Following popular requests, in Tekla Structural Designer 2020 the Wind Wizard for the Indian Head Code has been fully revised and updated to the new IS 875 (Part 3) : 2015 (incorporating amdt. no.1 April, 2016).

• The new 2015 code year option is selected in the Design Codes > Action Codes settings as shown in the picture above.

• With this selected the Wind Wizard determined pressures are calculated considering all the relevant and newly introduced design factors of the 2015 code version.

• The update allows cyclonic design effects to be considered for structures situated on the Indian east and west coasts (Gujarat coastal region).

• Key aspects of the Wind code update are:

  • Classification of building class (A, B and C) based on structure’s greatest horizontal or vertical dimension (exposed to wind) as per Cl.5.3.2.2 (of IS 875 (Part 3) - 1987 (reaff.2003) has been omitted in the new code.

  • A new importance factor for cyclonic region k4 (Clause 6.3.4) is introduced for the wind pressure determination.

  • For the design wind pressure determination the following new factors are introduced:

    • Kd - wind directionality factor (Clause 7.2.1)

    • Ka - area averaging factor (Clause 7.2.2)

    • Kc - combination factor (Clause 7.3.3.13)

  • Design wind speed is now (Vz) = Vb x k1 x k2 x k3 x k4; wind pressure pz = 0.6 x Vz2 and design wind pressure (Pd) = Kd x Ka x Kc x pz

  • Certain values in the table for pressure coefficient, figures for factors associated with cliff and escarpment and ridge and hill topography have been updated.