How is the direction of the seismic load defined?

  • Information
  • Software
    Advance Design
  • Module
    Advance Design - General
  • Version
    > 2010 SP2
  • Type
  • Difficulty

In Advance Design the definition of a quake is made on two main orthogonal directions but sometimes it is necessary to load a structure from seismic loads acting on different directions.

The seismic load acting on any direction is defined by creating load combinations each having the two main seismic load cases acting concomitant reduced with a calculated coefficient corresponding to the desired direction.

For example a seismic load case acting at the +45°, -45°, +135° and -135° angles from the main axis x-x, the combination coefficients will be calculated by decomposing the vector equal with the value 1 by the two main directions.

How is the direction of the seismic load defined

By modifying the load case coefficients in the combination, we can simulate a seismic load case acting on any direction.