Posts Tagged Load Calculations
Understanding Load Calculations | Structural Design
Posted by BenzuJK in Building Construction on January 19, 2012
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
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Bending Moment and Fixed Moment Calculations
Posted by BenzuJK in Building Construction on December 26, 2011
Bending Moment and Shear Force diagrams
What is Bending Moment?
The element bends when a moment is applied to it. Every structural element has bending moment. Concept of bending moment is very important in the field of engineering especially Civil engineering and Mechanical Engineering.
Unit of measurement: Newton-metres (N-m) or pound-foot or foot-pound (ft.lb)
Bending moment is directly proportional to tensile and compressive stresses. Increase in tensile and compressive stresses results in the increase in the bending moment. These stresses also depend on the second moment of area of the cross section of the element.
What is Shear stress?
Shear stress is defined as the measure of force per unit area. Shear stress occurs in shear plane. There are many planes possible at any point in a structure which can be defined to measure stress.
Stress = Force/Unit area
Example: Bending Moment and Shear Force Calculations
Frame diagrams | Bending moment and shear force calculations
Simply supported bending moment
Mab = wl2/8 = (22×4.14×4.14)/8
= 47.13 KN-m
Mbc = wl2/8 = (22×4.14×4.14)/8
= 47.13 KN-m
Calculation of loads for Foundation Design | Structural Design
Posted by BenzuJK in Building Construction on August 1, 2011
How to calculate the total load on the footing? | Building Construction
This article has been written on the request from my readers. Engineering students generally get confused when it comes to calculating loads for footings. They ask weird and inappropriate questions regarding the load calculations. This is because they haven’t understood what loads are to be calculated when footing/foundation for a building is designed.
Calculation of loads is extremely simple. I hope after reading this article, the queries of many of my readers would get a satisfactory answer.
Four loads are to be considered in order to measure total load on the footing:
- Self load of the column x Number of floors
- Self load of beams x Number of floors
- Load of walls coming onto the column
- Total Load on slab (Dead load + Live load)