The design compression resistance

the resulting bearing area (The area in compression under the base plate)

the bearing strength of the joint

the thickness of the steel base plate.

the yield strength of the steel base plate material.

bearing area

area not included in bearing area

the joint coefficient, which may be taken as 2/3 (0.667) provided that the characteristic strength of the grout is not less than 0.2 times the characteristic strength of the concrete foundation and the thickness of the grout is not greater than 0.2 times the smallest width of the steel base plate.

This value can be set in the Concrete Basic data.

is the design value of the concrete cylinder compressive strength of the concrete given by:

in which f_ck is the characteristic cylinder compressive strength of the concrete determined in conformity with Ref. [6].

This value can be set in the Concrete data.

γ_c is the partial safety factor for concrete material properties given in Ref. [6]. This value can be set in the Safety factors dialog box.

the concentration factor

where

a & b are the dimensions of the base plate

a₁ & b₁ are the dimensions of the effective area.

See figures.

For a₁ the least of the following should be taken:

• a₁=a+2a_r
• a₁=5a
• a₁=a+h
• a₁=5b₁ but a₁ ≥ a

For b₁ the least of the following should be taken:

• b₁=b+2b_r
• b₁=5b
• b₁=b+h
• b₁=5a₁ but b₁ ≥ b