Download unit weight of steel hollow section -Circular-Square-Rectangle

Download unit weight of steel hollow section -Circular-Square-Rectangle

The weight of a steel hollow section is key in deciding just how heavy one might be or it will carry. It is this notion which engineers, architects, and construction professionals must know.

Since steel hollow sections are common components of buildings and other structures, those responsible for designing and constructing them should be familiar with unit weights of these materials.

What is Unit Weight?

Unit weight or density, also known as specific weight, is the weight per unit volume of a substance. For steel hollow sections: this means the weight of an entire section by its length, generally measured in kilograms per metre (kg/m) or pounds per foot (lb/ft).

A steel hollow section's unit weight depends mainly on the density of the steel used, such as carbon or mild steel; wall thicknesses for each section; and sizes of hollow spaces within it.

The density of steel is approximately 7,850 kg/m³, a standard value for most types of steel. But the unit weight of a steel hollow section varies according to its shape and size.

The most common types for steel hollow sections are square hollow sections (SHS), rectangular hollow sections (RHS) and circular hollow sections (CHS) A square hollow section is a rectangular one.

These various types each have different geometric properties which affect their unit weights together.

What Affects the Unit Weight of Steel Hollow Sections?

Shape and Geometry: The shape of the hollow section affects its unit weight significantly. Circular hollow sections (chs) have a more uniform distribution of material while square or rectangular sections may possess pronounced edges or corners. These differences result in varied amounts of steel needed to form each type of section.

Wall Thickness: The thickness of the steel walls in the hollow section is another determinant. Thicker walls will increase the unit weight. This is because more material is used to form the section, which always adds directly to its weight.

Dimensions of the Section: Larger sections by their nature entail greater volume and so weight. For instance, a large rectangular hollow section weighs more than a small one given the greater material volume entailed in its construction.

Material Grade: While most hollow sections of steel are made from mild steel, other grades steel such as high strength or stainless steel may be used depending on the application. These materials have different densities and so can affect the unit weight of final section is.

Calculation of Unit Weight for Steel Hollow Sections

To calculate the unit weight of a steel hollow section, engineers often use the formula: Unit Weight= Weight of Steel / Volume of the Section

For a hollow section, the weight is found by considering the volume of steel in the section--both outer and inner dimensions.

For instance, with a rectangular hollow section (rhs), it can be calculated as subtracting the volume of the hollow (inner dimensions) from the volume of the whole section (outer dimensions).

Let's do a sample calculation

For example, we can only express what we mean in terms of units. In a rectangular hollow section with an outside dimension of 50mm x 100 mm and inside this overall size measure is 30mm then that would have 80 by 100mm internal measurements (for cases where one leg differs from another-cases where three sides are unequally sized are still regarded as being. In such a case, the walls are 10mm thick.

The formula allows calculation of the volume of steel in the section, and its weight is then obtained by multiplying this by the density of steel (7,850 kg/m³).

Significance of Unit Weight

The unit weight of steel hollow sections has significant implications for structural design. With the weight in kg per metre, it allows engineers to accurately calculate the total load that a structure will carry.

This helps in choosing both correctly sized and appropriate type hallow sections used, which brings economic efficiency without safety sacrifice. As heavier sections require more resources to transport and install, other factors also come into play: How much material gets used? What are the financial costs associated with these extra weights-whether during shipment or in distribution?.

 

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