For the construction and construction of floors of various types, wooden beams are most often used, they have the necessary qualities and affordable cost. It is easy to work with such material, it is well amenable to treatment and protection. In order for the construction to be solid and reliable, it is necessary during the design to carry out the calculation for the entire structure and for the wooden beams in particular.
Schematic of mounting wooden floor beams.
It is necessary to perform calculations, based on exactly which beams will be used, for what purposes, it is required to take into account which loads are planned. For calculations it is required to be guided by special SNiPs, which display all the features and requirements of such works with wooden structures.
A wooden beam can be used for various jobs:
Calculation of a wooden floor beam.
Beams can be classified by the form:
Scheme for calculating wooden floor beams.
When calculating the load on a wooden beam, it is necessary to take into account various parameters, the work is carried out in several stages:
During the calculation, attention is needed to pay attention to what loads are planned. They are classified into the following:
In order to eliminate inaccuracies, experts recommend adding a safety margin of 30-40% to them while accounting for loads. When performing the calculation, it is important to take into account what stiffness limits are set; for this, it is necessary to become familiar with GOST for a specific type of building material. For interfloor wooden beams, this limit is 1/250, and for garret floors - 1/200. It is also necessary to take into account exactly which wood is used for the construction of the beam.
Wooden beams - a durable material, but designed for certain loads. An example of the calculations is given below:
Calculation for collapse of the support sections of the beam.
The resistance of the tree is calculated according to the following formula: Wthreb = Mmax / R.
For pine, the value of Mmax, i.e., the deflection, is equal to 800 / 142.71 = 0.56057 m³. The value of R - is the coefficient of resistance of wood, is determined according to SNiP II 25-80 for wooden structures.
There are already established values for such indicators:
When performing the calculation, design parameters are taken into account. For example, the length of one beam can not be more than 5 m, if the material is used for the device of interfloor overlappings.
It is required to remember that the beam thickness cannot be less than 1/25 of its length.
Regulatory documents are used for the design:
Before building any house where wooden products will be used, it is important to correctly calculate the loads and dimensions of the material. It is recommended to use regulatory data that is specified in SNiPs and GOST. It is in them that one can find all the required data and values, which are necessary for choosing lumber of proper quality and with the necessary parameters.
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