The current construction of building structures is dominated by reinforced steel. Reinforced steel bars are preferred for their unmatched tensile strength which the concrete is weak to provide and ductility factor, that helps to withstand the load of the structure. There are different grades and different diameters (mm) of the reinforced bars in the current market namely Fe 415, Fe 500, Fe 550 and Fe 600.
Reinforced steel bar comes in different lengths, so during constructing the building structure, there will be scenarios where reinforced bars of higher lengths than the standard length must be used. But such bars of high lengths are not feasible for construction purposes, therefore to overcome this challenge, the splicing technique is performed.
So, what does splicing means, It is explained further
Splicing on reinforced steel
Splicing is a technique in which two reinforced bars of standard lengths are joined and are then wired together to form single rebar that has higher length. Typically the reinforced steel bars can come in lengths of up to 40 feet. But such long reinforced bars are troublesome to manufacture and transport by trucks. This is why the splicing technique is used.
When the two reinforced bars are joined by splicing, the force is effectively transferred from one bar to the other through bonds in concrete. Another advantage of splicing is the efficient use of reinforced bar materials. The splicing process is the sole factor in transferring the forces through the reinforcement bars by creating a proper load path. The structural integrity of the building is affected if the splicing procedure is done incorrectly
The IS Standard
In India, the splicing of the reinforced steel bar is covered under IS 456 (2000) clause 26.2.5. According to the standard, splicing must be done at areas that are far away from the sections of maximum stress on the reinforced bar. It also mentions that splicing of flexural members should not be done at sections where the bending moment is more than 50 per cent of the moment of resistance. At any given section, not more than 50% of reinforcement bars should be spliced.