I believe we can calculate the load from the slabs S1 and S2 to the beam AB by getting the area of the two trapezoidal portions which is 2 Nos x 1/2 x (5+2) x 1.5 = 10.5 m2. We then multiplied the total area of 10.5 m2 x 8.75 kN/m2 and you get a total load of 91.875 kN to be carried by the beam AB. However using the UDL method (?) as you did we get a sum of 23.12 kN/m which when multipled by the length of the beam, we get a higher value of 115 kN. Further to this, we must add the Wall Loads to the beam, the self-weight of the Beam and then add the factor to be able to truely use this information in day to day job. Please go through that difference between the UDL and the area method. I have done this with another example, again the area method (which is nearer to Etabs calculation and result) has a lower value when doing the UDL.
the value of 91.875KN will still be a trapezoidal load on beam AB. The formula of converting trapezoidal load to equivalent UDL is given in Reynolds'' Reinforced Concrete handbook and that's what Pritesh Bhana has described. I understand that apart from loads from slab you are supposed to add beam self weight and wall loads if any, but the emphasis from the author is on converting trapezoidal load to equivalent udl
For the sake of this explanation, he did not went that far as to factor the loading. Furthermore this is the basic know-how explaination, the theoretical aspect behind the design. As you go from country to country, they use different factor and load combinations.
I believe we can calculate the load from the slabs S1 and S2 to the beam AB by getting the area of the two trapezoidal portions which is 2 Nos x 1/2 x (5+2) x 1.5 = 10.5 m2. We then multiplied the total area of 10.5 m2 x 8.75 kN/m2 and you get a total load of 91.875 kN to be carried by the beam AB. However using the UDL method (?) as you did we get a sum of 23.12 kN/m which when multipled by the length of the beam, we get a higher value of 115 kN. Further to this, we must add the Wall Loads to the beam, the self-weight of the Beam and then add the factor to be able to truely use this information in day to day job. Please go through that difference between the UDL and the area method. I have done this with another example, again the area method (which is nearer to Etabs calculation and result) has a lower value when doing the UDL.
the value of 91.875KN will still be a trapezoidal load on beam AB. The formula of converting trapezoidal load to equivalent UDL is given in Reynolds'' Reinforced Concrete handbook and that's what Pritesh Bhana has described. I understand that apart from loads from slab you are supposed to add beam self weight and wall loads if any, but the emphasis from the author is on converting trapezoidal load to equivalent udl
good and perfect!
for one way slab ( bigger or equal 2 )sir
Trapezoidal area ABCD that means one rectangular load+two triangular load =one UDL load+two UVL load?
I am right sir?
Good
Thank u so much
sir please include in plan how can find BENDING MOMENT SHEAR FORCE
Factory of safety 1.5 ??u didn't multiply why sir??
For the sake of this explanation, he did not went that far as to factor the loading. Furthermore this is the basic know-how explaination, the theoretical aspect behind the design. As you go from country to country, they use different factor and load combinations.
9:08
where is this 1.67 came from?
ratio of long and short sides.