Load-bearing Direction and Capacity of Welded Bar Grating

How to Determine the Load-bearing Direction of Flat Steel in Welded Bar Grating

Many welded bar gratings involve the determination of the load-bearing direction. Common welded bar gratings are made by cross-welding flat steel and twisted steel, and there are also those made by welding flat steel to flat steel, known as inserted gratings. The flat steel in the grating has the highest load-bearing capacity, so determining the direction of the flat steel is crucial for our grating products.

How to determine the load-bearing direction of flat steel in welded bar grating is generally determined by the welding of flat steel and twisted steel. When customers choose welded bar gratings, the purpose of the product and its application location are related to the load-bearing direction of flat steel.

Firstly, this is a very serious matter. Welded bar grating products are formed by welding load-bearing flat steel and crossbars (twisted steel) horizontally and vertically. In the dimensions, there is definitely a length of load-bearing flat steel and a length of crossbars. We must clarify these two data and cannot make mistakes. Some technicians may not understand and casually adjust these two data, which concerns us as manufacturers because we can provide suggestions, but we don’t know the actual usage, on-site conditions, or any special requirements at the construction site. We communicate continuously with customers in a responsible manner, with the sole purpose of serving the customer well and ensuring the product is installed successfully without any issues.

Generally, the load-bearing direction of welded bar grating is perpendicular to the steel structure supports. After installing two steel structure supports, when installing the welded bar grating, the two ends of the load-bearing flat steel are placed on the supports so that it can bear the load effectively.

The load-bearing direction of trench covers and stair tread plates is different. The size of the trench cover is 7001000, so 700 is the direction of load-bearing flat steel. The load-bearing flat steel direction of stair tread plates is in the length direction because people step forward on the tread, and the walking direction is usually opposite to the direction of the flat steel. For example, if the size of the stair tread plate is 800250, then 800 is the direction of load-bearing flat steel. Due to different usage scenarios, the load-bearing direction may vary.

This is to achieve better load-bearing. The flat steel direction of the trench cover is the width of the trench. On large platforms such as ordinary power plants, the direction of flat steel is between the steel beams.

To determine the direction of flat steel is not difficult; firstly, determine the load-bearing direction of the welded bar grating.

Relationship Between Welded bar Grating Span and Load-bearing Capacity

The relationship between the span and load-bearing capacity of galvanized grating is particularly important, as it directly affects engineering quality and safety. The engineering requirement for the safe load capacity, in tons of pressure, must meet or even exceed standards. The larger the span, the larger the area that bears the load, and the smaller the load-bearing capacity. Conversely, the smaller the span, the smaller the area that bears the load, and the larger the load-bearing capacity. Below, I’ll teach you how to read the load-bearing capacity table of welded bar grating, how to select materials for fabrication, and more.

Force Direction of Galvanized Grating

Grating is composed of steel bars and twisted steel, where the steel bars play the main load-bearing role. Each steel bar must bear the load. Twisted steel (twisted bars) functions to fix the steel bars in a 90° vertical state. The reverse load-bearing force generated by the 90° flat steel bars is the greatest, while twisted steel itself has no load-bearing capacity.

How to Read the Load-bearing Capacity Table of Galvanized Grating

C represents the central load-bearing capacity (in kilonewtons), U represents the uniformly distributed load capacity (in kilonewtons), and D represents the deflection of the grating under external force (in millimeters). With 10 kilonewtons equaling 1 ton, and assuming the length of the flat steel bar is 200mm, C is 299 kilonewtons, which is equivalent to 29.9 tons, representing the safe load capacity of the 200mm flat steel bar. U is 2992 kilonewtons, or 299.2 tons, representing the overall average load capacity.

For a flat steel bar of 1000mm, C is 59 kilonewtons, or 5.9 tons. This means that a vehicle weighing 23.6 tons can pass through (5.9 tons × 4 wheels). With the same specifications of flat steel bars, it is evident that the larger the span, the smaller the load-bearing capacity.

Laying Platform and Trench Cover with Galvanized Grating

When laying steel platforms and trench covers with galvanized grating, the load-bearing capacity table is the same. The two ends of the grating carried are the points of force, and the direction of the flat steel at the two ends must be noted.

Now that you have a basic understanding of how to determine the load-bearing direction of flat steel and the relationship between galvanized grating span and load-bearing capacity, you can adjust the specifications of the flat steel according to the load-bearing capacity table to meet different requirements. However, the safety load capacity must meet standards, as the consequences could be disastrous otherwise.

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