development length and beam that is first of all if you don’t know what is development length so let me draw its diagram for developmentally guys you can see suppose this is a beam this is beam okay and here this is column okay horizontal is beam vertical is so inside beam we are using steel reinforcement as you can see here okay compression and also tension so now guys this steel reinforcement when we join the steel reinforcement and so we are providing the extra length our extra bar okay additional bar we are providing same like this and it’s going downward like this and the tension bar is going through upward side so this extra or additional bar is called development okay so this is called development ld by small you can denote.
it this okay so this is called development okay so what are the reason for 01:51 providing dual pin length why we are okay so the first reason is guys develop a secure bond between the surface of the bar and the concrete so therefore we are providing development length to make a good bond between steel and concrete so therefore we are providing extra bar so from here we are going to the section or the junction and then going to the downward side and the tension bar is going to the upward side so this length we can get for uh we can get from uh different structures okay for a different structure we are taking different length development length so especially depend on the grade of steel rod okay steel uh steel reinforcement for different grade now here so that so develop a secure bond between steel and concrete okay so that any failure that any fear failure due to slippage so here it slips so actually the steel is slipped from.
The concrete our concrete can be slipped from the steel so in any failure due to slippage of the bar does not occur during the final load condition so therefore if you don’t provide development length so the concrete will be slip or the steel will be slip from the in the junction especially from concrete or concrete from uh steel okay so therefore in any failure okay so it can support the structure load or if you apply the final load so in final load condition it doesn’t occur okay or it doesn’t slip okay so this is the main reason second additional length of the bar provided this additional length of bar or development length is provided as the length of growth okay as the length of the growth is attributed to the stresses attributed to the stresses developed in any section of the adjacent section this is very important guys in this place okay actually.
We providing the development length at the end of the support because at the end we have maximum shear stresses okay so let me easy for you this okay so actually a transfer the stress are load from the beam to column smoothly so therefore we are providing development length because this is the beam when the load comes on the beam so beam transfer the load to the column smoothly so here we have maximum shear stresses so due to shear stresses okay it make uh it can be slip so therefore to ah to prevent this uh sleeping of concrete from the steel we providing development length okay so here guys so this is also uh very important which i am telling you here such as the additional length mean this development length of the bar provided from the beam to the column so from the beam to the column this additional lens so look here this is the beam so from the beam to the column okay at the column beam junction okay so here we are providing especially in the junction also because we have maximum shear stresses there so to provide the development length because.
It makes a good bond between steel and concrete so the concrete can’t be slip or make slippage in any failure if you provide if you don’t provide so the concrete can be slipped from there so you will face more problems okay so therefore it can also provide the crates okay and how we can get this length or what is the formula for development length so actually uh i will tell you commonly if you don’t know about the steel structure design or if you are not related with this subject so the development length should not be less than one feet okay mean 12 inches are 30 centimeter okay but for a different structure load we have different development length and also different development length is also depend on the different grade of steel rods hope this