Good afternoon, dear guests and subscribers of the "Build for Myself" channel!
A very unusual topic for my channel, but I would like to point out this amazing fact.
So that each reader can understand how the comparison will be made, I will briefly explain that each body has its own weight. And in order to calculate the load created by the body or the pressure on the ground, we need to calculate the weight per unit area.
House
As for any structure, including our house, in order to avoid deformation of the structure, always the first a foundation is laid with a preliminary calculation of its support zone on the ground based on the weight of the structure and the bearing capacity soil.
Ultimately, we get the pressure value, which is expressed in kilograms per square centimeter or kg / sq. cm. And below, I will compare the pressure from a house and the pressure from a person's weight on the ground.
The calculation in itself is simple and consists in collecting (summing up) all existing loads from parts of the house to the foundation, namely from floor slabs, from walls, from a roof, etc. In order not to overload the article, I will try to simplify as much as possible the "construction-mathematical" calculations...
When calculating, builders operate with a section of the wall equal to one running meter. If you have encountered construction, then the illustration will probably be familiar to you:
Now, closer to comparison
As an example for the article, I will consider a one-story brick house with a wall thickness of 1.5 bricks. Obviously, I do not take light houses from aerated concrete, from a bar or frame frames, I will explain further why.
As you can imagine, the size of the house for comparison does not matter, since with an increase in its length or width, the foundation itself increases, and the load per linear meter will always remain constant.
Directly, the collection of loads and the calculation itself: The height of the wall of the floor is 3 m, the thickness of the wall is 1.5 bricks or 38 cm, therefore the volume of brickwork per 1 running meter is 0.38 * 3 * 1 = 1.14 cubic meters. The specific gravity of 1 cube of brickwork according to construction reference books is approximately 1500 kg, respectively, the weight of a section of a wall 3 meters high is 1.14 * 1500 kg. = 1700 kg.
Now, we need a load from the roof. We take an ordinary metal roof and taking into account both snow and wind loads, as well as loads from the attic floor and rafter system - the weight per 1 linear meter is about 450 kg.
Next, add a plinth and a strip foundation made of concrete 1.5 m deep and at least as thick as the wall. Let's take the thickness for 40 cm, which is about 1300 kg, so we have all the loads per 1 running meter and we can add them:
1700 + 450 + 1300 = 3450 kg.
Thus, we obtain that 1 r.m. crushes at home weighing 3450 kg. on the ground by means of a foundation that distributes this load along the base with its support area equal to 40 cm. * 100 cm. = 4000 sq. Cm. Therefore, the soil is under pressure from the house 3450/4000 = 0.86 kg / cm 2, i.e. just under one kg. per 1 sq. cm.
Fuh :-))), it was found out, it's much easier with a person ...
As for a person, here we take his weight, for simplicity of calculation - 100 kg., And both soles of his shoes are size 43, with an area of 126 sq. Cm. each, i.e. 2 soles = 252 cm2
We calculate the pressure from a person to the ground: 100/252 = 0.4 kg / cm 2.
We can compare :-)))
One-story brick house - 0.86 kg / sq. Cm. and a 100 kg human body - 0.4 kg / cm 2.
As you can see, the difference is only two times, but from the outside it seems that the difference should be at least hundreds of times! And if the house is made of aerated concrete, frame or log? If so, then the soil under the feet of a person will experience a much stronger load than from such houses. Therefore, everything in the world is relative ...
If you liked the article, I will be very happy!!! Thanks!
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