Base plate & anchors

A pinned column base: bearing of the plate on the grout by the effective-area method, the cast-in anchor group in uplift — steel, pull-out and concrete cone — and the base in shear, drawn in plan.

FREE · NO SIGN-UP v1.0.0 · verified against 12 reference cases

INPUTkN · mm · pinned base

1 · Column and plate

Column Plate steel

b_p [mm] along flanges h_p [mm] along depth t_p [mm]

2 · Design forces

N_Ed [kN] compression +, uplift − V_Ed [kN]

3 · Foundation Concrete

Block B [mm] Block L [mm] Depth [mm]

4 · Anchors cast-in, headed

Size Class

Columns Rows

s_x [mm] s_y [mm]

h_ef [mm] Head d_h [mm] or washer plate

Concrete Threads ψ_re,N

5 · Factors recommended — check the National Annex

γ_c α_cc β_j

Results update as you type. For a base that resists moment, the equivalent T-stubs of EN 1993-1-8 6.2.8 are needed — not covered here.

PLAN · EFFECTIVE AREA · ANCHORS

Free with an account · Sign in

HOW IT'S CALCULATED · WITH YOUR NUMBERS

Step by step, with your numbers

01
Equilibrium████ ██ ███████ · ██████ = ██.██
02
Reactions████ ██ ███████ · ██████ = ██.██
03
Shear force████ ██ ███████ · ██████ = ██.██
04
Bending moment████ ██ ███████ · ██████ = ██.██
05
Deflection████ ██ ███████ · ██████ = ██.██
06
Stress████ ██ ███████ · ██████ = ██.██

FREE ACCOUNT Sign in to see the step-by-step working. A free account takes a minute — no card needed.

Create a free account Sign in

EN 1993-1-8 6.2.2 and 6.2.5; EN 1992-1-1 6.7; EN 1992-4 7.2.1 (headed anchors), recommended values.

ASSUMPTIONS & LIMITS

Pinned base: axial force and shear only. Moment-resisting bases are not covered.
Grout of adequate strength and thickness, so β_j = 2/3 applies (EN 1993-1-8 6.2.5(7)); the plate is centred on the block.
Cast-in headed anchors per EN 1992-4; splitting is assumed prevented by edge distances and reinforcement (7.2.1.7). Post-installed anchors need the values of their European Technical Assessment.
Tension is shared equally between the anchors (concentric uplift).
Plate f_y is the EN 10025-2 minimum for its thickness — at or below the simplified EN 1993-1-1 Table 3.1 value.
Recommended partial factors: γ_c = 1.5, α_cc = 1.0, γ_M0 = 1.0, γ_M2 = 1.25, γ_Mc = 1.5 — check the National Annex.

DISCLAIMER · For education and preliminary sizing only. Results must be reviewed by a qualified engineer before use in design.

BEYOND A PINNED BASE

Moment bases, post-installed anchors to their ETA and FE of the plate — we design the whole joint.

Submit a Problem →

More calculators

AVAILABLE · YOU ARE HEREBase plate & anchors AVAILABLEBeam calculator AVAILABLECentre of gravity & support reactions AVAILABLEColumn buckling