Wood Beam (ASD) (version 98) — Floor Joist
Created with ClearCalcs.com
Client:
Kate
Date:
Jun 25, 2021
Author:
Mirko Restovic
Job #:
002-2021
Project:
Kate and Craig Fawcett
Subject:
B1 (Calculation Group 1)
References:
NDS 2018 (ASD)
Summary
Design Conditions
M = 2190 lb ⋅ ft
Allowable Bending Moment
13%
Allowable Shear
V ′ = 1970 lb
7%
Allowable Bearing Load
R′ = 3810 lb
4%
Governing Live / Short-Term
Combinations
Cross-Sectional Area
Strong Axis Moment of Inertia
Section Modulus
Critical Live / Short-Term
(L/)ST = 9340
Deflection Ratio
δ LT = −0.0105 in
Governing Long-Term Deflection
Governing Simplified DL+LL
Critical Simplified DL+LL Deflection
Ratio
I xx = 178 in 4
S = 31.6 in 3
F b = 1600 psi
Base Allowable Shear Stress
F v = 175 psi
Allowable Stress
δ DL+LL = −0.012 in
Deflection
A = 16.9 in 2
Base Allowable Bending Stress
Base Perpendicular Compression
(L/)LT = 8020
Critical Long-Term Deflection Ratio
International Building
Code (IBC) 2018
Member Properties
δ ST = −0.00899 in
Deflection
3%
Design Code for Load
′
20%
3%
PASS
Base Modulus of Elasticity
F c⊥ = 565 psi
E = 1 800 000 psi
Elastic Modulus (NDS 2018 2.3)
(L/)DL+LL = 7020
Adjusted Modulus of Elasticity
E ′ = 1 800 000 psi
Section Bending (NDS 2018 2.3)
Reactions:
Size Factor
Incising Factor
Bearing: 6 in
FactMax: 248 lb
FactMin: 36.9 lb
D: 61.6 lb
L: 187 lb
0.0
Bearing: 4.5 in
FactMax: 248 lb
FactMin: 36.9 lb
D: 61.6 lb
L: 187 lb
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Distance from Left of Beam (ft)
Ci,b = 1
Positive Bending (NDS 2018 2.3)
Governing Duration Factor Positive Bending
Governing Beam Stability Factor Positive Bending
Adjusted Bending Strength -
Key Properties
CF ,b = 1
Positive Bending
+
CD,b
= 1
CL+ = 0.452
F b′+ = 831 psi
Negative Bending (NDS 2018 2.3)
Primary Loading
Governing Duration Factor Negative Bending
d=11.3 in
Governing Beam Stability Factor Negative Bending
Adjusted Bending Strength Negative Bending
b=1.5 in
−
CD,b
= 0.9
CL− = 1
F b′− = 1660 psi
Shear Design (NDS 2018 3.4)
Member
2x12 SYP SS
LX = 7 ft
Beam Plan Length
Continuous Bracing for Lateral
Torsional Buckling
Bottom braced
Loads
Governing Duration Factor
CD = 1
Adjusted Shear Strength
F v′ = 175 psi
Bearing (NDS 2018 3.10)
Base Bearing Strength
′
F c⊥
/Cb = 565 psi
Comments
D: 13.3 plf
L: 53.3 plf
7 ft
Floor Load
LW: 1.33 ft | D: 10 psf, L: 40 psf
0
0.0
D: 4.26 plf
7 ft
Self-weight
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Distance from Left of Beam (ft)
1