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180
3.7
ENERCALC
Horizontal Plywood Diaphragm
This program provides analysis and design of horizontal rectangular plywood diaphragms
subjected lateral loads from wind or seismic forces.
This program calculates nailing requirements and shear values using UBC Table 23-I-J-1,
including blocked and unblocked diaphragms. For conditions where high diaphragm loads
create shears exceeding those available from the UBC table, you can use the High Load
Plywood Diaphragm program, which uses ICBO Report #1952 for diaphragm design using
23/32" plywood applied according to the reports requirements.
Loads due to diaphragm self weight and lateral loads applied to the diaphragm boundary
are allowed. To analyze diaphragms subjected to wind loads only, specify diaphragm
weight as zero and seismic factor as 1".
Up to four partial or full length uniform loads can be applied to the diaphragm boundary
in both the North-South or East-West direction. The partial length ability allows you to
model seismic wall weight or wind loads on portions of the building with different
tributary areas.
The program calculates total shear and unit shear for each of the four sides of the
diaphragm, chord forces at 1/4 points, and will determine diaphragm nailing density and
cut-off requirements for various diaphragm shear capacities.
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