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This page is devoted to frequently asked questions (FAQ) related to auto lateral loads. |
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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:
- Define the wind auto lateral load.
- Assign wind-pressure coefficients using the Assign > Area Loads > Wind Pressure Coefficients option.
Is it possible to
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Open Question
Could you provide simple example with sketches of how the auto lateral wind load is applied for exposure from diaphragms and for exposure from area objects?
Open Question
How can I apply auto lateral wind load to 3D frame structure?
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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:
- Define a load pattern, designate the type as Wind, and specify the load as an auto-lateral-load pattern, such as ASCE 7-05.
- Select Modify Lateral Load Pattern > Exposure from Frame and Area Objects > Include Frame Objects, and define wind-direction angle, along with other parameters.
- 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), and would like to apply wind loading according to BS standard. The procedure requires the definition of diaphragms, but would not this affect the analysis? I used the wave wind form but this is limited to API code.
Answer:
You have the following two options:
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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,
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- use dummy area objects to apply
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- wind loads using exposure from area objects. This
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- may be specified
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- using the BS 6399-95 Wind
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- Load Pattern menu.
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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 |
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.
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ANSWER 2: 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. VERIFY |
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.
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Related Incident:
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TO DO: |