Program
Notes:
System Requirements:
This program was designed to be run in Internet Explorer only. For download instruction see Microsoft.com.
General Information:
1. Analysis must be re-executed and the graphs must be re-plotted after changing any of the input boxes.
This program requires the following input:
1.
Joist span
2.
SJI Joist Designation
The program accepts the following
loading input:
1.
Up to ten concentrated loads
a.
Magnitudes (lbs)
b.
Locations (ft-in)
2.
Up to five trapezoidal loads
a.
Starting uniform load (plf)
b.
Starting location (ft-in)
c.
Ending uniform load (plf)
d.
Ending location (ft-in)
3.
Up to ten uniform loads
a.
Uniform load is constant (plf)
b.
Starting location (ft-in)
c.
Ending location (ft-in)
The following assumptions must be
valid:
1.
The joist must be laterally stabilized in accordance with the SJI
standards, e.g., attachments are spaced at 36" or less.
2.
Minimum web shear is 25% of the reaction due to the SJI loading.
3. Deflection is calculated using the following assumptions:
a. Prismatic beam behavior
b.
Shear deflection 15%
4.
All concentrated loads are at panel points.
5. If a section of the joist is unloaded for more than 36" a message will be displayed indicating that an unbraced top cord segment may exist and must be evaluated.
The information presented in this program has been prepared in
accordance with generally recognized engineering principles. New Columbia Joist
Company recommends that this information not be used or relied upon for any
purpose without a thorough review by a licensed professional engineer. The user
of this application accepts all responsibility for its accuracy and use. NCJC
assumes no liability for results of the use of this program. By using this
program the user accepts these conditions.