Type of connection: Column base
Unit system: Metric
Designed acc. to: EN 1993-1-8 and EN 1992-1-1
Investigated: Concrete in compression
Steel: Grade S235
Bolts: M20 Grade 4.6
Concrete: C20/25
Geometry
Pinned column base is designed for the column HEB 300. The base plate has dimensions 460×460 mm. Anchor bolts are M20 4.6 placed inside the column boundary to reduce the stiffness of the joint. The base plate is grouted with the expected thickness of 30 mm.
Applied load
The column is loaded by compressive force 2 000 kN.
Manual calculation
General
Three components are examined: column flange and web in compression, concrete in compression including grout, welds. All components are designed according to EN 1993-1-8 and EN 1992-1-1. In this example, only equivalent T-stub in compression according to EN 1993-1-8 – Cl. 6.2.5 is investigated.
Elastoplastic behavior of the base plate is expected in the code. The uniform compressive stress under the effective area of the base plate equal to design bearing strength of the concrete increased by triaxial stress state, fjd, is estimated at the design compressive resistance of the joint. The effective area Aeff is constructed using additional bearing width, c. This value is calculated using following formula:
\[ c=t\sqrt{\frac{f_y}{3f_{jd} \gamma_{M0}}} \]
where:
