• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
  • Skip to footer
Civil Sir

Civil Sir

A to Z Civil Guides

Search Here...


  • Brick
  • RCC
  • Tile
  • Cement
  • Concrete

Beam size for 1, 2, 3, 4 and 5 storey building

Beam size for 2 Storey, 3 Storey, 4 storey & 5 storey building, hi guys in this article we know about beam size calculation formula and beam size for 2 storey, 3 storey, 4 storey & 5 storey building and also know about beam size for 16 ft, 20 ft and 25 foot long span.

Beam size for 2 Storey 3 Storey 4 storey & 5 storey building
Beam size for 2 Storey 3 Storey 4 storey & 5 storey building

Sizes of beams are determined on the basis of architectural drawing & designing. If you want to design for residential building structure and where the height of building is not more than 9.5 m and spacing of columns are 4m, you can do it, but it seems little bit smaller section.

◆You Can Follow me on Facebook and Subscribe our Youtube Channel

You should also visits:-

1)what is concrete and its types and properties

2) concrete quantity calculation for staircase and its formula

When we draw beam design structure for residential building you have to also check the slenderness ratio, deflection of beam etc. as per I.S. Code guidelines.

Beam size calculation formula is depending on Clear span between two column. According to ACI Code rules and guideline span of beam measured in feet then their depth is equal or should be measured in inches. It means if span of beam 16 feet long then their depth should be 16 inches thick.

Beam size calculation:- size of beam their depth and width is calculated According to IS code 456 2000 rule and guideline, span up to 10 metre long, depth of simply supported beam should be L/20 and width of beam is equal to Depth/1.5, depth of cantilever beam is L/7 and depth of continuous beam is L/26.

Minimum RCC beam size should not be less than 9″x 9″ (230MM X 230MM), with an additional slab thickness of 125 MM. I generally use a minimum of 4 bars, with 2 bars of 12 MM thickness in the bottom of the beam, and 2 bars of 10 MM at the top of the beam. I maintain a concrete cover of 40 MM.

1) calculation of depth of beam:- For simply supported beams, L/d = 20, as per IS 456–2000

So, depth d = L/20, if span is 6m long, then depth = 6000mm/20 = 300mm

This should also be not more than 1/4 th of the clear span, as per IS 13920–2016

d= 1/4*6000 = 1500mm

Hence depth can be taken as d = 300mm.

According to ACI code depth of beam is also measured in inches depending on length of a span. Length of span is 16 feet, then their depth should be 16 inches thick.

2) calculation of width of beam? How we calculate and know about width beam, although beam width depending on the structural design but some common Thumb Rule and IS code we describe here, Width/Depth (b/d ratio) of beam should preferably be more than 0.3, as per IS 13920–2016.

So Width/Depth ( b/d) = 0.3

Width = 0.3d = 0.3 × 300 = 90 mm

But width should not be less than 200mm, as per IS 13920–2016

So take width b = 200mm.

Beam size for 1 storey, 2 Storey, 3 Storey, 4 storey, & 5 storey building

Minimum RCC beam size should not be less than 9″x 9″ (230MM X 230MM), with an additional slab thickness of 125 MM. I generally use a minimum of 4 bars, with 2 bars of 12 MM thickness in the bottom of the beam, and 2 bars of 10 MM at the top of the beam. Steel should be Fe500 Steel with m20 grade of concrete and stirrups of [email protected]″C/C. I maintain a concrete cover of 40mm.

Beam size for 1 storey (G+0) building:- For this general thumb rule, we will assume a structure of G+0 (1 storey or ground floor) residential building, using standard 9″ thick walls, size of an RCC beam should be 9”x 9” (230mm x 230mm) using 4 nos bar, 2 bars of 12mm Fe500 Steel used at bottom and 2 nos of 12mm Fe 500 used at top with m20 grade of concrete and stirrups of [email protected]″C/C.

Beam size for 2 storey (G+1) building:- For this general thumb rule, we will assume a structure of G+1 (2 storey) residential building, using standard 9″ thick walls, size of an RCC beam should be 9”x 12” (230mm x 300mm) using 6 nos bar,4 bars of 12mm Fe500 Steel used at bottom and 2 nos of 10mm Fe 500 used at top with m20 grade of concrete and stirrups of [email protected]″C/C.

Beam size for 3 storey (G+2) building:- For this general thumb rule, we will assume a structure of G+2 (3 storey) residential building, using standard 9″ thick walls, size of an RCC beam should be 12”x 12” (300mm x 300mm) using 6 nos bar,4 bars of 12mm Fe500 Steel used at bottom and 2 nos of 12mm Fe 500 used at top with m20 grade of concrete and stirrups of [email protected]″C/C.

Beam size for 4 storey (G+3) building:- For this general thumb rule, we will assume a structure of G+3 (4 storey) residential building, using standard 9″ thick walls, size of an RCC beam should be 12”x 14” (300mm x 350mm) using 6 nos bar,4 bars of 12mm Fe500 Steel used at bottom and 2 nos of 12mm Fe 500 used at top with m20 grade of concrete and stirrups of [email protected]″C/C.

Beam size for 5 storey (G+5) building:- For this general thumb rule, we will assume a structure of G+4 (5 storey) residential building, using standard 9″ thick walls, size of an RCC beam should be 12”x 16” (300mm x 400mm) using 8 nos bar,4 bars of 12mm Fe500 Steel used at bottom and 4 nos of 12mm Fe 500 used at top with m20 grade of concrete and stirrups of [email protected]″C/C.

Beam size for 16 foot span:- if span of beam is 16 foot long, then their depth should be 16 inches (400mm) thick and width of beam should be 16/1.5 =10.66″, assume 12″ (300mm) width. So beam size 12″×16″ (300mm ×400mm) in general Thumb Rule is used for 16 foot long span in residential building.

Beam size for 20 foot span:– if span of beam is 20 foot long, then their depth should be 20 inches (500mm) thick and width of beam should be 20/1.5 =13.33″,assume 12″ (300mm) width. So beam size 12″×20″ (300mm ×500mm) in general Thumb Rule is used for 20 foot long span in residential building.

  • Share on Facebook
  • Tweet on Twitter

More Important Posts:―

  1. Minimum & standard concrete slab thickness for public building
  2. What are the minimum and maximum diameter of bar used in slab, beam and column
  3. Cement consumption in plaster 1:4 for 1m2 area
  4. How many AAC blocks in 100 square metre ?
  5. What is admixture of concrete, it types and uses

Primary Sidebar

Categories

  • AAC block (12)
  • Brick (38)
  • Cement (61)
  • Cement test types (2)
  • Compressive strength (7)
  • Concrete (110)
  • Land measurement (18)
  • Rate Analysis for civil work (2)
  • RCC (143)
  • Roof slab (25)
  • Soil mechanic (6)
  • Tile (7)
  • Uncategorized (278)
  • Weight of Steel (32)

Recent Posts

  • Weight of #2, #3, #4, #5, #6, #7, #8, #9 and #10 US/ imperial rebar
  • European rebar/ reinforcing bar sizes and chart
  • Size/ diameter of 10M, 15M, 20M, 25M, 30M, 35M, 45M, 55M Canadian rebar
  • Imperial Steel/ reinforcing bar sizes and their diameter

Popular Post

Weight of #2, #3, #4, #5, #6, #7, #8, #9 and #10 US/ imperial rebar

Weight of #2, #3, #4, #5, #6, #7, #8, #9 and #10 US/…

European rebar/ reinforcing bar sizes and chart

European rebar/ reinforcing bar sizes and chart…

Size/ diameter of 10M, 15M, 20M, 25M, 30M, 35M, 45M, 55M Canadian rebar

Size/ diameter of 10M, 15M, 20M, 25M, 30M, 35M, 45M, 55M…

Imperial Steel/ reinforcing bar sizes and their diameter

Imperial Steel/ reinforcing bar sizes and their diameter…

Which is the best sand used for house construction

Which is the best sand used for house construction…

What is the standard size of kitchen room in india

What is the standard size of kitchen room in india…

Footer

About Us

At CivilSir, we share all the information related to civil engineering. So if you are a civil engineering student this is the best platform where you can improve your knowledge.

Newsletter

To get update of latest post signup below by giving you email address.

Follow Us

DMCA.com Protection Status

Copyright © 2021 CivilSir About UsPrivacy PolicySitemapGo To Top।