SmartBeam Composite Castellated Beam Design
SmartBeam Composite Castellated Beam Design
SmartBeam Composite Castellated Beam Design
INTRODUCTION:
CONSTRUCTION BRIDGING:
This program will assist in sizing simply supported , composite castellated beams with point and uniformly
distributed loads. All areas shaded yellow or with a drop box require input information. Contact CMC Steel
Products toll free at (877) 764-2326 for furher information or assistance.
Construction bridging is required for castellated beams only when one or both ends are either seated or bearing. OSHA
requires construction bridging to be installed to meet the following loading conditions:
1. A 300 lb. man at midspan. This condition requires bolted X-bridging to be installed before the hoisting cables are
removed.
2. One 4,000 lb. bundle of deck to be placed over three beams no further than 1'-0" from the end of the beam. This
condition requires horizontal bridging to be in place before deck bundles are placed.
HOW TO SPECIFY:
Castellated beams can be specified in one of the following methods:
1. Direct Specification:
When using direct specification the beam is specified in the same manner as a wide flange beam. For example,
CB27x40, CB stands for Castellated Beam, nominally 27 inches deep weighing 40 pounds per foot. In
composite construction, significant weight savings can be achieved by using a heavier tee section on the
bottom and a lighter section on the top. This is known as an assymetric section. An example of this
specification is CB27x35/46. As before, CB stands for Castellated Beam, nominally 27 inches deep. The
beam is manufactured from a 35 pound per foot beam on top and a 46 pound per foot on bottom. Several
common assymetric sections can be selected in the design program. In order to accommodate production
processes, CMC Steel Products may from time to time provide an equivolent symetrical size.
2. Performance Specification:
A performance specification is the best way to insure the beam is designed as efficiently as possible.
An example of a perfomance specification is: CB27(1100/560/500). CB stands for Castellated Beam,
nominally 27 inches deep, (Total Load/Live Load/Precomposite Dead Load). CMC Steel Products will
provide the most efficient shape (symetric or assymetric) to support specified loadings.
USE OF PROGRAM:
1. Enter job name and design mark (not required).
2. Enter the beam configuration: span (110'-0" max), spacing (left & right), material strength (36 or 50), and
connection type. If beams longer than 110' are needed please call CMC Steel Products for availability.
3. Enter concrete properties (strength, weight, & thickness), deck properties (height & width), and stud
properties (diameter, number/rib, & length), and percent composite.
4. Enter loading. Program allows (1) uniform live load, (1) uniform dead load, and up to (4) point loads. In order
to verify the adequacy of the pre-composite beam, the percent present before the concrete has hardened
should be entered as well. The four point loads should be entered starting with P1 and ending with P4.
5. Press Stnd. Geom. button. This enters the standard castellation pattern corresponding to the given
castellated beam.
6. Choose a trial castellated beam. If all interaction values shown on the screen are less than 1.000, the beam
is OK.
NOMENCLATURE:
OPTIMIZATION:
All of the failure modes and their corresponding interaction values are shown in the results section. All values
must be less than or equal to 1.000 for the beam to be OK. Press the "Find Lightest Shape" button to have
the program select the lightest shape with a standard castellation pattern. Significant strength improvements
can be achieved by modifying the castellation pattern. The following guidelines will help in the optimization.
1. To increase shear or web post strength, increase "e".
2. To increase bending strength, decrease "e".
3. If point loads are a significant portion of the load, increase "dt".
***You can return to standard geometry by pressing the "Stnd. Geom." button***
SmartBeamTM
Composite Castellated Design Program
50
50
16.011
Duct W x H
9.000 in
LOADING INFORMATION
Uniform Distributed Loads
Sample Project
CB1
60.000
ft
10.000
ft
10.000
ft
plf
plf
Pre-comp %
Pre-comp %
0%
80%
50.5
10.995
18.450
2181.22
2433.52
plf
in^2
in^2
in^4
in^4
125.62
in^3
145.73
in^3
Live Load
Dead Load
500
650
Load #
Magnitude
Dist from
Percent DL
ksi
(#)
(kips)
(%)
in
P1
0.00
0.00
0%
0%
Sx gross
P2
0.00
0.00
0%
0%
rx min
11.48
in
P3
0.00
0.00
0%
0%
Iy
25.61
in^4
0.00
0.00
0%
0%
Sy
7.88
in^3
16.185 in
Percent
Pre-Comp. Sx net
Castellated Beam
CB30X44/57
W21X44
W21X57
20.66
21.06
bf
6.5
6.555
tf
0.45
0.65
3500
tw
0.35
0.405
150
3
6
100%
composite %
Stud Spacing:
CASTELLATION PARAMETERS:
e
b
8.000
5.500
in
in
dt
S
dg
5.500
27.000
30.720
in
in
in
phi
60.839
deg
ho
19.720
wo
19.000
04/25/2016
Avg. wt.
Anet
Agross
Ix net
Ix gross
P4
COMPOSITE INFORMATION
Shear Studs:
3500 stud dia. (in)
150 stud ht. (in)
3/4"
8.44
0.75 beffec.
120.00
in
Actr
42.665
in^2
N.A. ht.
31.43
In Deck
N=44,Uniformly Dist.
RESULTS
WARNINGS
1 Itr
Ieffec.
Sxconc
Sxsteel
6474.27
6474.27
in^4
in^3
1224.63
205.97
in^3
in^3
CONSTRUCTION BRIDGING
Failure Mode
Interaction
Status
Bending
0.954
<=1.0 OK!!
in
Web Post
0.756
<=1.0 OK!!
in
Shear
0.678
<=1.0 OK!!
39
Concrete
0.398
<=1.0 OK!!
Pre-Comp.
0.791
Overall
0.954
Pre-Composite Deflec.
Live Load Deflection
<=1.0 OK!!
<=1.0 OK!!
2.643''
0.777''
=L/272
=L/927
Double clip