- Lateral deflection values where the center of the slab is not at elevation zero.
Table 1. Calculation of Standard, Max and Min values
|
Layer Type
|
Standard |
Max |
Min |
| Loading |
Values with full applied loads (no pattern loading) |
Maximum values that occur considering each pattern loading (complete with pattern factors) and the full loading.
|
Minimum values that occur considering each pattern loading (complete with pattern factors) and the full loading. |
|
Single
Load Combination
|
Linear combination of Loading Standard values using the Standard load factors |
Values that occur when combining all loadings, taking the maximum value of the following four values for each loading:
- Standard Load Factor * Max
- Alt Load Factor * Max
- Standard Load Factor * Min
- Alt Load Factor * Min
|
Values that occur when combining all loadings, taking the minimum value of the following four values for each loading:
- Standard Load Factor * Max
- Alt Load Factor * Max
- Standard Load Factor * Min
- Alt Load Factor * Min
|
|
Lateral Group
Load Combination
|
(not available) |
Values that occur when combining all gravity loadings, taking the maximum value of the following four values for each loading:
- Std Load Factor * Max
- Alt Load Factor * Max
- Std Load Factor * Min
- Alt Load Factor * Min
Plus the maximum single value of all of the lateral loadings' (of the correct type) values:
- Std Lateral Load Factor * Max
- Alt Lateral Load Factor * Max
- Std Lateral Load Factor * Min
- Alt Lateral Load Factor * Min
|
Values that occur when combining all gravity loadings, taking the minimum value of the following four values for each loading:
- Std Load Factor * Max
- Alt Load Factor * Max
- Std Load Factor * Min
- Alt Load Factor * Min
Plus the minimum single value of all of the lateral loadings' (of the correct type) values:
- Std Lateral Load Factor * Max
- Alt Lateral Load Factor * Max
- Std Lateral Load Factor * Min
- Alt Lateral Load Factor * Min
|
|
Rule Set
|
(not available) |
Maximum of all of the related load combination values |
Minimum of all of the related load combination values |
