CALCS PROC032
LATTICED COLUMNS, STABILITY

NOTATION

K1Modulus Factor-diagonals only
K2Modulus Factor-diagonals & transversals
Acsa, single diagonal bar, diagonals only arrgt
A2csa, diagonal & transverse bars, diag&trans argt
I2nd mom of area, in plane normal to chords plane
Llength, column
thetaangle, brace orientation from chords

APPLICATION

used in

OUTPUT

Stability critical stress correction factor based on transverse shear stiffness

SEE ALSO

PROC015 PROC040

THEORY

Roark5, Page430

GUIDANCE

guidance notes

INPUT FORMAT

LET Nm=:Nk=:A=:A1=:A2=:I=:L=:theta=RAD():PROC032

EXAMPLE

Call Statement

LET Nm=1:Nk=1:A=10.4:A1=7.6:A2=5.7:I=2037:L=97:theta=30:PROC032

Output

PROC032 STABILITY, LATTICE COLUMN, Rev 021095
K1= 1/(1+4.93*I/(A*L^2*(COS(theta))^2*SIN(theta)))= -0.2971
K2= 1/(1+4.93*I/(A1*L^2*(COS(theta))^2*SIN(theta))+4.93*I/(A2*L^2*TAN(theta)))= -0.1999
END032