Earthquake Loads
Seismic Site Classification
=
E
Ss (0.2s spectral response acceleration)
=
0.43
S1 (1s spectral response acceleration)
=
0.118
Fa
=
1.7
(Table 11.4-1,ASCE 7-16)
Fv
=
3.2
(Table 11.4-2,ASCE 7-16)
Importance Factor
=
1.25
(Table 1.5-2,ASCE 7-16)
Response modification factor
=
3.5
(Table 12.2-1,ASCE 7-16)
MCE spectral response acceeleration parameter for 5% damping for short period ,
SMS
=
=
Fa x Ss
0.731
MCE spectral response acceeleration parameter for 5% damping for 1s
SM1
=
=
Fv x S1
0.3776
Design of Spectral Acceleration Parameter
Sds
=
=
Sd1
=
2
3
0.487333
x SMS
=
2
3
0.251733
Risk category
=
A
(Table 11.6-1&2,ASCE 7-16)
Ct
=
0.0724
(Table 12.8-1&2),ASCE 7-16)
x
=
0.8
(Table 11.6-1&2,ASCE 7-16)
Height of a structure
Fundamental Time per preiod
=
2.26
mm
=
=
Ct x h²n
0.14
sec
Ta
Seismic Base Shear
x SM1
(CL.12.8.1.1,ASCE 7-16)
V
Seismic Response coefficient
Cs
Cs
Therefore ,Seismic Base Shear
=
CsW
=
Sds
(R/I)
=
0.17
=
Sd1
Tx(R/I)
=
0.646781
=
0.17