Introduction
Steel is a very integral material in construction, as steel is widely employed in many of the applications ranging from beams, girders, columns, reinforcement bars and so on. One of the most popular types of steel that is performing the role of reinforcement bars in construction is the hot rolled ribbed steel. Hot rolled steel is one of the most used materials for making a variety of construction elements. This type of steel is produced by hot rolling methods, which means heating the steel over a certain temperature and rolling it to form the particular shape desired. Even though the steel is heated, it is very strong and capable of being used in many construction projects.
The Hot Rolled Ribbed Steel is also known by other names such as banded steel or barbed steel. The ribbed shape of the steel adds extra strength to the steel products. This shape is achieved by having different sized ribs on the bar that creates an embossed pattern on it. Generally, the sizes of the ribs are between 3.0mm to 6.0mm. This gives the product a strong locking system which prevents it from stretching and makes it more suitable for construction purposes. Hot rolled ribbed steel is perfectly suitable for applications like columns, reinforced concrete beams and construction of bridges.
The Hot Rolled Ribbed Steel is very popular in a variety of construction applications because it has excellent bending properties. Steel with a ribbed shape can be easily bent, twisted and deformed to any desired shape without having to worry about it breaking or damaging. This type of steel was designed to have good bending ability which makes it extremely flexible and great for use in any project. Hot rolled ribbed steel is one of the most commonly used materials in the industry as it is extremely easy to handle, highly durable and provides excellent performance.
Performance of Hot Rolled Ribbed Steel
The Hot Rolled Ribbed Steel is known for its excellent performance when it comes to bending properties. The GB 1499-1998 is a national standard which covers the performance and requirements of hot rolled ribbed steel when subjected to bending test and reverse bending test.
Bending Test
The bending test involves stressing the steel material in a bending form until it reaches its bending limit. The bending limit of the material is determined by the capacity of the sample to withstand the load while still showing an elastic behavior. The test is conducted in a U-shaped test sample with the fixed ends. The sample undergoes a continuous displacement, and a force is applied until the sample reaches its bending limit.
The GB 1499-1998 standard states that the bending limit of the hot rolled ribbed steel should be equal to or greater than the minimum value of 17MPa. The maximum curvature of the steel should be less than 0.06 radians in order to be considered successful.
Reverse Bending Test
The Reverse bending test, also known as tension-compression test, as the name suggests, involves reversing the direction of the bend. The force is applied from one side and reversed in the other direction. This test is conducted in order to analyze the fatigue of the material when exposed to reversing the load.
The GB 1499-1998 states that the reverse bending limit of the hot rolled ribbed steel should be equal to or greater than the minimum value of 18MPa. The maximum curvature of the steel should be less than 0.15 radians in order to be considered as successful.
Conclusion
The hot rolled ribbed steel has become a popular material for construction projects due to its excellent performance in bending and reverse-bending tests. As per the specifications of GB 1499-1998, the bending and reverse-bending limit of the steel should be equal to or greater than the minimum value stated in the standard and the maximum curvature must be less than the desired value. This ensures the safety and stability of any construction project made using hot rolled ribbed steel.
