In reinforced concrete structures, two materials with different properties can bear the load together because of the bonding and anchoring effect between them. This effect enables stress transfer between the steel bars and the concrete on both sides of the contact interface, which establishes the necessary working stress for structural bearing in the steel bars and concrete.
The bonding and anchoring effect of steel bars in concrete is characterized by adhesive force or the chemical adsorption effect on the contact surface, but its influence is not significant. It is related to the roughness of the contact surface and the lateral pressure, and its effect decreases gradually as sliding develops. The bite force is generated by the ribbed steel bars under the pressure of concrete before the rib. Mechanical anchoring force is the main source of anchoring force for ribbed steel bars, which refers to the anchoring effect provided by measures such as bending hooks, bending and additional anchoring (such as welding anchor plates and pasting welded steel bars).
Toughness: The ability of metallic materials to resist impact loads without being destroyed.
Hardness: The ability of metallic materials to resist objects that are harder than them being pressed into their surface.
Ductility: The ability of metallic materials to produce permanent deformation under load without being destroyed.
In Steel Searcher steel bar exporter, Cold bending of steel bar is an indicator of their plasticity and also a requirement for their processing. When bending hooks, steel bar cracking and breaking should be avoided. Hot-rolled low-strength steel bars have good cold-bending performance, while those with high strength have slightly worse performance, and the cold-bending performance of cold-drawn steel bars is the worst. The weldability of steel refers to the difficulty of obtaining high-quality welding joints by using certain welding materials and welding process conditions, that is, the adaptability of steel to welding processing.
Steel bar is one of the important materials for building houses. What are their types and characteristics? According to the different production processes, they can be divided into hot-rolled steel bars, cold-rolled ribbed steel bars, cold-rolled twisted steel bars, steel strand, stress-relieved steel wire, heat-treated steel bars, etc.
Performance of hot-rolled steel bar: Hot-rolled steel bars are the finished steel bars formed by hot-rolling and natural cooling, which can be divided into hot-rolled plain steel bars and hot-rolled ribbed steel bars.
Quenched and tempered steel bar: Quenched and tempered steel bars are finished steel bars obtained by hot rolling, followed by surface controlled cooling through water immersion, and then tempering treatment using residual heat from the core.
Cold-rolled ribbed steel bar: Cold-rolled ribbed steel bars can be used for industrial and civil construction without vibration load and repeated load. They can also be used for small structural components in reinforced concrete and pre-stressed concrete by pre-tensioning method. They can also be used as hoop beams, structural columns, and masonry reinforcing bars in brick-concrete buildings.