Wind Loads

 

 

 

In midas Gen, the automatic data entry of wind loads according to various standards is applicable for common buildings where each story can be defined and can reasonably act as a rigid diaphragm. The following procedure is observed :

 

  1.  Model the structure.

The structure must be modeled so that the gravity acts in the direction opposite to the GCS Z-direction.

 

  1. Use Building > Control Data to define the elevation of ground level in GCS Z-axis coordinate.

 

When the ground level is entered, the parts below this level are considered as underground stories and neglected in the wind load calculation. If the ground level is not specified, the lowest part of the modeled structure is assumed to be the ground level by default.

 

  1. Use Story to define stories and their floor rigid diaphragm characteristics. Enter the application position of wind loads and the width of the story subjected to pressure to generate the wind load at each story.

It is recommended that be used to auto-generate the data necessary for the stories and the application of wind loading. Where openings exist at a particular story, adjust the width of the wind pressure area.

 

Once the floor diaphragm is defined in Story, the X-, Y-displacement degrees-of-freedom and the rotational degree-of-freedom about the Z-axis between all the nodes on the plane (plane parallel to the GCS X-Y plane) are constrained.

 

In addition, a part or all of the constrained nodes can be separated from the rigid floor diaphragm using Floor Diaphragm Disconnect.

 

  1. Assign the wind load calculation standards in Wind Loads and enter the required data.

[Built-in wind load calculation standards in midas Gen]

 

Once the data required for the calculation of wind loads are defined, auto-calculate wind loads for each story in connection with the story data generated in Story. Use to verify the auto-calculated wind loads.

[Wind load generation...]

 

 

 

From the Main Menu select Load > Static Load > Lateral > Wind Loads.

 

 

 

 

Access Wind Loads to activate the dialog box defining the wind loads. Click to display the dialog box shown below.

 

 

Load Case Name

 

Select the load case name to be associated with the wind load. Click to the right to enter or modify new load cases.

 

 

Wind Load Code

 

Select the standards to be applied to the wind load calculation.

 

IBC 2012 (ASCE7-10): International Building Code 2012

 

IBC 2005 (ASCE7-05): International Building Code 2005

 

IBC 2000 (ASCE7-98): International Building Code 2000

 

UBC (1997): UBC 97 standards

 

ANSI (1982): ANSI standards

 

NBC (1995): National Building Code of Canada

 

Eurocode-1 (2005): Basis of Design and Actions on Structures

 

Note. Available National Annexes are as follows:

Recommended

Singapore

 

Eurocode-1 (1992): Basis of Design and Actions on Structures

 

BS6399 (1997): British Standard 6399 Loading for buildings

 

IS875(1987): Indian Standard

 

Taiwan (2002): Taiwan Building Code

 

NSR-10: Colombian Earthquake Resistance Building Code Ultimate Strength Design

 

(available upon request)

 

Japan (Arch, 2004): Loading Specifications and Commentaries for Buildings

 

Japan (Arch, 2000): Loading Specifications and Commentaries for Buildings

 

Japan (1987): Loading Specifications and Commentaries for Buildings

 

KBC (2009): Korea Building Code 2008

 

Korean (Arch, 2000): Buildings loading criteria and commentaries

 

Korean (Arch, 1992): Regulations related to structural criteria for buildings

 

China (GS50011-2001): Code for Seismic Design of Building

 

 

Description

 

Enter a short description.

 

 

Wind Load Parameters

 

Enter the parameters to be applied to the wind load calculation.

 

IBC 2012(ASCE7-10)

 

IBC 2009(ASCE7-05)

 

IBC 2000(ASCE7-98)

 

UBC (1997)

 

ANSI (1982)

 

NBC (1995)

 

Eurocode-1 (2005)

 

Eurocode-1 (1992)

 

BS6399 (1997)

 

KBC(2009)

 

IS875 (1987)

 

Taiwan (2002)

 

NSR-10

 

 

Wind Load Direction Factor

 

Enter the loading direction and the magnitude of wind load to be applied.

 

X-Dir.: Scale factor to be applied in GCS X-direction

 

Y-Dir.: Scale factor to be applied in GCS Y-direction

 

Z-Rot.: Scale factor to be applied in torsion about GCS Z-direction

 

Note

It is activated only when Japan (Arch, 2004) is selected.

 

 

Additional Wind Loads

 

Enter additional wind loads that the auto-calculation does not take into account.

 

Press to enter the stories to apply additional wind loads and the magnitudes for each direction.

 

: Display Tables and Graphs in a spreadsheet form for each loading direction and component of the auto-calculated wind loads.

 

Component: Assign the wind loading direction for a graphic display

 

Select Profile: Select the items to be displayed

 

Story Force

 

Story Shear

 

Overturning Moment

 

: Display a spreadsheet Text Output file showing the wind load calculation process.

 

Text Editor is automatically executed.

 

: Apply the auto-calculated wind loads to the model.

 

Note
Refer to the relevant code for details regarding the wind load calculation.