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body--uriencoded--$$ \normalsize \text %7B(a) When%7D \quad \frac%7BP_r%7D%7BP_c%7D \geq 0.2 \\ & \frac%7BP_r%7D%7BP_c%7D + \frac%7B8%7D%7B9%7D \left ( \frac%7BM_%7Brx%7D%7D%7BM_%7Bcx%7D%7D + \frac%7BM_%7Bry%7D%7D%7BM_%7Bcy%7D%7D \right) \leq 1.0 & \qquad \qquad \qquad (H1.1a) \\ \text %7B(b) When%7D \quad \frac%7BP_r%7D%7BP_c%7D < 0.2 \\ & \frac%7BP_r%7D%7B2P_c%7D + \left ( \frac%7BM_%7Brx%7D%7D%7BM_%7Bcx%7D%7D + \frac%7BM_%7Bry%7D%7D%7BM_%7Bcy%7D%7D \right) \leq 1.0 & \qquad \qquad \qquad (H1.1b) $$

Where

Pr : = required axial strength using LRFD or ASD load combinations, kips(N)
Pc : = available axial strength, kips(N)
Mr : = required flexural strength using LRFD or ASD load combinations, kips-in.
Mc : = available flexural strength, kips-in. (N-mm)
x : = subscript relating symbol to strong axis bending
y : = subscript relating symbol to weak axis bending

For design according to Section B3.3 (LRFD):

Pr = required axial strength using LRFD load combinations, kips (N)
Pc = ɸcPn = design axial strength, determined in accordance with Chapter E, kips (N)
Mr = required flexural strength using LRFD load combinations, kip-in. (N-mm)
Mc = ɸbMn = design flexural strength, determined in accordance with Chapter F, kip-in. (N-mm)
ɸc = resistance factor for compression = 0.90
ɸb = resistance factor for flexure = 0.90

For design according to Section B3.4 (ASD):

Pr = required axial strength using ASD load combinations, kips (N)
Pc = Pn/Ωc = allowable axial strength, determined in accordance with Chapter E, kips (N)
Mr = required flexural strength using ASDload combinations, kip-in. (N-mm)
Mc = Mn/Ωb = allowable flexural strength, determined in accordance with Chapter F, kip-in (N-mm)
Ωc = safety factor for compression = 1.67
Ωb = safety factor for flexure = 1.67

TS EN 1991-1-3

6.2.9 Bending and axial force

(4) Members which are subjected to combined bending and axial compression should satisfy: