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This page is devoted to *frequently asked questions* (FAQ) related to [acceleration|Acceleration].
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h2. Acceleration-loadHow calculationis acceleration *Question:* How does [SAP2000|sap2000:home] calculateload calculated and apply acceleration loadapplied?

*Answer:* Please see the [Acceleration load|Acceleration load] article for response.


h2. Rotational-acceleration-load calculation

*Question:* What procedure does {new-tab-link:http://www.csiberkeley.com/}CSI{new-tab-link} Software use to calculate rotational-acceleration loadHow is rotational-acceleration load calculated and applied?

*Answer:* Please see the [Acceleration load|Acceleration load] article for response.


h2. DifferenceWhat is the difference between _relative_ and _absolute_ acceleration?

*QuestionAnswer:* The Display > Show Plot Functions menu presents options for either _relative_ or _absolute_ acceleration. What is the difference between these options?

*Answer:* Relative acceleration is within the reference frame local ofto the structure. Absolute acceleration is within a universal reference frame, and is given as the sum of relative acceleration and ground acceleration.

The same relative and absolute designations also apply to velocity and displacement.


h2. ManualIs application of acceleration load 
*Question:* Can acceleration loads only be applied applied only to selected members in a model?

*Answer:* {new-tab-link:http://www.csiberkeley.com/}CSI{new-tab-link} Software automatically generates and envelopes a set of acceleration loads for translation along, and rotation about, each global axis. These acceleration loads are applied at each node and element, and used to simulate ground motion during [time-history|Time-history analysis] and translation-only [response-spectrum|Response-spectrum analysis] analyses. They are also useful as starting load vectors for [Ritz-vector|Ritz vectors] analysis.

Users may manually assign acceleration loads to specific nodes and elements. Similar to [load-case|Load case] assignment, these loads are applied through an _analysis case_.