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Duro Steel Building
Structural Design

Built Duro Tough to Last a Lifetime

We design pre-engineered steel buildings, and offer you a number of advantages over conventional construction techniques.

We design pre-engineered steel buildings, and offer you a number of advantages over conventional construction techniques. Steel buildings are inexpensive and incredibly tough. Our bolt together design is assembled quickly without any specialized skills. Each rigid frame is comprised of two or more columns supporting a rafter across the width of the building. In most steel buildings, endwall bearing frames support one-half of the load of a rigid "main" frame. In most situations, we utilize the more economical "bearing" end frames.

Adding an expandable endwall or rigid frame is only a click away. We allow you to choose the endwall condition of your building. Depending on design considerations, our endwall rafters and columns may be either hot-rolled or cold-formed.

The space between the rigid frames of a steel building is referred to as a "bay". In the illustration bellow, an 80' long building has been divided into four 20' bays by spacing the frames 20' apart (4x20'=80'). This configuration is described as "four bays at 20." A 100' building could be configured with four bays at 25 (4x25'=100')

Just about every steel building has at least one framed opening. It is not unusual for buildings to have several openings. Most openings are created for an overhead door, but can be used for the installation of glass fronts or other entries. Most other online sellers offer "field located" framed openings, which require cutting and fabricating on the job site. DB always provides factory-located openings unless your project requires something otherwise.

Connection Clips


Specially fabricated clips are designed to securely connect structural components. Many companies supply only blank plates that must be cut, drilled and/or welded to components before assembly can begin. In some cases it may require many hours of work to connect required clips. DB details and supplies each clip and placement to every building. We factory weld all clips onto rigid frames and guarantee the correct placement of all component connections. Don't waste your time and money attaching clips that should have been factory located.

Structural Bracing

Most buildings less than 60' have sufficient diaphragm action or "panel shear" that provides all the bracing needed to stabilize the building. In some cases of high winds, seismic or snow loads may cause more stress than panel shear can handle, so additional reinforcement may be required. In these extreme cases we will employ the use of X bracing to reinforce the frame. In situations where X bracing cannot be used a wind column is an excellent addition to strengthen a vertical rigid frame column. A portal frame is sometimes used in extreme load circumstances. Portal frames are fairly expensive and only necessary in rare circumstances.

Extensions can improve the appearance of the building but they will cost more. Roof extensions add "Curb-appeal" to some buildings, but it will take more time to complete the erection of the building because of the amount of extra covering trim. Extensions can also help a building blend in better in an environment of conventionally constructed buildings in commercial areas.

An overhang offers you some protection from the rain and shade from the sun. These options can be important when you receive many visitors to your building, by offering shelter from the elements.

We offer two types of roof extensions: (1) Gable Extensions for endwalls (2) Eave Extensions for sidewalls. Using our system, you can easily design and price buildings with overhangs up to 5' on any or all the walls.

Unlike our competitors, we allow you to price all building frame types. Select from Clear-span or Modular rigid-frame buildings. We allow you the full flexibility to choose Gable, Single Sloped or Offset Peak building shape. By far, we offer the widest selection of building and frame types. For options not available through the online system, you will need to request a special quote. Just about every steel building has at least one framed opening. It is not unusual for buildings to have several openings. Most openings are created for an overhead door, but can be used for the installation of glass fronts or other entries. Most sellers offer "field located" framed openings, which require cutting and fabricating on the job site. DB always provides factory-located openings unless your project requires something otherwise.

Clear-span Frames

A clear-span rigid frame offers strength and economy. Since no interior supports are necessary, this design is best when you require large areas of clear and uninterrupted space. Factories, warehouses and agricultural buildings are just a few building types that may utilize a clear-span frame building. A clear-span design does have size limitations. As the desired width increases, the frames will become larger and heavier to carry greater loads across the length of the frame. At some point the cost will outweigh the benefit. Even so, clear-span buildings are still effective for buildings as wide as 150' feet and wider in some cases.

Modular Frames

Modular frames use interior columns to evenly distribute the load; reducing the cost of both the frame and foundation of extra wide buildings. The economical advantages become obvious when a building width is about 100' wide or wider. As a result, almost all buildings 100' wide or wider have interior support columns. Modular designs are often used for large factories and warehouses.

Single Slope Frames

Single slope frames have high and low eave heights creating a roof that "slopes" from side to side. To select a single slope design, you specify one eave height and define the roof pitch. Single slope designs are frequently used for strip shopping centers, offices, and RV/Boat storage facilities.

The angle of a steel building's roof is determined by roof pitch. Roof pitch indicates the rise vertically for every 12 inches of horizontal travel. Our system allows you to choose anything from a .5:12 up to a 6:12 roof pitch. There are many considerations with both higher and lower roof pitches. Our experts can best assist you in dermining the ideal roof pitch for your specific needs and keep you in compliance with all ocal building codes.

Higher pitched roofs may add to the cost of the building, but can add performance to a building in a heavy snow region. Additionally, you can take advantage of extra space above. High-pitched roofs are less likely to leak and can add style to your building.

Low pitched-roofs require less material and therefore cost less. Also it's easier to heat and cool a building with a low-pitched roof. One major advantage of a low-pitched roof is expandability. If you ever add-on to your building you will be able to add more space while keeping the loss of headroom to a minimum.

Why we ask for your Zip Code

We use this data for two reasons: 1) This allows us to accurately determine the distance between your location and our nearest shipping point. 2) We use this data to estimate the building code and design loads for your area. This is only an estimate. It is your responsibility to contract your local building official to determine the exact loading for your area. Some zip codes cover a wide area so the design loads may very within a zip code.

Building Code

Building codes are intended to provide for the safe use of buildings and structures under "normal" conditions. The code describes exactly how each part of the building should be loaded and designed. These loads are based on Snow load, Wind Speed, Seismic Coefficient (earthquake), Collateral load and Exposure. These loads will be applied in various "Design Combination" to determine the most critical loading. From these combinations all member sizes and spacing will be determined.

Snow Load

In the northern US, design of a building to withstand snow loading is critical. Snow loading is dependent on several factors. These factors include roof slope, if the structure is heated, if the structure is insulated, if the roof slope is slippery or if it contains high friction that will "hold" the snow on the roof. Our pricing system takes the most conservative of these factors into consideration when designing your building.

Wind Speed

As wind blows it places pressure on the building. The exact pressure is based not only on the formulas and tables contained in the specific building code chosen, but also the size and shape of your new building. By entering the Wind Speed, our pricing systems will give the optimum member sizes and their spacing.

Seismic Coefficient

This is the influence of earthquake activity on your steel building. The higher this number the more influence seismic has or the greater the seismic loading. Some building codes such as the Uniform Building Code (UBC) or the California Building Code (CBC) also use seismic zone. These also influence seismic design; Zone 0 having the least influence and Zone 4 having the greatest.

Collateral Load

The collateral load is the loading on the building caused by additional construction materials such as a false ceiling, sprinkler system, lighting, Heating/Air-conditioning duct, etc. The following table is recommended loadings for each type of collateral load.

Exposure

The characteristics of ground surface irregularities (natural topography and vegetation as well as constructed features) for the site at which the building is to be constructed.

Exposure A - Large city centers with at least 50% of the buildings having a height in excess of 70 feet.
Exposure B - Urban and suburban areas, wooded areas, or other terrain with numerous closely spaced obstructions having the size of single-family dwellings or larger.
Exposure C - Open terrain with scattered obstructions.
Exposure D - Flat, unobstructed areas exposed to wind flowing over open water (excluding shorelines in hurricane prone regions) for a distance of at least 1 mile.

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Address

351 South Cypress Road
Suite 100
Pompano Beach, FL 33060

Contacts

Email: sales@durobuildings.com
Phone: 888-848-2011
International: 001-954-927-6566
Fax: 954-927-5670