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D. DIN 1045-1 Column Design Principles

The DIN 1045 Column Design Brief is for prismatic, rectangular solid or circular shaped members.  Members may be built up from multiple elements, but only the member end moments are considered, so only single height columns are recommended.

Design Principles

Columns are designed for axial force and biaxial end moments, as well as biaxial shear.  Torsional moments are also included if specified in the design brief.  Reinforcement is provided by the program based on the forces generated in the Analysis mode and the code clauses outlined below.

The main reinforcing bars may be modified to allow for other bars passing through the section and then re-checked to ensure that the design requirements are satisfied.

All selected load combinations are used to calculate the required reinforcement.  The combination which produces the maximum required reinforcement area is called the 'Guiding Load Case', and the bar arrangement is chosen based on that combination.  Detailed printout of the design calculations is also for that combination.

The main reinforcing bars may be modified to allow for other bars passing through the section and then re-checked to ensure that the design requirements are satisfied.

Check for slenderness

Slenderness is considered for both axis. A Column is considered if it satisfies 8.6.3.2

Critical slenderness is calculated as in 8.6.3.4

Calculation of design moment

Total eccentricity is calculated as in 8.6.5.5

e2 , eccentricity is calculated as in 8.6.5.7

ea , the additional accidental eccentricity is calculated as in 8.6.4

The minimum eccentricity is calculated as in 8.6.3.9

For slender column e0, design first order eccentricity is in accordance with 8.6.5.6

Reinforcement limits

Maximum % of steel is calculated in accordance with 13.5.2.2

Minimum % of steel is calculated in accordance with 13.5.2.1

The shear reinforcement design in column is calculated in accordance with 10.3

The link spacing is in accordance with 13.5.3.4