2017-02-21_REVISION - M1988112 ‎(2)‎

• Permit No: M1988112
• IBM Index Class Name: Revision
• Doc Date: 2/21/2017
• Doc Name: Request for Technical Revision
• From: Battle Mountain Resources, Inc.
• To: DRMS
• Type & Sequence: TR34
• Email Name: WHE
• Media Type: D
• Archive: No

Page: 4 of 8
DESIGN OF CONCRETE BEAMS - Horizontal Steel ACI 318-2002
PROJECT: San Luis
Structure
COMPUTED BY: LLM
INPUT VALUES
fc = 4500 psi
fy = 60000 psi
Es = 29000 ksi
MEMBER I.D.: Short Energy Dissipator Wall
MEMBER LOCATION: Point a
Date: 12/18/2015
b = 12 in
D = 12 in
dcvr = 2 in
Mo = 28.1 k -ft :Unfactored Moment
Mu = 44.9 k -ft :Ref. ACI 350.9.2.8
for environmental durability factor
CALCULATED VALUES = (see ACI 318-02 Section 10.5 for Asmin)
Ec =
3865 ksi
n =
7.5
d =
9.5 in
B, =
0.83
P-NMOR) =
0.0034 Asmm= 0.38 in` (max of 2 eqns)
pm,,,(Aa) =
0.0034
Pmax =
0.0197 Asmax= 2.249 in
Pba) =
0.0311
Preq = 0.0100 Asreq = 1.14 in z
0.32 Pbai
(1.33`Asfeq) = 1.52 in`
----------> OK - Use Asreq
REBAR SPACING
ACI 318-02 Crack Control Provisions
INPUT --- > Selected Bar Size #8
Qty of bars used = 2
Area of bar = 0.79 int
Clear Cover = 2.00 in
Asp, = 1.58 in`
P = 1.4%
Mo = 28.1 k -ft
k = 0.3638
j = 0.8787 in
fs = 25.6 ksi
S = 6 in
Smax = 16 in
Use #8@6 in 12 inch deep beam.
Calculated
Quadratic Coefficients
a 39333.33
b -570000
c 598666.7
QTY
SIZE
Area
As pro
6
#4
0.20
1.20
4
#5
0.31
1.24
3
#6
0.44
1.32
2
#7
0.60
1.20
2
#8
0.79
1.58
2
#9
1.00
2.00
1
#10
1.27
1.27
ASmm= 0.38 in (min of ASmin or 1.33*Asreq)
CRACK CONTROL
Acomp = 30.00 int
Alt. Design Method
Maximum z Values
Exp.
Beam Slab
Int.
175 155
Ext.
145 129
Normal Severe
Env/Hyd
115 95
ACI 318
107.8
ACI 350
107.8
Normal: pH<5, Soluble sulfates<1000 ppm