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Modeling and application

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

ANSWER: Wind auto lateral load may be assigned as follows:

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

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

ANSWER: Yes, wind load may be applied to specific frame objects through the process which follows:

1. Define a load pattern, designate the type as Wind, and specify the load as an auto-lateral-load pattern, such as ASCE 7-05.
2. Select Modify Lateral Load Pattern > Exposure from Frame and Area Objects > Include Frame Objects, and define wind-direction angle, along with other parameters.
3. Designate the specific frame objects for wind auto-lateral-load application through Assign > Frame Loads > Open Structure Wind Parameters.

How is wind load applied per BS standard?

Extended Question: For modeling a Floating Production Storage and Offloading (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.

Display

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

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

Formulation

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.