RPA99-2003 Seism family


The RPA99-2003 Seism family is created when the Algerian seismic standard RPA99-2003 is selected for the current project.

RPA99-2003 Seism family properties

RPA99-2003 Seism loads family - Properties



By default, the spectrum corresponds to the current seismic standard, RPA99-2003. To view the standard spectrum: in the seism properties window, Spectrum category > Horizontal spectrum / Vertical spectrum, click . Also, it is possible to define a custom seismic spectrum using the Function editor.


Construction zones map

Regions for RPA99-2003 seism loads family

- the redundancy and the geometry of the constituent elements;

- the regularity in plan and in elevation;

- the quality of the control of construction.

It is calculated with the formula 4-4, according to RPA 99/2003, chapter IV:


Damping correction


To edit the spectrum parameters, the imposed spectrum option must be enabled: in the Family category, from the Spectrum drop-down list, select Imposed.

Mode superposition

Define properties that are taken into account when generating concomitance combinations. See Configuring load cases combinations.



Click a section of the properties window. Notice the bottom area of the window; it displays a short description of the active cell's content.

Accessing the properties

After creating a seism family: in the Project Browser, expand the Loading group and select Seism RPA99-2003.