#### Load Calculations | Design of Buildings

**In our earlier article, we discussed “Different types of loads” and their importance in Structural design.**

#### Now we will move on with our further discussion on the following points:

- Design principle assumption and notation assumed
- Design Constant
- Assumptions regarding Design
- Loads on Beams
- Loads on slabs

#### Design principle assumption and notation assumed:

The notations adopted throughout are same as given in IS:456:2000

Density of material used in accordance with reference to IS:857-1987s

Sr.no | Material | Density |

1 | Plain concrete | 24 KN/m3 |

2 | Reinforced cement concrete | 25 KN/m3 |

3 | Flooring material (cement mortar) | 1.00 KN/m3 |

4 | Brick masonry | 19 KN/m3 |

#### Design constant

**Using M20 and Fe415 grade of concrete and steel respectively for columns and footings**

Therefore:

Fck – i. e. Characteristic strength for M15 – 15 N/mm2

Fck – i. e. Characteristic strength for M15 – 15 N/mm2

Fck – i. e. Characteristic strength for M20 – 20 N/mm2

Fy – i. e. Characteristic strength for steel – 415 N/mm2

#### Assumption regarding Design

- Slab is assumed to be continuous over interior support and partial fixed on the edge, due to monolithic construction of walls over it.
- Beams are assumed to be continuous over interior support and they frame in to the column at the ends.

#### Load on Beams

#### Description of load of slab on beam

The load of slab is dispersed on to the supporting beams in accordance with clause 23.5 of IS:456-1978, which states that the load on beams supporting solid spans, spacing in two directions at right angles and supporting uniformly distributed loads.

#### Self weight of beams

This load acts on the beams as a UDL, this is calculated after assuming the suitable cross section (by stiffness/deflection consideration) of the beam.

#### Load due to brick masonry wall

In a framed structure, brick masonry are used to construct curtain walls. They do not carry or transfer any load. Hence, the masonry walls do not have to thick.

#### Point load from intersecting beam

If there is any beam meeting the beam then the load of that beam is considered as point load.

#### Loads on slabs

Three types of loads are to be considered for the design of slabs:

- Dead load of the slab
- Live load of the slab
- Floor finish load

#### Dead load of the slab

**Self weight of slab acts:**

This load acts as UDL, this is calculated after assuming the 1m wide square strip and suitable thickness consideration.

#### Floor finish load

This load also acts as UDL and this is calculated after assuming suitable intensity over 1m wide strip.

#### Live load on the slab

This is the temporary load on its intensity depends on type and occupancy of building.

The intensity can vary with the type of building.

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#1 by

Arup Kumar MItraon March 12, 2012 - 11:47 pmI want to know that during construction of 1st floor I found that there is a beam 10″ width/6″thickness & pillor to pillor length is 10′ and there is another parallal beam within 5′ (distance) size is 5″/5″ & length is 10′ on 5″ wall but it’s both sides are connected with cross beam. Now give me the suggesstion that can I put a brick wall (10′ length) in between those two beam & the distance of that wall should be within 2′ from 5″/5″ /10′ (beam on wall) beam & 3′ from another beam if it is then please inform me at earliest at per return mail

#2 by

n.k. meshramon June 15, 2012 - 4:34 ami want to know how to calculate total load on various types of slab ie continuous slab simply supported slab

#3 by

BenzuJKon June 30, 2012 - 4:56 amHello,

Check out the following link. It will answer most of your questions.Building Design guide

#4 by

Chinmayaon November 8, 2012 - 5:31 amPlease put up steps involved in “designing of continuous slabs”. I’d be very greatful.

#5 by

devarajon November 10, 2013 - 3:50 amsir/madam

we r planing to alter our first floor house

problem is it has beam but no columns so i need a guide will u help me to plan a duplex

thanks

devaraj

#6 by

satyendu kumar balon October 1, 2014 - 11:21 amhow can i layout my columns when no architechrual dwg is avail.

#7 by

BenzuJKon October 26, 2014 - 4:59 pmHello Mr Kumar,

Why would you want column layout without architectural drawings? You would be spending lacs to get your house built. Don’t you think it would be a good idea to employ an Architect and a Civil Engineer to get your dream house designed and constructed?

#8 by

narendra mevadaon February 6, 2016 - 3:27 pmplease, give me slab and beam load calculation Or Pactical LOAD SLAB ON SYNTEX WATER TANK

#9 by

JAHID HASANon May 19, 2016 - 6:42 pmlive load, dead load, slab, beam footing calculation math