Wall Rigidity Equations
3000.psi
f' c
Concrete strength = 3000 psi
f' c
57000.
.psi
Ec
ACI 318 Section 8.5.1
psi
KN
E c = 3122 ksi
E c = 21.5251
Elastic Modulus of concrete
2
mm
0.4.E c E v = 1249 ksi
Ev
Shearing Modulus of concrete
t 8.in
KN
Wall thickness
E v = 8.61
P 1.kip
2
Shear load to determine pier stiffness
mm
Concrete Functions:
t .d
A( d )
Area of wall pier
1 . . 3.
I( d )
t d 0.8
Assume stiffness = 80% of I per FEMA 273
12
Sec. 6.8.2.2
3
( 1.2.P.h )
P.h
∆ c( h ,d )
Deflection of a cantilevered pier
A( d ) .E v
3.E c .I( d )
3
( 1.2.P.h )
P.h
∆ f( h ,d )
A( d ) .E v
12.E c .I( d )
Deflection of a fixed-fixed pier
1
R f( h ,d )
Rigidity of fixed wall pier
∆ f( h ,d )
Shear Walls 7A-7C and 7G-7I:
1 foot = 0.305m
H3-22
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