Primary Tension in Steel Members

When a steel member is subjected to primary tension, it means that the member is being stretched or pulled apart along its length. This type of loading is commonly encountered in various structural applications such as cables, rods, and tie members.

Tie Members
A steel member subjected to primary tension is called a tie. A tie member is used to resist forces that tend to pull the structure apart. It is typically used in structures to hold beams and columns together, providing stability and preventing separation.

Tie members are commonly used in construction to connect different elements of a building or structure, such as roof trusses, bridge girders, and bracing systems. They are designed to carry tensile forces and transfer them from one component to another, ensuring the overall integrity and stability of the structure.

Characteristics of Tie Members
- Tie members are typically slender and have a high aspect ratio (length to cross-sectional dimension).
- They are designed to primarily resist tensile forces, distributing the load along their length.
- The cross-sectional shape of tie members can vary depending on the specific design requirements and structural considerations.
- Common cross-sectional shapes for tie members include circular, rectangular, and square sections.

Design Considerations
When designing tie members, engineers need to consider factors such as the magnitude of the tensile forces, the material properties of the steel, and the overall structural requirements. The design process involves determining the appropriate cross-sectional dimensions, selecting the steel grade, and ensuring adequate connections to other structural components.

The design of tie members also involves checking for factors such as stability (buckling), fatigue resistance, and overall structural compatibility. Proper detailing and connection design are crucial to ensure the safe and efficient transfer of tensile forces between different structural elements.

Conclusion
In summary, a steel member subjected to primary tension is called a tie. Tie members are used in structural applications to resist pulling forces and hold different components of a structure together. They are designed to primarily carry tensile forces and ensure the overall stability and integrity of the structure.