D11.A.4.4 Compression
The compressive strength of members is based on limit states per NZS3404 Section 6. It is taken as the lesser of nominal section capacity and nominal member capacity.
D11.A.4.4.1Compression Section Strength
Nominal section capacity, φNs , is a function of form factor (Cl.6.2.2), net area of the cross section, and yield stress of the material. Through the use of the NSC parameter, you may specify the net section area. Note that this parameter is different from that corresponding to tension. The program automatically calculates the form factor. The
The NSC
(net section factor for compression) design parameter is used for compression sectoin strength checks.
D11.A.4.4.2Compression Bending Strength
Nominal member capacity, φNc
, is a function of nominal section capacity and member slenderness reduction factor (Cl.6.3.3). This value is calculated about both principal x and y axes. Here, you are required to supply the value of αb
(Cl.6.3.3) through the ALB
parameter. The effective length for the calculation of compressive strength may be provided through the use of the parameters KY
, KZ
, LY
, and LZ
.
The PBCRES
and LHT
design parameters are also used for this check.