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Stiffness coefficients

The stiffness coefficients for basic joint components are defined by the EN 1993-1-8 Article 6.3.2 Table 6.11.

The usage of stiffness coefficients for basic joint components in the steel connections is defined by the EN 1993-1-8 Article 6.3.1 Table 6.9 and 6.10. In SCIA Engineer these stiffness coefficients are used:

For a bolted beam-to-column connection, the following coefficients are used :

For a bolted splice connection, the following coefficients are used :

For a bolted column base connection, the following coefficients are used :

The stiffness coefficient for concrete in compression component k₁₃ is calculated as:

with:

The elastic modulus of concrete E_c and also f_cm is calculated EN 1992-1-1 Article 3.1.3, Table 3.1 as:

The effective bearing width and length of the compression flange are calculated according to EN 1993-1-8 Article 6.3.2, Table 6.11, Note 1.

with:

Since the Lb* formula for detection of prying forces is valid only for 2 bolts per row, the case identification for calculation of stiffness coefficients k15 and k16 is not possible. From this reason, in case 4 bolt in a row, the formula giving smaller stiffness coefficient value is used for stiffness coefficients k15 and k16 separately.

For a welded beam-to-column connection, the following coefficients are used :

When a column minor axis configuration is used, the values for k1 and k2 are replaced by k_i, the stiffness coefficient in the tension or the compression zone of the column web in bending and punching. The value for k_i is given by (see Ref.[21]) :

with:

The factor k_rot is equal to 1 if the rotation of the column flanges restrained

A welded splice connection is considered as rigid.

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