Joints Diagonal Compression (NTC-18)

The diagonal compression induced in the joint by the diagonal strut mechanism shall not exceed the compressive strength of concrete in the presence of transverse tensile strains. NTC-18 indicates the following expression for the calculation of the joints’ diagonal compression capacity:

For the definition of the quantities in the expression above you may refer to section C8.7.2.3.5 of the commentary of NTC-18.