Reinforcement Cold-bent Crack
The reinforcement of cold-bending crack is one of the most frequently encountered problems in the reinforced concrete structure engineering. It is caused by the large external force applied to the steel bars during the processing of reinforced concrete beams during the construction process. The problem of reinforcement cold-bending cracks is very common in reinforced concrete structures throughout the world and is often the cause of structural failure. The structural damage caused by this problem can be divided into two categories, namely, the crack caused by the cold-bending of the reinforced steel bars and the crack caused by the excessive stiffness variation of the reinforced concrete beams.
First of all, the specific cause of the reinforcement cold-bending crack is due to an excessive stiffness variation of the reinforced concrete beams during the cold-bending process. This stiffness variation is usually caused by an uneven stress distribution on the steel bars when the beam is being bent. The uneven stress creates a greater chance of the steel bars being bent too severely, which leads to the reinforced steel bar cracking during the cold-bending process. The cracks that this causes in the reinforced concrete beams can significantly reduce the overall structural integrity of the building or structure that the beams are part of.
Secondly, the reinforcement cold-bending crack can also be caused by the inadequate processing of the reinforced steel bars during the cold-bending process. This inadequate processing is usually due to an improper heating or cooling of the steel bars prior to the cold-bending process. If the steel bars are heated or cooled too quickly, this can lead to uneven tempering and cooling of the steel bars, which results in an abrupt structural weakening of the reinforced steel bar. This weakening can further lead to cracking during the bending process.
Finally, the reinforcement cold-bending crack can also be caused by a poor choice of the supporting materials used in the reinforced concrete structure. If the supporting materials used in the structure are not rigid enough to reduce the stiffness variation of the reinforced concrete beams during the cold-bending process, this can also lead to cracking of the reinforced steel bars. This can further weaken the overall structural integrity of the reinforced concrete structure during the reinforcing process.
Reinforcement cold-bending crack is a serious problem in the reinforced concrete structures engineering. It is necessary to identify the cause of the crack and take appropriate measures to eliminate the crack or reduce its severity. The most common solutions include using appropriate quality and grade of reinforced steel bars during the bending process, providing adequate support for the reinforced steel bars during the cold-bending process and the appropriate design of the reinforced concrete structure.
