DETAILING OF LINTEL BEAM

STEP1: Calculate Length
Of One Main Bar
Length of one bar = Length of door opening + (2 x bearing
length) – clear cover for both sides
Length
of door = 1200mm  1.2m
Bearing
length = 150mm (150 mm to 200 mm bearing length
should be provided and it should be placed on the motor.)
Clear cover = 25mm (we will take 25mm as clear cover)
Length of one bar = 1.2+ (2 x 0.150) – 0.025 =1.475m
STEP2: Calculate
Total Length Of Main Bars
Before we calculate the total length
of the main bars. We should know how many bars we are going to use in lintel
reinforcement.
Below tips from lceted will help
you to select proper how many bars we should you
STANDARD LINTEL SIZE FOR DOOR OPENING &
REINFORCEMENT DETAILS

As we have a length of the lintel is more than 1.3m so we will have
to choose 5nos of bars for the lintel reinforcement
So,
We need 5 nos of 1.425m length of 10mm bars. In that case
Length of 5 bars = 1.425 x 5 = 7.125m
STEP3: Calculate Weight Of
Steel For Main Bars
Weight of steel for 10 mm bar = D²L/162 = 10² x 7.125/162 = 4.398 kg.
STEP4: Calculate Length Of One
Stirrups
As we know size of bar is 200mm x 200mm
Cutting length of stirrups = (2x depth distance) +(2xWidth
depth) + Hooks Length – Bend
Depth distance = depth – (2 x clear cover) – (dia of stirrups)
Depth distance = 200 25 25  8 = 142 mm
width distance = depth – (2 x clear cover) – (dia of stirrups)
width distance = 200 25 25  8 = 142 mm
Hooks length = 9d
Bend = 2d
We have 2 hooks and 5 bend
So,
Cutting length of stirrups = (2×142) + (2 x 142) + (2x9x8) –(5x2x8)
= 632 mm = 0.632 m
STEP5: Calculate No Of
Stirrups
No of stirrups = (Total length of lintel / distance between
strriups) + 1
= (1.475/0.150) + 1 = 10.8 = 11nos
Total length of stirrups = 0.632 x 11nos = 6.952m
STEP6: Calculate Weight Of
Steel For Stirrups
Weight of steel for stirrups = D²L/162 = 8² x 6.952/162 = 2.746 kg.
So we can order steel bar as,
7m (6.952) of 8mm bar
7.5m (7.125) of 10mm bar
Must Read: Types of TMT Bars and Thier Uses In Construction
Must
read: BBS
Basics: Lapping, bend, development and hook length calculation
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