Joist Girder

Standard girder designations can be shown as follows:

• Joist Girder "G"
• Joist Girder "VG"
• Joist Girder "BG"

Types of Girders:

G Girder Configuration

VG Girder Configuration

BG Girder Configuration

Girders vs. Joists:

A girder is a primary, load-carrying structural element that supports other structural elements like beams and joists. A joist, on the other hand, is a secondary load-carrying member that directly supports floors and roofs. While both girders and joists can be made with an open web system, their function and placement in the building structure differ.

Girders are primary framing members that transfer loads from joists to columns or other vertical supports. They are usually larger and stronger than joists, designed to handle heavier loads over longer spans. Joists, being secondary members, are supported by these girders and directly bear the weight of the floor or roof deck.

Joist Girders vs. W-Beams

Joist girders are primary structural members designed specifically to support the concentrated loads applied by steel joists. They offer distinct advantages over solid web wide-flange beams in certain applications: [1, 9]

• Lighter Weight: For similar load capacities, a joist girder is often deeper but significantly lighter than a wide-flange beam, resulting in lower material costs and easier handling.
• Open Web Design: Similar to joists, the open web of a joist girder allows for convenient passage of mechanical and electrical systems, enhancing construction flexibility.
• Cost-Effectiveness: Due to their efficient use of steel, joist girders are generally more economical than wide-flange beams for typical loading conditions and configurations.

Joist Calculations

Joist calculations ensure that steel joists meet all structural performance and safety standards. We provide two types of calculations to support your project needs:

For Approval:

Approval calculations are mandatory before fabrication begins. These calculations require review and approval by the Engineer of Record (EOR) to confirm compliance with building codes and safety standards. Approval calculations typically include a full engineering analysis and a registered engineer’s seal, guaranteeing that the joist design meets all structural requirements.

For Record:

Record calculations are generally provided at no extra cost. These allow the project to move forward while awaiting full approval calculations. Record calculations support the fabrication process but do not require formal EOR approval before work begins, enabling a faster start while maintaining design integrity.

Certifications:

For open web steel bar joists, required certifications are generally specified in project documents, including specifications, drawings, and contracts. Certifications ensure compliance with structural and safety standards, and we are prepared to guide you through the submittal process with all necessary documentation for these certifications.

SJI Manufacturers:

Every open web steel joist that we supply is manufactured to exact specifications by Steel Joist Institute (SJI) members, which means that you can be assured of the highest quality product.

Made in America:

Our products are made with US made steel. When mill certificates are required, we can provide you the material's physical and chemical properties. Contact us for more information regarding mill certs for your project.