| Units |
Select units of Length, Force, and Moment for use on this page. |
| Machine Locations |
Type X, Y, and Z distances from the reference point to the point of action (CG) of each machine. |
| Dynamic Loading Input |
Select the method used to input dynamic machine loads. Direct input of supplied load or program generated loads are available.
- Direct Loading – Select this method to input load supplied by an equipment manufacturer.
- Eccentricity – (Rotary machines only) Based on machine unbalance provided by the manufacturer, the unbalanced force is calculated per ACI351.3R-04 clause 3.2.2 equations 3-3 and 3-4.
- Empirical Method – For rotary machines with no unbalance information provided, the unbalance force is calculated per ACI 351.3R-04 clause 3.2.2 equation 3-7.
For reciprocating machines, the primary and secondary loads are calculated per ACI 351.3R-04 clause 3.2.3.1. The primary force parallel to the piston movement is generated based on equation 3-20 and the primary force perpendicular to piston motion is calculated per equation 3-19. Secondary force, which is only present parallel to piston movement, is calculated by equation 3-21.
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| Machine Eccentricity (e) |
(For Eccentricity loading only) Type the eccentricity for each machine in the selected units (which may be different than the primary unit of length used elsewhere on this page). Note: Table ANSI/ASA S2.19 is available by clicking on the Machine buttons.
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| Dynamic Forces |
(For Direct Loading only) Specify the dynamic force for each machine, if supplied. |
| Machine Rotating Weight |
Type the weight of each machine while in use, in the selected units of Force. |
| Machine Reciprocating Weight |
(Reciprocating machine only) Type the reciprocating weight of the machine, in the selected units of Force. |
| Machine Speed |
Type the rotating speed of each machine. |
| Static Weight |
Type the static weight of each machine or gearbox, in the selected units of Force. |
| Loading Parameters |
| Setting | Description |
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| Material Damping |
Type a damping ratio (in percent) to use for material damping of the foundation. By default, 5% material damping is used for concrete. Adjustment due to soil spring material damping is based on ACI 531.3R-04 clause 4.2.4 equation 4-23. |
| Number of Mode Shapes |
Type the number of mode shapes to use for dynamic analysis to ensure an acceptable mass participation. A larger number of mode shapes will increase the analysis time. |
| Consider Out of Phase Loading |
Set this check box to consider out-of-phase effect of dynamic loading for multiple machines operating on a combined block. |
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