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: 3 of 6
DESIGN OF CONCRETE BEAMS - Horizontal Steel ACI 318-2002
PROJECT: San Luis
Structure
COMPUTED BY: LLM
INPUT VALUES
fc = 4500 psi b =
fy = 60000 psi D =
Es = 29000 ksi dcvr =
MEMBER I.D.: Channel Wall
MEMBER LOCATION: Point a
Date: 12/21/2015
12 in
12 in
2 in
Mo = 3.77 k -ft :Unfactored Moment
Mu = 6.03 k -ft :Ref. ACI 350.9.2.8
for environmental durability factor
CALCULATED VALUES (see ACI 318-02 Section 10.5 for Asmi,,)
Ec =
3865 ksi
n =
7.5
d =
9.6875 in
B, =
0.83
Pmin(MOR)=
0.0018 Asmin= 0.21 in` (max of 2 eqns)
Pmm(ACI) =
0.0018
Pmax =
0.0197 Asmax= 2.293 in
Pbai =
0.0311
Preq =
0.0012 Asreq = 0.14 in
z
Calculated
Quadratic Coefficients
a 39333.33
b -581250
c 80400
QTY
SIZE
Area
As pro
1
#4
0.20
0.20
1
#5
0.31
0.31
1
#6
0.44
0.44
1
#7
0.60
0.60
1
#8
0.79
0.79
1
#9
1.00
1.00
1
#10
1.27
1.27
0.04 Pbai
(1.33*Asfeq) = 0.19 in` Asmin= 0.19 in (min of Asmin or 1.33*ASreq)
----------> Minimum steel controls -Use Asmin or provide 1.33(Asreq) per ACI 10.5
REBAR SPACING
ACI 318-02 Crack Control Provisions
INPUT --- > Selected Bar Size #5
Qty of bars used = 1
Area of bar = 0.31 in`
Clear Cover = 2.00 in
Aspro = 0.31 in`
P = 0.3%
Mo = 3.77 k -ft
k = 0.181
j = 0.9397 in
fs = 16.0 ksi
S = 12 in
smax = 27 in
Use #5@12 in 12 inch deep beam.
CRACK CONTROL
Acomp = 55.50 int
Alt. Design Method
Maximum z Values
Exp.
Beam Slab
Int.
175 155
Ext.
145 129
Normal Severe
Env/Hydl
115 1 95
ACI 318
80.9
ACI 3501
80.9
Normal: pH<5, Soluble sulfates<1000 ppm