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D. IS 13920 Seismic Design

Seismic checks per IS 13920:1993 can be performed with the concrete design module in STAAD.Pro (RC Designer). A valid IS456 beam and/or column design must be performed first in order to proceed with the seismic checks as per IS13920.

The following clauses are dealt with in the current version of the RC Designer:

Checks for beam members

In general, the following clauses from IS 13920 have been considered for beam design:

  • Cl. 6.1.1 – The member will be checked to ensure that axial stress does not exceed 0.1 x fck (concrete strength)
  • Cl. 6.1.2 & Cl. 6.1.3 – The program will issue a warning if the dimensions do not satisfy the limits in the code as per the clauses above.
  • Cl.6.1.4 – The program will issue a warning if the depth of the member exceeds ¼ of the span of the member.
  • Cl. 6.2.1 & Cl. 6.2.2 – The longitudinal reinforcement ratios shall be checked as per the limits specified in the clauses above.
  • Cl.6.3 – The shear reinforcement shall be checked for a design shear force as specified in Cl. 6.3. of IS13920.

Checks for column members

In general, the following clauses from IS 13920 have been considered for column design:

  • Cl. 7.1.1 – The member will be checked to ensure that axial stress does not exceed 0.1 x fck (concrete strength)
  • Cl. 7.1.2 & 7.1.3 – The program will issue a warning if the dimensions do not satisfy the limits in the code as per the clauses above.
  • Cl. 7.3 – The program will work out the critical shear force as defined in Cl. 7.3.4 of the code.
  • Cl. 7.4 – The confining reinforcement (shear links) for the critical zones will be checked as per Cl. 7.4 of the code. The program will issue a pass/fail status for the shear links specified within the critical zones of the column. The Earthquake | Reinforcement page will indicate the status as ‘pass’ if the shear link spacing criteria of IS13920 are satisfied within the critical zones. Otherwise the program will indicate a ‘fail’ status.