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Code Name
Issued by

Ministry of Public Works and Settlement

Revision

Specifications for structures to be built in disaster areas 1975
Draft form 1997
Specification for Buildings to be Built in Seismic Zones (2007)

Horizontal Base Shear


Vt : Horizontal Seismic Base Shear (see Fig. 2)

 A(T1) : Spectral Acceleration Coefficient 

A (T) = AO I S (T) 
A0 : Effective Ground Acceleration Coefficient 
        from Table 1
I : Building Importance Factor from Table 2

S (T) : Spectrum Coefficient (see Fig. 1)

0 < T < TA           S (T) = 1 + 1.5 T/TA

TA T TB             S (T) = 2.5

T > TB                  S (T) = 2.5 (TB /T)0.8

           TA & TB : given by Table 3
          
If the equivalent seismic load method is applied,
S (T) > or = 0.7.

Ra : Seismic Load Reduction Factor 

              0 < T < TA             Ra = 1.5 + (R - 1.5) T/T A 

              T > TA                  Ra = R 

              R : Structural Behavior Factor from Table 4

W : Total weight of the building

wi : weight at level i, w i = g i + n q i
gi : total dead load at level i
qi : total live load at level i
n : live load reduction factor from Table 5

Lateral force distribution along the height 

Lateral force to i-th story : 

   

where
                

                

               lateral force at N-th story = FN + Fi

               hi : height from the base of the building at i-th story