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: 5 of 10
DESIGN OF CONCRETE BEAMS - Horizontal Steel ACI 318-2002
PROJECT: San Luis
Structure
COMPUTED BY: LLM
INPUT VALUES
f = 4500 psi b =
fy = 60000 psi D =
Es = 29000 ksi dcvr =
MEMBER I.D.: Tall Energy Dissipator Wall
MEMBER LOCATION: Point a
Date: 12/18/2015
12 in
15 in
2 in
Mo = 51.1 k -ft :Unfactored Moment
Mu = 81.9 k -ft :Ref. ACI 350.9.2.8
for environmental durability factor
CALCULATED VALUES (see ACI 318-02 Section 10.5 for Asm,n)
Ec =
3865 ksi
n =
7.5
d =
12.436 in
B, =
0.83
Pmm(MOR)=
0.0018 Asm,,,= 0.27 in` (max of 2 eqns)
PmMAc> =
0.0018
Pmax =
0.0197 Asmax= 2.944 in`
Pbal =
0.0311
Preq =
0.0107 Asreq = 1.60 in z
Calculated
Quadratic Coefficients
a 39333.33
b -746160
c 1092000
QTY
SIZE
Area
As pro
8
#4
0.20
1.60
6
#5
0.31
1.86
4
#6
0.44
1.76
3
#7
0.60
1.80
3
#8
0.79
2.37
2
#9
1.00
2.00
2
#10
1.27
2.54
0.34 Pbal
(1.33*ASreq) = 2.13 in Asm;,,= 0.27 in (min of Asm;n or 1.33*Asreq)
----------> OK - Use Asreq
REBAR SPACING
ACI 318-02 Crack Control Provisions
INPUT --- > Selected Bar Size #9
Qty of bars used = 2
Calced Area of bar = 1 in
Values Clear Cover = 2.00 in
Aspro = 2 in"
P= 1.3%
Mo = 51.1 k -ft
k = 0.359
j = 0.8803 in
fs = 28.0 ksi
S = 6 in
Smax = 14 in
Use #9@6 in 15 inch deep beam.
CRACK CONTROL
Acomp = 30.77 int
Alt. Design Method
Maximum z Values
Exp.
Beam Slab
Int.
175 155
Ext.
145 129
Normal Severe
Env/Hyd
115 95
ACI 318
120.1
ACI 350
124.5
Normal: pH<5, Soluble sulfates<1000 ppm