How to use reinforcement in slab beam

HI guys today im going to tell you how to use reinforcemnt in slab beam

guys if u wanna watch video about this article u can watch here video how to use reinforcement in slab beam

in this article i will tell u today what is continuous top bar what is extra top bar and what is continuous bottom bar and extra bottom bar what is dia of reinforcement what is ring what is dia of ring  what is spacer bar so on

suppose 

we hv beam its length is 6.46Meter then mostly we use 20mm dia 4 bars in the top of beam and in bottom use 25mm dia 4 bottom bars and ring dia 8mm

now how much spacing we will provide to ring so guys suppose as we did we hv length L= 6.4Meter

so we divide lentgth by L/4 where L is length of bar SO

6.4/4=1.6 METER so we will provide ring  spacing 100mm for 1.6 length in both ends of the beam and remain mid part of beam we will provide 150mm spacing among the rings after that

NOW HOW TO USE EXTRA TOP BARS IN BEAM

we provide extra top bars from support by using .3*L 

L=6.4 so .3*6.4=1.93meter length extra bars will provide in both top ends of beam

NOW HOW TO PROVIDE EXTRA BOTTOM BARS IN BEAM

extra bottom bars provide in mid section of beam for this use use .1*L

so L=6.46 now .1*6.46=.0.646Meter 

so this is the length we measure from both the ends of beam and we measure this length then after measure this length in remain length we use extra bottom bars 

WHAT IS SPACER BAR

we use spcaer bars to maintain the distance between extra bottom bars and bottom continous bars we take spacer bars dia more than bottom bars we use here 25mmdia spacer bars

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