Tensile strength of concrete is a very important parameter that is taken into consideration during construction. It can have a significant impact on the other flexural strengths of the structural element, as it represents approximately 10% of the concrete's compressive strength.
In this article we focus on the background and methods for evaluating the tensile strength of concrete.
What is the tensile strength of concrete?
Concrete element subjected to pure tensile efforts or combined compression and tension efforts. A concrete pillar used to support a floor can be considered an example of pure tensile stress.
A concrete beam subjected to flexural stresses will have tensile and compressive stresses in the same section. However, the tensile strength of concrete receives little consideration in flexural design, as the section can crack and lose the stiffness provided by the tensile strength of the concrete.
However, in prestressed designs, tensile strength is taken into consideration in the design. A certain value of the tensile strength of concrete is included in the construction.
Why is the tensile strength of concrete important?
As discussed above, we consider tensile strength in the design to make the most of concrete. If we take this into consideration, it is a rather large value that can contribute to the design.
However, in most cases we cannot take tensile strength into account because if a crack occurs, the rigidity guaranteed by tensile strength is lost.
When designing prestressed and prestressed beams, we consider tensile strength to improve load capacity. According to BS 8110 there are three strength classes for prestressed structures.
The following table shows the allowable tensile stresses taking into account the formation of cracks in concrete. Tolerances are taken into account Durability of concrete for.
Furthermore, tensile strength represents the dominant factor in crack control. Tensile strength is one of the important factors that can help prevent cracking.
How do you determine the tensile strength of concrete?
There is an empirical method proposed by several researchers to determine tensile strength and the values to be taken into account in the project.
In this article we will focus on the values specified in the different standards.
- BS 8110 Part 01 1997
The code specifies tensile strength criteria for tendons and tendons.
- Eurocode 2
Table 3.1 shows the tensile strength of concrete for each type of concrete. An equation for calculation depending on compressive strength is also provided.
Here, f ck denotes the thickness of the cylinder, f ck denotes the thickness of the cube, and f CTM refers to the tensile strength of the concrete.
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