What is characteristic strength and terget mean strength ? Relation between both ?

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Characteristic strength is the strength of a material below which not more than a specified proportion of test results are expected to fall. Target mean strength is the strength that a structure is designed to achieve.

Characteristic strength is a statistical value representing the lower tail of the strength distribution of a material.
Target mean strength is the strength that a structure is designed to achieve based on safety factors and design codes.
The relation between characteristic strength and target mean strength is that the target mean strength is typically set higher than the characteristic strength to ensure the safety and reliability of the structure.
For example, if the characteristic strength of a concrete mix is 30 MPa, the target mean strength for design purposes may be set at 35 MPa to account for uncertainties and variations in material properties.

What is characteristic strength and terget mean strength ? Relation between both ?

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