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This page is devoted to *frequently asked questions* (FAQ) related to [auto lateral loads|kb:auto lateral load].
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h1. Modeling and application


h2. How do I assign wind auto-lateral-load conditions?

*ANSWER:* Wind [auto lateral load|kb:Auto lateral load] may be assigned as follows:

# Define the wind auto lateral load.
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# Assign wind-pressure coefficients using the Assign > Area Loads > Wind Pressure Coefficients option.


h2. Is it possible to apply wind load to only a specific frame object?

*ANSWER:* Yes, wind load may be applied to specific [frame|kb:Frame] objects through the process which follows:

# Define a [load pattern|Load pattern], designate the type as _Wind_, and specify the load as an _auto-lateral-load_ pattern, such as with ASCE 7-05.
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# Select Modify Lateral Load Pattern > Exposure from Frame and Area Objects > Include Frame Objects, and define _wind-direction angle_, along with other parameters.
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# Designate the frame objects for wind auto-lateral-load application through Assign > Frame Loads > Open Structure Wind Parameters.


h2. How is wind load applied per BS standard?

*Extended Question:* For modeling a {new-tab-link:http://en.wikipedia.org/wiki/Floating_Production_Storage_and_Offloading}Floating Production Storage and Offloading{new-tab-link} (FPSO) unit as a 3D frame system, how would I apply wind load per BS standard? The Wave Wind form is limited to API standard, and I'm concerned that diaphragm definition would affect analysis.

*ANSWER:* Two options are available, described as follows:

* Define dummy diaphragms then assign each to a single point object. Each point object then becomes the location where wind load is applied. Tributary area is specified using the Wind Exposure Width Data form.

* Alternatively, use dummy area objects to apply wind loads using exposure from area objects. This may be specified using the BS 6399-95 Wind Load Pattern menu.


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*Diaphragm
and area object exposure diagrams*

*Question:* Would you please provide an example and diagrams showing how wind auto lateral load is applied given diaphragm and area object exposure?

*ANSWER:* {open-question}
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h1. Display


h2. Is it possible to display auto-lateral-load application?

*ANSWER:* Yes, auto lateral load may be displayed. The seismic auto-lateral-load pattern applied to structural [joints|kb:Joint], for example, may be reviewed in tabular format under Model Definition > Load Pattern Definitions > Auto Seismic Loads > Table: Auto Seismic Loads to Joints.

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*ANSWER:* Currently, it is not possible to display calculated wind pressures, though users may indirectly verify pressures by creating a test model. Assigning area-object exposure, for example, users may create a model with area objects located at different elevations and supported by lateral springs. Auto-lateral-load application of wind pressure on these area objects would yield spring displacements and reactions which correlate with applied pressure.
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h1. Formulation


h2. How do I find the period used to calculate the auto-seismic load?

*ANSWER:* All parameters, including structural period, are reported in the table available through Load Pattern Definitions > Auto Seismic Load.

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*Related Incident:*
* {incident:no=47806|comment=How to display the period used in calculating an auto-seismic load?}
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