Euro Code 8  [ Back to Seismic Design Code Index ]   [ Back to Country Index ]
Code Name 1994 Eurocode 8: Design provisions for earthquake resistance of structures Part 1-1: General rules – Seismic actions and general requirements for structures.
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Horizontal Base Shear

Fb : Base shear force for simplified modal response spectrum analysis
        
W : Total weight of the building
        
Sd(T)  : design spectrum normalized by the acceleration of gravity g (Fig. 1)

        
T1
: fundamental period of vibration of the building 

        α : ratio of the design ground acceleration to the acceleration of gravity

         q : behavior factor

 for RC structures :

                            q0 : basic value of the behavior factor from table 1

                            kD : factor reflecting the ductility class from table 2

                            kR : factor reflecting the structural regularity in elevation from table 3

                            kW : factor reflecting the prevailing failure mode in structural systems
                                     with walls from table 4

              S, β0, TB, TC & TD : values from table 5
             
kd1 & kd2 : values from table 6