Rigid Frame Steel Buildings San Tan Valley AZ

Endwall Considerations

It's important to recognize the different types of endwalls when designing you steel building. Each has its own advantages and special considerations to be taken into account.


Three Basic Endwall Types

  • Expandable Main Frame

  • Non-Expandable Main Frame

  • Bearing Frame


Non-Expandable Main Frames

The non-expandable main frame endwall is still a main frame with endwall columns, but cannot be used for future expansion. The non-expandable frame can only carry the design load of one half bay.

Both the Expandable and Non-Expandable main frame endwalls provide for more flexibility and ease in locating large framed openings or entrance doors. Locate the openings by simply adjusting the endwall columns spacing. Also, the main frame endwalls do not require any form of bracing, therefore, X-bracing or portal frames will not interfere with large openings.

Bearing Frames

A bearing frame (post and beam endwall) is our standard endwall condition. The endwall columns are generally made of cee channel and at times can be back to back cee channel. The bearing frame is designed to support only one half bay of roof load, and cannot be used to expand the building in the future.

The endwall columns support the channel rafter and also serve as columns for attachment of the endwall girts and transmit wind load into the foundation and structural system. Bearing Frame Endwalls also require a form of bracing, whether it be X-bracing, portal frames, or diaphragm action.

The use of a bearing frame endwall is a matter of economy. You will usually find the prices of the bearing frame endwalls to be less than one half the cost of the expandable main frame endwalls.

Endwall Cost Considerations

Different types of endwalls can be interchanged to offer advantages in specific applications.

The expandable clearspan main frame endwall can provide an entirely open endwall up to 150′ wide. This could be the answer to a covered truck dock across the end of the building; or, total flexibility in placement of framed openings.

It is also possible to interchange the interior modular main frames comprised of different modular spacing. For example:

The 120′ wide building could have 3 – 40′ wide modules or 2 – 60′ wide modules. By interchanging some 60′ module frames within the structural system we can retain the lower cost of the interior columns yet provide larger unobstructed areas.

Also, using the 3 – 40′ modular main frame endwall in place of the 2 – 60′ module spacing, you would be able to place an overhead door in the center of the endwall without difficulty.


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